Malicious PDF — malware analysis report

Static analysis result for SHA-256 333e1738ffd1fc00…

MALICIOUS

PDF

84.5 KB Created: 2021-09-17 15:32:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c24fd019fa1f1d4d0c004c13dbe34ef4 SHA-1: 03132bbe4c445fe1c140c0583cccf9bcc977eb24 SHA-256: 333e1738ffd1fc0025cbc78e3f5b0aa31e930acb78f25230b1e83a9dcb8eb029
164 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 CMS upload directories or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://photopuzzle.net/userData/board/file/9148679765.pdf
    • http://aeskulap24h.de/wp-content/plugins/formcraft/file-upload/server/content/files/161413ba7e1e2a---61472270002.pdf
    • https://saglamahsapkutu.com/img/editor/image/file/74292033670.pdf
    • http://spartaksedlec.cz/spartaksedlec/userfiles/file/zumar.pdf
    • http://svx.su/ffile/file/siwatasebipadajagiluli.pdf
    • http://www.bsa.by/ckfinder/userfiles/files/silewodaditugo.pdf
    • http://farashimirooz.com/files/70218639456.pdf
    • https://www.db-ynox.fr/ckfinder/userfiles/files/todizadebevivi.pdf
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613589d6ca83f---59473813387.pdf
    • http://soles2walk.com/data/file/64334807388.pdf
    • http://ambiance-cinema.fr/wp-content/plugins/super-forms/uploads/php/files/83b3d5d07f62acf35a934e78d4bf34f0/tukapidawofu.pdf
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/161413e193af8c---dovidi.pdf
    • http://anais.terminarz.online/kosmetyczka/krakow/files/60576059377.pdf
    • http://perevodvnegiloifond.ru/pict/file/77984866221.pdf
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136fde224247---lajixuzetiw.pdf
    • http://bodybybodyology.com/ckfinder/userfiles/files/pomoxiwun.pdf
    • https://gancza-yacht.pl/userfiles/file/69321251671.pdf
    • https://binarbaid.com/public_html/userfiles/file/36112051738.pdf
    • http://naitikfashions.com/ckfinder/userfiles/files/jenepalevaxaru.pdf
    • https://manorhair.com/uploads/files/202109112047124742.pdf
    • http://midel.me/userfiles/file/ritupona.pdf
    • https://millinerandassoc.com/files/file/zikajejuru.pdf
    • http://assotechne.eu/userfiles/files/xirikubivukejewotupugibo.pdf
    • http://robbes.nl/media/files/laxoginozu.pdf
    • https://taxforce.nl/userfiles/files/94733636672.pdf
    • http://staresecurity.com/userfiles/file/84388211936.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=remix+os+on+usb
    • 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_off0000da50.bin
5c4f135789dc4bba0138014be3080259d791e60ed7db2959a057609c9da7d8a8
pdf-font-stream PDF embedded font (sfnt) at offset 0xDA50 10252 bytes
font_01_sfnt_off0000f159.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF159 16792 bytes
font_02_sfnt_off0001096b.bin
675e7b6c809c135287e06c2079ca8c97bf719e3c33e7bde5cd708837b30eb872
pdf-font-stream PDF embedded font (sfnt) at offset 0x1096B 22468 bytes