Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e602da89c668e77…

MALICIOUS

PDF

81.0 KB Created: 2021-06-29 04:17:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2ef5ba88487c92b818422d9e41c5f213 SHA-1: af25dd8f185f5ec6232736607c1a9e110676b82e SHA-256: 4e602da89c668e7752a0f033af3861618fe49cc1d5609adf3e6633a374458a4a
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm with multiple URLs pointing to compromised WordPress upload directories, suggesting a tactic to distribute malicious content or redirect users to phishing sites. No scripts were extracted, and the document body was unreadable, limiting further analysis of the specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://workprohealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d7d16438d6---46119701948.pdf
    • https://www.criteriainvest.com.br/wp-content/plugins/super-forms/uploads/php/files/9jrj2rjov019jqe62jn20iii8d/23421055805.pdf
    • https://muratay.nl/userfiles/file/zabozisavaliwixomubakuj.pdf
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/160882429ac203---nejegenes.pdf
    • http://arcadia6465.com/clients/f/fc/fcac8d81e62e7f23ed02b02243def538/File/44860036002.pdf
    • https://vallejardin.com/wp-content/plugins/super-forms/uploads/php/files/72734e7c1be3968e84dd132f30299bc7/55529952516.pdf
    • https://craftsmancuttingdies.com/wp-content/plugins/super-forms/uploads/php/files/ab02dca33900018955572ca241abe474/biguxujizosusugewojaza.pdf
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/1607fc1e1cf48c---66987313654.pdf
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c2f29a87a8---43510713257.pdf
    • http://zs-oilfieldequip.ru/d/files/dojugetoxiseseramulirega.pdf
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098467727cdc---32808163565.pdf
    • http://teusz.pl/UserFiles/file/busemakajevevakubedujimig.pdf
    • https://www.chartsunlimited.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/1609847ea63477---71387899539.pdf
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/kh82evha1j2sbfntj8rs1ufaet/35518834465.pdf
    • https://prosegik.com/wp-content/plugins/super-forms/uploads/php/files/27824506f82c299b0c298e32023171a2/61024838829.pdf
    • http://iburgisidimarsala.eu/userfiles/files/24709773192.pdf
    • http://icsbc.ru/fuploader//file/61863306984.pdf
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160cc41970430d---nalusefikijafolepatepolo.pdf
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/2248ae1f80fd90932c12a8c427c54ec2/wewutefilosusagas.pdf
    • http://harchovyk.com/userfiles/file/lixinuwaginuxaguna.pdf
    • https://www.mysmilestudios.com/wp-content/plugins/super-forms/uploads/php/files/151e1fc958f017728b0471cab0bc70c7/tamesibefufexawe.pdf
    • https://baileyelectrical.services/wp-content/plugins/super-forms/uploads/php/files/udd30sgi0i6al75835b6kqj4na/momosokasozetuzifogagefed.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=heat+of+neutralization+of+naoh+and+hcl
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d20a.bin
c3cc90965be92f117b750ef7dec8f8cb5431addcf871aaaf4113c88675c88c1f
pdf-font-stream PDF embedded font (sfnt) at offset 0xD20A 10556 bytes
font_01_sfnt_off0000e9fb.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE9FB 16792 bytes
font_02_sfnt_off0001020d.bin
db8544ed48da224319ba539bea6153f1b560ba3e8bda1baf70ac0bc2a30fbec7
pdf-font-stream PDF embedded font (sfnt) at offset 0x1020D 19168 bytes