Malicious PDF — malware analysis report

Static analysis result for SHA-256 f33901eb3bf3358a…

MALICIOUS

PDF

83.8 KB Created: 2021-09-12 06:33:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 7d3921d75a58be71061ed0b2816dd526 SHA-1: de15a512f51b298c875b92d2ce5834d067634bc8 SHA-256: f33901eb3bf3358a81052e44eb0ac671615d5a79c3ed31683fbb4d382ff30ba8
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external URLs, many pointing to compromised CMS uploads or disposable hosting, suggesting it functions as a link farm to lure users to malicious sites. While no scripts were explicitly extracted, the presence of external links and the nature of the heuristics indicate a high likelihood of it being used to deliver a secondary payload or facilitate phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://philabc.ru/uplcv?utm_term=nezha+reborn+full+movie+free+online PDF link annotation
    • https://paroles-vives.com/ckfinder/userfiles/files/pulibuketu.pdfIn PDF document text
    • https://renfrewareahealthvillage.ca/ckfinder/userfiles/files/79550188055.pdfIn PDF document text
    • http://yesfabric.com/images/upload/File/98022145751.pdfIn PDF document text
    • https://megacook.pt/site/upload/file/zenibokamufef.pdfIn PDF document text
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b8e03d1fbd---70096616601.pdfIn PDF document text
    • http://etoprosto.ru/ckfinder/userfiles/files/giwujoketebaxun.pdfIn PDF document text
    • http://thucphamchucnangmy.vn/uploads/files/tiwizidi.pdfIn PDF document text
    • http://photopuzzle.net/userData/board/file/togapuminitese.pdfIn PDF document text
    • http://bdsps.org/slbdavbatala/userfiles/file/23661469068.pdfIn PDF document text
    • http://www.tomasjelinek.com/img/pub/file/xubovosumute.pdfIn PDF document text
    • https://triatlonshop.cz/userfiles/file/fofebalofutol.pdfIn PDF document text
    • https://acrgroup.nl/userfiles/file/vogemafisuwudekavagogo.pdfIn PDF document text
    • http://jfhcoaching.nl/userfiles/files/48531174018.pdfIn PDF document text
    • http://skncn.com/u/files/jozejubebaforogabilix.pdfIn PDF document text
    • https://kovrdom.ru/sites/all/sites/default/files/file/18188406520.pdfIn PDF document text
    • http://druckmaschinenservice.com/uploads/fce/files/38105400832.pdfIn PDF document text
    • https://cheesykeju.com/contents/files/gowobu.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613268db66140---redolivozonopilalojew.pdfIn PDF document text
    • http://a-pro-peau.fr/userfiles/file/lizalemugekem.pdfIn PDF document text
    • https://bhiringisamsankalimandir.org/userfiles/file/dopesobogobejanokof.pdfIn PDF document text
    • http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/363fcae88ba4a1a82e133b49e148997f/delor.pdfIn PDF document text
    • http://zamgph.com/uploads/file/050728162894.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135367f6f2b4---54713810842.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000deb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEB8 10556 bytes
SHA-256: 72418f3098aa4157b5687cf99ab1909b192eadcdab206d7c79e78a0ae6d1dca1
font_01_sfnt_off0000f695.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF695 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010ea7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EA7 19212 bytes
SHA-256: 3086dc466731309d4df424a7674a8dd119c1e2eeab8f99349b1bb496b7a946e8

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