Malicious PDF — malware analysis report

Static analysis result for SHA-256 3deadddd228dc808…

MALICIOUS

PDF

77.5 KB Created: 2021-09-07 00:47:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 57aed6555219642fcc78b681cca10a66 SHA-1: 2566e38c63c59ff585890d341f05a6da7b49afd5 SHA-256: 3deadddd228dc8083d797f2de3c95bbde8b13edff5252835be0cb73bf4c61928
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a link farm directing users to numerous external URLs, several of which are hosted on compromised CMS platforms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, and the document body was unreadable, but the heuristic findings are sufficient to assess the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://austarpharma.com/upload/files/rezuzetesugizul.pdf In PDF document text
    • http://autoshiftbid.com/fckeditor/userfiles/file/vasuzopopexepunenamulox.pdfIn PDF document text
    • http://purpledoorchurch.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086bc7b80a26---dediguk.pdfIn PDF document text
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16096854b3caea---9642072014.pdfIn PDF document text
    • https://markaoyun.com/calisma2/files/uploads/53748958183.pdfIn PDF document text
    • http://www.yoko-ono.be/images/userfiles/file/25323213930.pdfIn PDF document text
    • https://dacinsara.ro/fckfiles/file/ratap.pdfIn PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b418775f8a5---lenewek.pdfIn PDF document text
    • https://primewestelectrical.com/wp-content/plugins/super-forms/uploads/php/files/d47740208e2eaf2be6f318c2697c6e92/15820149934.pdfIn PDF document text
    • https://boyanbolyarski.com/userfiles/file/vafili.pdfIn PDF document text
    • http://dunajecbiala.pl/upload/File/zawelalonafazaji.pdfIn PDF document text
    • http://onlinepravenconsultant.com/uploads/wysiwyg/files/dudewi.pdfIn PDF document text
    • https://vernadoc.com/wp-content/plugins/super-forms/uploads/php/files/ea21fbd4afa827744347ade45551673f/tadup.pdfIn PDF document text
    • https://www.corridar.com/wp-content/plugins/super-forms/uploads/php/files/9keilauj02vg69akfs7c8p0b2v/rogarijavelodukurota.pdfIn PDF document text
    • http://geyikkimya.com/userfiles/upload/file/menuvuderudijipe.pdfIn PDF document text
    • http://sxsasa.org/images_fck/file/1627690550.pdfIn PDF document text
    • http://ash-graphy.com/userfiles/file/62336000896.pdfIn PDF document text
    • http://preprod.app-nomads.com/ugecam/admin/ckfinder/userfiles/files/35506774722.pdfIn PDF document text
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/tj9rqk8f4in06ju5ats9fvfrl2/58534533609.pdfIn PDF document text
    • https://shoreluxurylimos.com/userfiles/files/xasokejeduxusikuw.pdfIn PDF document text
    • https://m3csrl.com/file/gatexesa.pdfIn PDF document text
    • http://jedzenie365.pl/ckfinder/userfiles/files/45578104940.pdfIn PDF document text
    • http://rmgoals.com/userfiles/files/kudizusoputunusanupone.pdfIn PDF document text
    • http://cukiernia.eu/upload/files/momofidagufejesita.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/4f3897582975a85c12b6a852e07c7fa1/nupol.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=printable+calendar+2018+free+pdfPDF link annotation
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c9f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9F7 10968 bytes
SHA-256: 184397f7a8a24ca72c170172413e84e0295b1963011811fbac19104bcb9297c5
font_01_sfnt_off0000e361.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE361 17580 bytes
SHA-256: 38d3d17e9601604241eb9628744f37b71776ab8d9836617249003cff8db22151
font_02_sfnt_off00011076.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11076 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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