Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5710f71388ea256…

MALICIOUS

PDF

85.3 KB Created: 2021-07-04 11:04:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 783d826b302f1cc0a30330b8f817bf52 SHA-1: e2ac653df5851b4ee1957d91dcf17ff9ed20d790 SHA-256: a5710f71388ea256c2607355c135716e31efe5bf79f8d7271cd8a3710340288a
176 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as a link farm, with many URLs pointing to compromised WordPress installations. The ML classifier and ClamAV also identified it as malicious, specifically a phishing trojan. The embedded URLs are designed to lure users into clicking on links that lead to potentially harmful content or further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/rueluo5o9uianlh0dkdcqokki6/famuzonawulimatawos.pdf
    • http://faw-asia.com/image/upload/files/depisas.pdf
    • https://www.nexidia.it/wp-content/plugins/super-forms/uploads/php/files/71ec50ad21fca9405c0b5083b50f7fde/66490783262.pdf
    • http://aire-limpio.com/img/editor/file/57417457615.pdf
    • http://birnagarcollege.in/userfiles/file/ranilobura.pdf
    • https://www.mnspineandsport.com/wp-content/plugins/super-forms/uploads/php/files/9103d93208d8566488c33a69fae06d48/bisaxagujevavurepabarova.pdf
    • http://cualuoiskydoor.com/webroot/img/files/63284154856.pdf
    • http://bioscipublisher.com/files/upfiles/file/18757398066.pdf
    • http://atenngo.com/admin/sites/site/documents/lanifuwemizapijejerapeli.pdf
    • http://exima.kr/userData/board/file/12185758526.pdf
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a31fd63863f---zejisumumobad.pdf
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/e53li59k2qjh4l2e9aogcqa0b0/bosoborejaruponemitune.pdf
    • http://pinturasoltra.com/images/slider/files/30815965217.pdf
    • https://k9-warrior.com/wp-content/plugins/super-forms/uploads/php/files/vlg8vv3jo2rc9nr2fb7euq6per/76073247249.pdf
    • https://sardavetri.it/userfiles/file/63971388274.pdf
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/16070482d4a57b---2755692600.pdf
    • http://benthanhsgfarm.net/images/uploads/files/66714016916.pdf
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/gt8d93fuq0qbsr1ak0t6rujt8k/wukodovadijokam.pdf
    • http://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079adfd046f5---61646119261.pdf
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/160702222af79a---kimobetadojilivorurokume.pdf
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/1f7cd242f68693c893024111e5b50e46/koxebubolewetuderexog.pdf
    • http://www.advancedevents.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16079ca71307aa---51781428315.pdf
    • http://computerdoki.hu/user/file/41976258440.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=three+letter+words+ending+with+ab
    • 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_off0000e78c.bin
ea081846b0ffdaa71f4dfcac2d70e8a9da35414858edda0d66febb839c45b306
pdf-font-stream PDF embedded font (sfnt) at offset 0xE78C 18308 bytes
font_01_sfnt_off0001177c.bin
e85b44a9fad90cf9c692caa6c0131049fec9447448134047543a12a0dcc8aa59
pdf-font-stream PDF embedded font (sfnt) at offset 0x1177C 10716 bytes
font_02_sfnt_off00012fe1.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12FE1 16792 bytes