Malicious PDF — malware analysis report

Static analysis result for SHA-256 23b2850697054f3a…

MALICIOUS

PDF

89.7 KB Created: 2021-06-28 02:05:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 362e405cc30da555f3142ef874117653 SHA-1: 3acf72f5ae8f6d569b42efe8dadeb9df6c1b1f7a SHA-256: 23b2850697054f3a130f60def0ab990a700bac279c2f3a2542b7d08614735f6e
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

Heuristics 6

  • 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 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 http://scenekunstskolen-efteruddannelsen.dk/ckfinder/userfiles/files/67721445910.pdf
    • http://ecohost.ru/pics/images/file/20871619817.pdf
    • http://kinel-hunter.ru/upfiles/file/93627232968.pdf
    • http://playfromhome.org/clients/4/49/49939bf6a151252ba1adfe53d1befa29/File/rajazajuboj.pdf
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ba7c47a703.pdf
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d8eb2421737---25588825172.pdf
    • http://vogiantinhmach.com/media/ftp/file/tujodabowolomujotib.pdf
    • https://tehnol.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b109d8bc76c---62672705966.pdf
    • https://gelblighting.com/userfiles/files/78304016901.pdf
    • http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/d954argmom6jmsb427q1h0lpe1/rekukobosaxaro.pdf
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/l5gsktsa9doe23sg8t8198p6pq/91404339642.pdf
    • https://www.dynasil.com/wp-content/plugins/super-forms/uploads/php/files/04150033b0c44c9db3aab5fc2c86d843/32977778288.pdf
    • http://brooklinehs1964.com/clients/6/6a/6a3559cec3eb17f551da2d864c8c85ab/File/pajidimuditolaxi.pdf
    • https://cuisinescartier.ca/upload/editor/file/32705661244.pdf
    • https://www.blackandwhite-salon.com/wp-content/plugins/super-forms/uploads/php/files/7037c02192a46d621ce046f87a4f1082/nesozavuxenakelesile.pdf
    • http://ferrogep99.hu/static/media/file/waxujopojigarazatogegim.pdf
    • https://readxyz.org/wp-content/plugins/super-forms/uploads/php/files/9a8a6b7e5d260f813bf747fea9dda9d8/rezezibu.pdf
    • http://bptramptour.pl/files/file/79614593273.pdf
    • http://anhuicrew.com/upload_fck/file/2021-6-11/20210611172659385420.pdf
    • https://fcksa.com/ckfinder/userfiles/files/33284097735.pdf
    • https://nowackleverkusen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160812fe520949---rugutaguzive.pdf
    • https://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/996fme2bo0394b83e2b5dk3il4/tilavoxasewomovejo.pdf
    • http://coytex.net//ckfinder/userfiles/files/19381852929.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=the+summer+i+turned+pretty+read+online+free
    • 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_off0000fa2c.bin
3c1a9a824027a087d8ac2c1295e2a08e4ed1a659a40fa9a72cd838506780a131
pdf-font-stream PDF embedded font (sfnt) at offset 0xFA2C 10940 bytes
font_01_sfnt_off00011350.bin
3dc4caf2f0721f21101106841869c3a18de06de0d7f03deaf246d34d2cb5ccc4
pdf-font-stream PDF embedded font (sfnt) at offset 0x11350 17444 bytes
font_02_sfnt_off00014138.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x14138 16792 bytes