Malicious PDF — malware analysis report

Static analysis result for SHA-256 24bb725bb57518aa…

MALICIOUS

PDF

157.4 KB Created: 2021-06-26 17:47:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: e0008e47c498dfa7570f274fcfa9be99 SHA-1: 5fd333e7cf441920687a361f23c69945c49b6fa3 SHA-256: 24bb725bb57518aa9c95384240aadf0d26888e33ac27b70416c36dbccbfeb9d2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan-like behavior. It contains numerous links, many pointing to compromised WordPress upload directories, suggesting an attempt to distribute further malicious content or phish users. The document body is heavily obfuscated and does not provide clear textual content, but the heuristics strongly suggest a malicious link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9209

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/f3c1f96789b7271c7965e0d8bf316c5d/nutibas.pdf In PDF document text
    • https://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/160d20c683adcc---85368206046.pdfIn PDF document text
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b13783e8fba---20333243670.pdfIn PDF document text
    • http://bertrandetgastineaudesigners.com/userfiles/file/bafugevutogotukezikisox.pdfIn PDF document text
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c682cce6aa1---xalilisasajedu.pdfIn PDF document text
    • https://lifesmart.ro/ckfinder/userfiles/files/16518353059.pdfIn PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/160b477565e085---ripavatikiwiluwevowuf.pdfIn PDF document text
    • https://law.myvzl.com/wp-content/plugins/super-forms/uploads/php/files/aa61reg0bdns94nsvmruf956km/79195323458.pdfIn PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608befd2e6ea8---ruxaxutuvareba.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/199648fb031d8eea5a96d0ebb9a6a412/80809748165.pdfIn PDF document text
    • https://cmflower-kkc.com/ckfinder/userfiles/files/teruwegobukipijupidina.pdfIn PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5d4880a658---1927924554.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160d70037ebb46---66697533318.pdfIn PDF document text
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/d5a3c705ec7686f527e6cb039a5e0de5/78452855559.pdfIn PDF document text
    • http://jinohair.com/upload/files/lubawanubekulizuzusuju.pdfIn PDF document text
    • http://www.deco-interieure.com/userfiles/file/11393782942.pdfIn PDF document text
    • https://www.kadeavenue.com/wp-content/plugins/super-forms/uploads/php/files/6c6e89b6cbb588c3b0e95ab26c3721ea/zexumagepalokibukoxesa.pdfIn PDF document text
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab94aacfc43---45663238248.pdfIn PDF document text
    • http://ekotop.eu/userfiles/file/xuwagasudoxodosuv.pdfIn PDF document text
    • http://grupogmec.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f8973af6bb---lusodenesiwozogifi.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/16085bc54461aa---pefafipavosorafinakure.pdfIn PDF document text
    • https://allianztc.ro/files/file/sigimokugukukamivuge.pdfIn PDF document text
    • http://fixafilm.se/userfiles/file/dixosugidosuvej.pdfIn PDF document text
    • https://refour.dk/wp-content/plugins/super-forms/uploads/php/files/3cb3f65c28da5271b4617cc5d97e4091/dagexinanomodaxoxip.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=double+smiley+face+meaningPDF link annotation
    • http://e1pl2.nazwa.pl/busy/fotki/file/43628175012.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 6

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011c1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C1F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00013430.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13430 82080 bytes
SHA-256: 2154a2bd94a2d173790467a8fee58dc964658ce613612a33e1c55a0470ed53be
font_02_sfnt_off0001d25c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D25C 10836 bytes
SHA-256: e1899e06cdab57697c99c9d77a2424f572ff4cb9c1d646de6c724641ef29516c
font_03_sfnt_off0001eb5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1EB5A 7472 bytes
SHA-256: 492b2cb08efa4b730599706ddccb632e81bfed33d9f6c91e23c46eab5a9fbd97
font_04_sfnt_off0002060b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2060B 8952 bytes
SHA-256: 084aba20f45b3af06b7ac479f9c47f2f4f04d28e681e3ec8c8cf5ce34a72f99a
font_05_sfnt_off00021866.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x21866 27836 bytes
SHA-256: bf0d18e01c7316459f9cac6ad710a63fb9a0cb0082dcad403c0ca5d0d73cda02

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