Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb64efc60af94317…

MALICIOUS

PDF

97.3 KB Created: 2021-06-25 23:23:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ba0fae992bf12c51492a522642f66baa SHA-1: d7d754b0d62dc9207f50589c2683bc8e7c5dc245 SHA-256: cb64efc60af94317135e46e4078ed9e3476334bc11564fc5c927b14001baa23f
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery. No scripts were extracted, but the PDF structure itself is used to host and distribute links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://profipreklady.cz/www/ckfinder/userfiles/files/36986542370.pdf
    • https://wentworthre.com/wp-content/plugins/super-forms/uploads/php/files/c8d2c69529470fe3dd0e11fb9c331163/99164157348.pdf
    • https://ambulatorioveterinariosismondi.eu/file/93525159702.pdf
    • https://numberonerevolution.it/file/31188802388.pdf
    • https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/a8bcde69047e234e4e18d1e9d8f1aa6a/13963862673.pdf
    • http://www.primalegal.eu/wp-content/plugins/super-forms/uploads/php/files/71hbt9iu4q6effc351jnkno3n3/58159160640.pdf
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16071eaf8e54b3---tekigakamimudemafaj.pdf
    • https://coluer.ir/documents/file/80467364578.pdf
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb4b1963502---fokawezuwovobago.pdf
    • http://flexa.cz/docs/file/57146541903.pdf
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/1608ce0c918d51---zopifuvis.pdf
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c4e248386a5---22429956454.pdf
    • http://www.justgiveahand.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608e7573cb010---38065116846.pdf
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/tvrksogtaicdak9et1ilsd5dm6/59358229125.pdf
    • http://aweibel.com/Photo/file/vikaveve.pdf
    • http://phannhan.vn/files/usersfiles/files/fitot.pdf
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c4d47a2cf7---61251217362.pdf
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090590dabeda---gotukewosimoxaxirisufoz.pdf
    • http://n2nlah.org/UserFiles/file/956108757.pdf
    • https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b0d7978b561---23216221491.pdf
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/97c5cda6d9d1cfb3341dabdb606e49dd/seratiliseritugipilokodus.pdf
    • http://greece-ex.com/images/blog//file/97010120134.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=personification+in+i+know+why+the+caged+bird+sings
    • 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_off000115d6.bin
16097a413c65eaae0952488b31100047540aa30b48fc46b332c77e1164d4083e
pdf-font-stream PDF embedded font (sfnt) at offset 0x115D6 11144 bytes
font_01_sfnt_off00012fbf.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12FBF 16792 bytes
font_02_sfnt_off000147d1.bin
f3ef1147a3901233fa78bc8491cba7cdddb5d6f0e9772b52a6f457bd55da72fe
pdf-font-stream PDF embedded font (sfnt) at offset 0x147D1 18264 bytes