Malicious PDF — malware analysis report

Static analysis result for SHA-256 760840099b52c6b8…

MALICIOUS

PDF

92.7 KB Created: 2021-09-19 05:14:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 054b9df63dc03eefe475a29cfcb36427 SHA-1: 4ed1e076bb1715a7c29fc64a59d5ee8725817c19 SHA-256: 760840099b52c6b86de51e2f12f58ef2f44ec98baf509d2819729d6a92abea91
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly support its malicious nature, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9938

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 http://kiavysocina.cz/UserFiles/File/sidofi.pdf In PDF document text
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142c10491eaf---nivuxumuxobojazasalawerew.pdfIn PDF document text
    • http://osayit.com/images/file/romipurepamedimaboz.pdfIn PDF document text
    • https://sdhouse.info/ckfinder/userfiles/files/filidon.pdfIn PDF document text
    • http://ototavandosemesi.com/resimler/file/nowazasekofasiwikogo.pdfIn PDF document text
    • http://medeeatour.ro/mm/file/77102404848.pdfIn PDF document text
    • https://priscar.com/documents/files/8216342310.pdfIn PDF document text
    • http://agecarekorea.com/ckupload/files/36670318157.pdfIn PDF document text
    • https://soudureornementalelauziere.com/upload/editor/file/10054577039.pdfIn PDF document text
    • https://bruceleevideos.org/images/file/nojufolaxuwe.pdfIn PDF document text
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132dd76d97d9---97697043985.pdfIn PDF document text
    • https://thefencedocumentary.ca/adminfiles/file/donaz.pdfIn PDF document text
    • https://razredna-nastava.net/files/moxosafitekezigur.pdfIn PDF document text
    • http://www.urbanwaterways.info/files/82777785829.pdfIn PDF document text
    • http://alt-1c.ru/userfiles/file/tesuzeresurolo.pdfIn PDF document text
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/161404a3eb07e7---83127535910.pdfIn PDF document text
    • https://halkapsikoloji.com/userfiles/file/fezaponekekepunuga.pdfIn PDF document text
    • http://broadgatecapital.com/userfiles/file/94656753966.pdfIn PDF document text
    • http://lasantitosrestaurant.com/userfiles/file/84854933174.pdfIn PDF document text
    • http://maroba-zirndorf.de/file/ronebusevutovove.pdfIn PDF document text
    • https://daaeportrett.no/upload/file/zegifitulino.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=play+store+de+androidPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dee0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEE0 16460 bytes
SHA-256: 2ac12e769835c9f929a0ab5cc330003ddd2e8c24216406c99567036885c3dc00
font_01_sfnt_off0000f5c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5C0 10356 bytes
SHA-256: 079db41abf7bed8730d3948c6cd0fbb5841a0604f0786a78fde6a4694721e613
font_02_sfnt_off00010d50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D50 1828 bytes
SHA-256: c65da4501f80be219574418733c77cb401adeeba023536fee640a710fe7be6ed
font_03_sfnt_off000115e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115E5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_04_sfnt_off00012df7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DF7 21440 bytes
SHA-256: e00479f2bfd072bf6724ad85fbf34cc80f57d62f5a1637513bbe7e023e68c629

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