Malicious PDF — malware analysis report

Static analysis result for SHA-256 e02b0595af21a57b…

MALICIOUS

PDF

88.0 KB Created: 2021-08-19 23:29:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 84c3c0f7a57054829c6aa7d3b7b9f543 SHA-1: a1514f596e2d22e1bd790ded54778b0880b97a41 SHA-256: e02b0595af21a57b8194d65e8eb36c7c40c2c2b9068afba4c42bf6549f65a005
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains a link farm pointing to numerous URLs, many of which are hosted on compromised WordPress sites or disposable domains, suggesting an attempt to distribute malware or phish for credentials. The document body is heavily obfuscated and unreadable, providing no direct clues to its intent beyond the presence of these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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 http://handbook.hu/upload/page/file/wuvazeke.pdf In PDF document text
    • http://www.suffaheducation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3608bd9dc0---jikelisefo.pdfIn PDF document text
    • http://www.heksan.com.pl/file/21438287916.pdfIn PDF document text
    • https://evermoral.hk/upload/file/1625771383.pdfIn PDF document text
    • https://www.lashharmony.co.uk/wp-content/plugins/super-forms/uploads/php/files/9li4hv1blnqok13ujum2cs670i/jidid.pdfIn PDF document text
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d372a4faee---jotofabamasivodadizuram.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f8f44c11892---vuzevu.pdfIn PDF document text
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/a6771c2b849ce6fd7e954b4f4bbedb64/91233757146.pdfIn PDF document text
    • http://www.kindytennis.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfec4682bd6---wedeketuviziregozulejawi.pdfIn PDF document text
    • https://shriayurvednagpur.org/public/ckfinder/userfiles/files/gevofapigodosapa.pdfIn PDF document text
    • https://zlatartopalovic.rs//files/78882648541.pdfIn PDF document text
    • http://chocolatycakes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a43a597b581---35219906929.pdfIn PDF document text
    • http://olympicburger1988.com/uploads/files/17475156268.pdfIn PDF document text
    • http://tinavaron.com/ckfinder/userfiles/files/18495253891.pdfIn PDF document text
    • https://singaporeroadshow.com/wp-content/plugins/super-forms/uploads/php/files/f7de1da381361be1c1e4d866cf5eb997/71650927635.pdfIn PDF document text
    • https://thewaves.net/wp-content/plugins/super-forms/uploads/php/files/69p1nmam0qpsfhe3na7ghdkosh/51396357463.pdfIn PDF document text
    • http://giaodantanthaison.com/Images_upload/files/8151457140.pdfIn PDF document text
    • http://weighlessthisyear.com/ckfinder/userfiles/files/jawinululuvu.pdfIn PDF document text
    • https://bibliotheque-des-arts.ch/ckfinder/userfiles/files/41371918292.pdfIn PDF document text
    • https://beribuket.ru/wp-content/plugins/super-forms/uploads/php/files/68c2a9b3f88e6f1600bcea0499b4ac6d/ponawo.pdfIn PDF document text
    • https://produktybhp.pl/pliki_user/File/vezum.pdfIn PDF document text
    • http://taxiluzern.ch/khurasan/userfiles/files/88386707102.pdfIn PDF document text
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/9cc1625fde3caae214a57e05efd3196b/kuwakukadikujojixopek.pdfIn PDF document text
    • http://frutapacargentina.com/ckfinder/userfiles/files/bilabibukivumarufuziza.pdfIn PDF document text
    • https://vannordenvastgoed.nl/userfiles/file/55227822091.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=hay+day+hile+download+uptodownPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ebe6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBE6 21628 bytes
SHA-256: ff6921284fc9db5ed65f13951459de0cd6b56822bd21e980ce5f85218cc5b14e
font_01_sfnt_off00011ff9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FF9 10512 bytes
SHA-256: 33f94a97b25a9efbcdd89d748bf04359026e8eb8a4bc81f0f168a97b73e0a6ee
font_02_sfnt_off000137c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137C6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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