Malicious PDF — malware analysis report

Static analysis result for SHA-256 840b36f034349966…

MALICIOUS

PDF

70.9 KB Created: 2021-10-01 05:58:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: dba968f80cd5729a88450e63a2f17433 SHA-1: b366729aa1e3476ca24afc132327c6727bdf9c4b SHA-256: 840b36f034349966cad20e121dec1651adf69c8f6c06ecb667db07f2ead5a2c2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to compromised CMS upload directories, suggesting it functions as a link farm. The presence of 'utm_term' in one URL further supports a phishing or spamming campaign. No scripts were extracted, but the overall structure and URL distribution are indicative of a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://pixomot.ru/uplcv?utm_term=racing+horizon+unlimited+race+mod+apk PDF link annotation
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16140f7b3d2590---66949303629.pdfIn PDF document text
    • https://www.beewellrx.com/wp-content/plugins/super-forms/uploads/php/files/tmp/53215016298.pdfIn PDF document text
    • https://aradovan.com/userfiles/file/61488285543.pdfIn PDF document text
    • http://heorungminhphat.com/luutru/files/98259658852.pdfIn PDF document text
    • http://nhahanghienminh68.com/upload/files/zedujirazitimimoxu.pdfIn PDF document text
    • https://clove7.com/userfiles/file/11875783264.pdfIn PDF document text
    • https://xpress2.eu/ckfinder/userfiles/files/69993551482.pdfIn PDF document text
    • http://solemarservizi.it/userfiles/files/94032198643.pdfIn PDF document text
    • http://longbeach.ilovepokebar.com/uploads/files/70620060432.pdfIn PDF document text
    • http://spartaksedlec.cz/spartaksedlec/userfiles/file/83724621215.pdfIn PDF document text
    • https://www.sterlingsez.com/ckfinder/userfiles/files/digagojesuxiwifaj.pdfIn PDF document text
    • http://wo-kop.pl/userfiles/file/17020122226.pdfIn PDF document text
    • https://minipowerpack.net/upload/files/40167824165.pdfIn PDF document text
    • http://lex.tj/img/file/bumonurijila.pdfIn PDF document text
    • https://franciscovalles.comtraining.cl/userfiles/files/nufaxirodo.pdfIn PDF document text
    • http://dreesmann-foto.de/userfiles/file/nuvunolulokefarakeboko.pdfIn PDF document text
    • https://atcotourismtravel.com/userfiles/file/zujipexa.pdfIn PDF document text
    • http://kimandyoo.com/userfiles/file/32948473087.pdfIn PDF document text
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/161345f083ac98---vorujewazogaxipazowivawa.pdfIn PDF document text
    • https://jv-cms.crazy-jessie.nl/uploads/files/28426845191.pdfIn PDF document text
    • https://karinbentum.nl/uploads/file/zumipatatagemudinitida.pdfIn PDF document text
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e71cd7ba39---witojuva.pdfIn PDF document text
    • https://tourpon.kr/FileData/ckfinder/files/20210905_9896357F03DC62E9.pdfIn PDF document text
    • http://ecohost.ru/pics/images/file/63016034192.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_off0000b306.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB306 16120 bytes
SHA-256: e283ef82346805bf660fcf98f79584bdc9364897233a53622af32d841f3afd68
font_01_sfnt_off0000dc50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC50 11092 bytes
SHA-256: e28c8030adba2d83620def8a6d6d8ef77b831ba34a269069ee252ba51c874e26
font_02_sfnt_off0000f5ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5CE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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