Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9deb4f1642d9870…

MALICIOUS

PDF

140.5 KB Created: 2021-06-25 20:26:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d161406d9eb4bd04bcc74348cad32bf0 SHA-1: dcf271c46d7d0ba7ac1d87596c2dbd32242cc382 SHA-256: b9deb4f1642d9870465f303da1284bb3a8f371a24646579da3cfbff703bcb1eb
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous external URIs and links pointing to compromised WordPress uploads and disposable hosting, indicating it functions as a link farm. The primary purpose appears to be directing users to malicious websites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9875

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://laborke.ru/uplcv?utm_term=series+aiding+inductance
    • http://tnslib.su/userfiles/files/metapalixifoxemamileseb.pdf
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/cad0fade562b1b92e515e206723de7a3/vojopemizaro.pdf
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/1606d47bd3ee95---vopasomobudebutominurug.pdf
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/b073a3dc633aeec5d9c5b7c754442b58/tuwaxakivetetomaked.pdf
    • http://optimus.org.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607776eb3d7e2---38953493214.pdf
    • http://niszczeniewaw.pl/userfiles/file/15664236617.pdf
    • http://amblesidewindermere.ca/fckuploads/images/file/vemidoto.pdf
    • http://herodumpsterrental.com/wp-content/plugins/super-forms/uploads/php/files/a6bad70ab886bdd2925d63281d12ad7b/towawozaviregitemepebako.pdf
    • https://bikinibody.be/wp-content/plugins/super-forms/uploads/php/files/3s00rbca5glknimac1m7h03av8/48425021725.pdf
    • http://mdbim.pl/ubezpiecz/obrazy/file/sibonobufodaxalibifi.pdf
    • http://www.julitolaschools.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b77e9c1bf4---detezu.pdf
    • http://placc.info/up_image/45445391470.pdf
    • https://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/1e4805c9a55eaf401962a7b637d3305a/lenezesanidak.pdf
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074c27a753e1---9213009633.pdf
    • http://elmiraclassiccountry.com/wp-content/plugins/super-forms/uploads/php/files/6076gbe1lcqd9gha057r7hor72/sezaberewuler.pdf
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607e6f8768827---11461420663.pdf
    • http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/75a7491bf361a1d485108edcb527c311/wodeleretelunibow.pdf
    • http://timandlor.com/userfiles/file/lekirijidakelisexunedewi.pdf
    • https://elektrona.cz/files/file/30017585218.pdf
    • http://aydinservis.com/ckfinder/userfiles/files/mudujexig.pdf
    • http://crystalsteakandstogie.com/clients/1/1d/1dbb6d5698303b6304ae84622e226a19/File/21811798843.pdf
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001aeb9.bin
505f1f16fb057e2a34e7666bb0a43a50f2e0b7bc0033e59b70183295ac12d2e9
pdf-font-stream PDF embedded font (sfnt) at offset 0x1AEB9 16100 bytes
font_01_sfnt_off0001c3f1.bin
3423949d7292251a63cfe0a34ede30f3f30311015503cb07c3eeed3f990cebbb
pdf-font-stream PDF embedded font (sfnt) at offset 0x1C3F1 18164 bytes
font_02_sfnt_off0001f415.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1F415 16792 bytes
font_03_sfnt_off00020c2c.bin
3b53d4d71fe8a28a8b9b45e4301060c9fd862d7ba08850b7c855986da02663cb
pdf-font-stream PDF embedded font (sfnt) at offset 0x20C2C 10556 bytes