Malicious PDF — malware analysis report

Static analysis result for SHA-256 436310d4d6ba34ab…

MALICIOUS

PDF

90.6 KB Created: 2021-08-06 19:52:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: f5686e57ac7575bc40651eb4f22465db SHA-1: b2ac6762d14dbd960a34dceb90d53b053956b10b SHA-256: 436310d4d6ba34ab7e3393592d0d5a24b266f671dd51304800c4881a8c7b061f
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress upload directories and other potentially malicious domains, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The presence of multiple external URI heuristics further supports the conclusion that the document is designed to redirect users to external, potentially harmful, content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://spherule.org/wp-content/plugins/super-forms/uploads/php/files/53512bb4a72126568b6358a07d46bf65/vovaketotusibuvaworete.pdf In PDF document text
    • http://crisismobile.com/ckfinder/userfiles/files/kivubadewedezotebe.pdfIn PDF document text
    • http://aps-mes.com/files/file/jagonavefetizolubewavaw.pdfIn PDF document text
    • http://andlupa.com/userfiles/file/tesepejukapekiw.pdfIn PDF document text
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/160ad9e13724bf---87513178310.pdfIn PDF document text
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d34da477b7b---tedugus.pdfIn PDF document text
    • http://allprintusa.com/admin/images/file/gupalone.pdfIn PDF document text
    • http://alcantara.cz/data/file/fowasebobibowizowos.pdfIn PDF document text
    • https://landlorddebtadvisory.com/wp-content/plugins/super-forms/uploads/php/files/rcbjla6fvh4d3ti80dbqupj9n4/vulixepowog.pdfIn PDF document text
    • https://churchofgodinjamaica.org/app/webroot/files/28290045029.pdfIn PDF document text
    • https://heritagecambodiatravel.com/userfiles/file/82947926382.pdfIn PDF document text
    • https://prospr.fr/ckfinder/userfiles/files/sawogifiburumiravir.pdfIn PDF document text
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608269ae6bdb7---biranogebuzobinelo.pdfIn PDF document text
    • http://phelieuviethung.vn/upload/files/zofurugivavotu.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/1dfd8a2492fab6a61aa7e1332233de8f/24272638291.pdfIn PDF document text
    • https://ontime-taxi.kg/wp-content/plugins/super-forms/uploads/php/files/31ab252bd9269cc53f720de7f23ba774/6511205749.pdfIn PDF document text
    • https://graffitipaintstudio.com/wp-content/plugins/super-forms/uploads/php/files/ed4b9f6d03b14beecc316d9efd1fdd40/kexus.pdfIn PDF document text
    • https://www.msolartop.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160962d16a29e0---fakubefazurokogo.pdfIn PDF document text
    • http://casavacanzesanvito.eu/userfiles/files/zawuxofesegojaxuza.pdfIn PDF document text
    • https://www.stjohnhomelessshelter.org/wp-content/plugins/super-forms/uploads/php/files/0711c1eacd3ed42fea55e6af2fd37273/71272184808.pdfIn PDF document text
    • http://gibisch.org/files/files/xasutupugogegefime.pdfIn PDF document text
    • http://mattstergamer.com/wp-content/plugins/super-forms/uploads/php/files/3eg0osulb1eev2n0ge04h9maqt/gevelene.pdfIn PDF document text
    • http://thaihotelsale.com/FileData/ckfinder/files/20210801_A4C0763049B76DAD.pdfIn PDF document text
    • http://crm333.com/documentos/file/32981007910.pdfIn PDF document text
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e2788fd5e90---kemuboriripag.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=the+bodybuilder%27s+kitchen+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_off0000fae0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAE0 17516 bytes
SHA-256: 5dce2f15c66855e62e3bc35b19deb956afc45db6f51039b7f34302eeda66c7f6
font_01_sfnt_off000128d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128D1 10996 bytes
SHA-256: f1f04b8271f2136698bf230e9ad04ec977fb5141ba2778626c270dffd6f40329
font_02_sfnt_off00014227.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14227 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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