Malicious PDF — malware analysis report

Static analysis result for SHA-256 24dfe19dc2c309e2…

MALICIOUS

PDF

83.4 KB Created: 2021-08-12 11:30:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 39bd5e9d409d26d960f90d67d1cc2b26 SHA-1: ddbd223f5ce510bb08949d9e61ff383d9657b0f3 SHA-256: 24dfe19dc2c309e2a26e6aceae74c6d7463d967f0c1c337c676d87ff5b49004a
184 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to potentially compromised WordPress upload directories and disposable hosting, indicating a link farm designed to trick users into downloading further malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 8

  • 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.
  • 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 https://tosto.cl/ckfinder/userfiles/files/wikumisulanipod.pdf
    • http://sqc.jp/user_data/editor/ckfinder/core/connector/php/upload/files/tixisikodisi.pdf
    • http://scottsdalehighbeavers1978.com/clients/80197/File/44611182997.pdf
    • http://meble-tk.pl/userfiles/file/fosewowikupiso.pdf
    • https://toptenstudy.com/upload/files/BodyFile__60C3C9B67DD72.pdf
    • https://agentcctv.com/userfiles/file/lodixupowegidezajak.pdf
    • https://eubeer.vn/uploads/files/voxuvama.pdf
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/160805670f19ed---fekizofusosowosi.pdf
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/b935e8a715c2ceef8cac9692d8d49d64/46006157683.pdf
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/160c74239eaff0---17274172274.pdf
    • http://giftboxvietthuy.com/upload/ck/files/96331597291.pdf
    • http://mosvag.ru/img/lib/file/32358614395.pdf
    • http://gdgom.com/upload/file/2106050911339160233rhvvg746dxi.pdf
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160796b0f97fdd---wutexajupinu.pdf
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d01df73fec---55807600653.pdf
    • https://centar-znr-zop.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1607acc3ce1f43---xepelizitetogokosojorog.pdf
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b20105abb54---98105442238.pdf
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/c872db9f8376e61d2699e050ddbfefe3/mivelop.pdf
    • http://damoorefamilyreunion.com/clients/7/71/71c8bb141a0941b69292984b9770a174/File/72796909813.pdf
    • https://twfern.org/upload/ckfinder_temp/files/20210527171033.pdf
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2b3a34c984---pebonitajorofiz.pdf
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/evlirttn06e0qu5l6a1c2vifu7/26300124936.pdf
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608bb9f0ce0b8---98377655490.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=tere+bin+nahi+jeena+mar+jana+dholna+song+download
    • 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_off0000e11b.bin
619b3708615443ded9d4f22e54f3bc49799beffb85a143ae5b8faec670857a66
pdf-font-stream PDF embedded font (sfnt) at offset 0xE11B 10916 bytes
font_01_sfnt_off0000f9ed.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF9ED 16792 bytes
font_02_sfnt_off000111ff.bin
335b2b6cfa704623e72f2368538543a57ffb1affe92b8cff76c608b533e76055
pdf-font-stream PDF embedded font (sfnt) at offset 0x111FF 17100 bytes