Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c8044f3c8e6434f…

MALICIOUS

PDF

102.7 KB Created: 2021-07-08 04:22:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f6612506d8a472421655735cffa9b359 SHA-1: 4d980997f4e8f36d8eb2e182909f5a90f04274f3 SHA-256: 4c8044f3c8e6434fdc8ec7501dbe670a9b36e959900beed27425f2fb9069285d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ClamAV as a phishing trojan and ML classifiers indicated maliciousness. It contains a link farm pointing to multiple compromised WordPress sites, suggesting an attempt to lure users to malicious or phishing content. No scripts were extracted, but the PDF structure and embedded URLs are indicative of a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9806

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://www.travelticket.com.au/wp-content/plugins/super-forms/uploads/php/files/473cj7jram4c8koami9t4l97na/pugekakajuz.pdf
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160ce5f0c39765---63455965989.pdf
    • https://archcosmeticstudio.com.au/wp-content/plugins/super-forms/uploads/php/files/6a247ab7b435d7118779a6a05553dab8/fikuzazijoku.pdf
    • http://budka39.ru/files/kuxepijijuxopuvepe.pdf
    • https://transpack-krumbach.de/_upload_bilder/_filemanager/file/tasojexanamibefari.pdf
    • http://goksirlambinowice.pl/img/upload/files/nifetafufidamazawulora.pdf
    • https://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/04d89ec908fee8e86aba14b4bf0aceb7/noduravuwub.pdf
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078cb2697dda---45952553726.pdf
    • http://vilaportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c11dea0fe71---50306387691.pdf
    • https://accesoriosalmayor.com/images/userfiles/file/xoziwunipozuzib.pdf
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1609ba59ce41e2---jokonuvuzusetogubuxiruliw.pdf
    • http://skogsformedling.se/bilder_umeny/File/27239079611.pdf
    • http://parkwaywest1974.com/clients/861606/File/futamebewajovifob.pdf
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/q3vidnnqbunqa3e7pjtje5kna7/9067348769.pdf
    • https://sofupingame.com/calisma2/files/uploads/51977324132.pdf
    • http://www.orhancoskun.com/wp-content/plugins/formcraft/file-upload/server/content/files/160866c5daa061---9543283109.pdf
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606faa2933267---61860667887.pdf
    • https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5848aa3c12---25340470501.pdf
    • http://yachtandgulet.com/userfiles/file/legugovigoxoju.pdf
    • http://bertrandetgastineaudesigners.fr/userfiles/file/bitasajerekituvabuf.pdf
    • http://boekenwinkelindex.nl/images/uploads/paner.pdf
    • https://bodwellassociates.com/wp-content/plugins/super-forms/uploads/php/files/f92f781f0a2995f019259d3663abc31f/tigukajatovevejekiwiruxer.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=elbow+room+meaning
    • 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_002_off0000ece0.bin
d9f5e66163d907df9b2c2f031b8906ab183602eda4757f3e8ef428a9cf922d60
decompressed-pdf-stream PDF FlateDecoded stream at offset 0xECE0 18328 bytes
font_01_sfnt_off00010a7d.bin
28c1ae8b2bed15a00982b13e68557cf849d33a847c65a34c3d3fc061a97a762b
pdf-font-stream PDF embedded font (sfnt) at offset 0x10A7D 27468 bytes
font_02_sfnt_off00014de5.bin
1c479eb635b5f4d811ec5a0e1d36566092a7db7bb4462b097ad6fe9850fdd0f8
pdf-font-stream PDF embedded font (sfnt) at offset 0x14DE5 10396 bytes
font_03_sfnt_off00016555.bin
a8161c2f5ba9235eb51b4fcc43b6bb219725019365cb8d38f9ec25dfe5ce54ff
pdf-font-stream PDF embedded font (sfnt) at offset 0x16555 3464 bytes
font_04_sfnt_off000172d4.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x172D4 16792 bytes