Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f7d35a2ae08d415…

MALICIOUS

PDF

74.0 KB Created: 2021-07-02 08:46:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 370a771f4d0579dfdc80841d65dd5ad2 SHA-1: e57087181a696805599be543b72707134f81e5dc SHA-256: 3f7d35a2ae08d415f827e2a8c69980c2ce5b19dd33fad5dd9beb327a655679eb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple compromised WordPress upload directories, indicating an attempt to host malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document delivery mechanisms.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://maxim-catering.de/wp-content/plugins/super-forms/uploads/php/files/qv8dmh3e8l1qnqk3n9gfl2lstp/belinizarewoxemaninolapoz.pdf
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607bb78f8949e---99077337209.pdf
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b9c4c9aaf9d---48595886810.pdf
    • https://teenvolunteerdallas.org/wp-content/plugins/super-forms/uploads/php/files/3d4a8e294f7bf01fc6ecc5117fc7ea9f/92474712391.pdf
    • https://walkandsmile.com/userfiles/file/10364002530.pdf
    • https://www.sesc.com.ua/wp-content/plugins/super-forms/uploads/php/files/lnr1pne4smv3110v570puvkoj3/muxewezupuwo.pdf
    • http://etasystem.net/userfiles/files/3691595811.pdf
    • http://archerelectricsupply.com/userfiles/file/54155334602.pdf
    • https://interesttour.com/wp-content/plugins/super-forms/uploads/php/files/b94381701ac5e0b5ed379442c7be3046/sagosowajigaralexemalaro.pdf
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b147ac6eff0---43402644973.pdf
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16081f0be89caf---63633817029.pdf
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/epfqcp4s14u7g3b0pf51094dfc/25219351140.pdf
    • http://shssailors1969.com/clients/3/36/366f78b21138e0f8005dfe6cc5e09e30/File/83503527525.pdf
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/1609fb4bfebe2f---tolijojeloselilekuwis.pdf
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160b4752145f67---busirenoxox.pdf
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a64b209ef9b---beneraruwupesujilabido.pdf
    • https://www.kngroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a279ed2ce8e---62897817328.pdf
    • https://www.justgym.co.za/wp-content/plugins/super-forms/uploads/php/files/s947m6egvgnmrsmtvmerlu1a67/82924372175.pdf
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/160909aa8a9173---tuzigaretubaviluw.pdf
    • https://socialacademy.gr/wp-content/plugins/super-forms/uploads/php/files/fe4c23d72ea58f5af70b8df7ab6ccfb8/91750763599.pdf
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16095619db8d02---fizaxinojogikirufifesog.pdf
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070bea30e8b2---tedobazagimol.pdf
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b12853878ae---25481622299.pdf
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/16082e502b95f9---ruwagiwarikezewekuraj.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=how+many+years+of+college+do+you+need
    • 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_off0000c01c.bin
b99c799191d5e04c0923e5702e2ae429dc5f01bc8ea3c6ff800830e6d2006bf6
pdf-font-stream PDF embedded font (sfnt) at offset 0xC01C 16020 bytes
font_01_sfnt_off0000e954.bin
eaecf75684e9dcfdd7f20fcf12c49f23e7623c0a9bd40cc7ca6edcd258301970
pdf-font-stream PDF embedded font (sfnt) at offset 0xE954 10920 bytes
font_02_sfnt_off00010278.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10278 16792 bytes