Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6aa87cf9a05aced…

MALICIOUS

PDF

95.2 KB Created: 2021-07-15 20:04:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: fffd4ea190aa4cd293b752dcf86b9ca3 SHA-1: 5cd02cebb9010267cca00dc89f640662abd04ca0 SHA-256: f6aa87cf9a05acedaa0a6f177a38f41da5644caf2bef147b645e2982b1d76a5c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised WordPress installations or disposable domains, indicating a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the heuristics point towards a phishing lure, likely attempting to trick users into downloading further malicious content or submitting credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9820

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://medvor.ru/uplcv?utm_term=world+famous+lover+1080p+movie+download
    • https://brianhigbielaw.com/UserFiles/file/38929760682.pdf
    • http://ruoumoc.com/upload/files/36989647371.pdf
    • https://awlights.com/wp-content/plugins/super-forms/uploads/php/files/88ecca3609e4317ab53de47db8b775ec/kigosavegimavugonupuluk.pdf
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/ace31e3113d51377a20b2f50c75fb7ec/88560823729.pdf
    • https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609458dc7e0cb---14804080295.pdf
    • http://ceomit.com/fckupload/file/77975793853.pdf
    • https://autoschiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c45e7d45ba3---titawaru.pdf
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bab0a2b50ca---36338557659.pdf
    • https://www.deuba.info/wp-content/plugins/super-forms/uploads/php/files/3qtbbun68t6fe2q5103p8usep4/liparedopilosogef.pdf
    • https://costumeworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093aaa2c3001---kunavezovabor.pdf
    • http://all4pets.cz/ckfinder/userfiles/files/86021992768.pdf
    • http://www.zopfitravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc628bd907---99280516565.pdf
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/160de805d35802---nuvovufemog.pdf
    • http://joesservicecenternj.com/userfiles/files/56652857953.pdf
    • http://capmar.eu/userfiles/file/21788664265.pdf
    • http://humanlitech.com/files/files/vuwatisikazebupopovol.pdf
    • https://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/cd06b66151a861f1227d92b5fa8cf47f/pemowosovevenilabilabalit.pdf
    • https://www.3dreamchurch.com/wp-content/plugins/super-forms/uploads/php/files/9ea129a6e68acd804e8a0ec25bafa7ac/82317000760.pdf
    • https://incoyun.com/calisma2/files/uploads/pafad.pdf
    • https://ukmalayalamnews.com/userfiles/file/2979199045.pdf
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/2cc832beb0d283926437b24d44ff7f96/lafatemasokidovo.pdf
    • https://discoverapartmentsforrent.com/wp-content/plugins/super-forms/uploads/php/files/a2c895a8f15c99e78f342c829170715d/91280256393.pdf
    • https://sibconsulting.com/contents//files/92772674096.pdf
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160cd4c68e6925---97550054136.pdf
    • https://robotics-institute.com/wp-content/plugins/super-forms/uploads/php/files/n6kf3q2qnr3mm6v6nkb5edpef1/latifepavudobikuji.pdf
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160741edaea137---55141152208.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010f55.bin
4d5ff04e94de1c63c55fab42a6fc89694c367e744fe488394b48f6389c2fc4d8
pdf-font-stream PDF embedded font (sfnt) at offset 0x10F55 11188 bytes
font_01_sfnt_off0001298e.bin
670be9577e4d822dee4dac4a1dc890e5854d80d38beae08b12b6677833124697
pdf-font-stream PDF embedded font (sfnt) at offset 0x1298E 17520 bytes
font_02_sfnt_off00015722.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x15722 16792 bytes