Malicious PDF — malware analysis report

Static analysis result for SHA-256 d91e9a5efc816f73…

MALICIOUS

PDF

174.2 KB Created: 2021-06-26 20:45:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a77fee8e5da3feae711558ea65bbcab5 SHA-1: 471c9aac7885dce0fa1e2dc1315b93e52b40a61d SHA-256: d91e9a5efc816f733dd18fb40095c0c4ffa061f41116117f54052278a8aa1237
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised CMS upload storage, indicating a link farm designed to obscure the final destination. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of techniques used to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9904

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://lightsourceindiana.com/wp-content/plugins/super-forms/uploads/php/files/955e1a8715e1a15099c7606ec2c045bc/kekusulebup.pdf
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080f47d8c9fd---dimezos.pdf
    • http://iwish-cosmetics.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091989e9e952---26272578924.pdf
    • http://change-sexy.com/files/files/96634939289.pdf
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160c7479a641bf---dorofutasadir.pdf
    • http://lyzjkgm.com/d/files/79237467580.pdf
    • http://permanentnimakeup-brno.cz/userfiles/files/nisoneju.pdf
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fc7ed62736---rowigiza.pdf
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160a381be76fc8---55453588541.pdf
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/qm2barklfc3dr86rb0mce1gs87/94757250892.pdf
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/02vttokhr89hosltgt8h07s1o1/bopimixixipaj.pdf
    • https://kodeac.com/wp-content/plugins/super-forms/uploads/php/files/obkbfun9m58l3aas8c9pqvo36c/95614323281.pdf
    • https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/3179cb803e9a020be3957fe50f7b8e4e/mufasaxijetufemoloxure.pdf
    • https://securitegenerale.tn/userfiles/file/zabumupaseguxarap.pdf
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ae0eaa0c783---12044177689.pdf
    • http://arch-teh.com/pic/userfile/32715248408.pdf
    • http://phillipwhiting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bebebf38a1d---zutulitenuzoka.pdf
    • https://addsfly.com/userfiles/file/21496275839.pdf
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bea32d7d4e8---71994633019.pdf
    • https://deedpoll.sg/wp-content/plugins/super-forms/uploads/php/files/069ddacd4335eddb1fa77260c8ba24ac/bigojuvukidexidugowov.pdf
    • http://ljhalls.com/wp-content/plugins/super-forms/uploads/php/files/95dd2ff0788de253d7f2d04b06abc284/lovero.pdf
    • https://invest.pl/userfiles/file/16834114821.pdf
    • https://jajugroup.com/ckfinder/userfiles/files/vipesokiv.pdf
    • https://geneticapanama.com/userfiles/file/10735291466.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=against+sexual+harassment
    • 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_off00024c02.bin
d06fc74ce7fa0926a2559f8e9dc8cac637c14989d5c19e62856ed3769963f5a8
pdf-font-stream PDF embedded font (sfnt) at offset 0x24C02 17360 bytes
font_01_sfnt_off0002796d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x2796D 16792 bytes
font_02_sfnt_off00029184.bin
0f1bedda28944830ffde2e3d1be18f780e3058b330a77d436fabd9de8ee8a076
pdf-font-stream PDF embedded font (sfnt) at offset 0x29184 10620 bytes