Malicious PDF — malware analysis report

Static analysis result for SHA-256 b61846397d08f519…

MALICIOUS

PDF

87.8 KB Created: 2021-07-19 12:28:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 09ebed27ce7cc78af4c1ec095d948363 SHA-1: 41da0be0fc05bb7dd0f647d9a9fe1197e742a6bd SHA-256: b61846397d08f5197125d3ec992b5cf7fc3392d1b580c39a5fcde540bfc1a2e1
156 Risk Score

Malware Insights

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

The sample is a PDF document flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains a link farm pointing to multiple domains, many of which are hosted on compromised WordPress sites, suggesting an attempt to distribute malicious content or conduct phishing. The presence of numerous links on disposable hosting further supports this malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://nuyewpilot.academy/wp-content/plugins/super-forms/uploads/php/files/35cc6151e2718ce6974549d91262eddb/kuxidajeponejo.pdf In PDF document text
    • http://martom24.pl/martom/userfiles/file/rijisepidaresuniziraze.pdfIn PDF document text
    • https://gymlesgeants.com/upload/editor/file/26352483595.pdfIn PDF document text
    • http://svenstavik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cc40bafea1---69675628671.pdfIn PDF document text
    • https://abofahed.com/userfiles/file/38712440489.pdfIn PDF document text
    • http://beateromer.com/bilder/file/61534978404.pdfIn PDF document text
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/160e4a579634eb---12481793416.pdfIn PDF document text
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/516f679tfu37uu2ou83lmgdkk1/93839196751.pdfIn PDF document text
    • https://valserve.in/web/k/main_admin/ckfinder/userfiles/files/46555849132.pdfIn PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/16089b788459c6---99640725331.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607c5eef4e9fc---jasepobivodagug.pdfIn PDF document text
    • https://bangprice.com/bangprice.com/beta/cms_image/file/rodebabulenezovugiro.pdfIn PDF document text
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160ba7f418ec6b---97291458731.pdfIn PDF document text
    • https://www.arc-welding.co.uk/wp-content/plugins/super-forms/uploads/php/files/p173d5rgp7q5rhc0jqffgnnjem/40565223968.pdfIn PDF document text
    • https://earplighting.com/wp-content/plugins/super-forms/uploads/php/files/a021346a1b52bf6a5fb90838b1f1f7d6/55153560163.pdfIn PDF document text
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608095310047b---foxidukiga.pdfIn PDF document text
    • http://www.oomedia.com.tw/ckfinder/userfiles/files/nozebadozekibu.pdfIn PDF document text
    • https://stagerightstaging.com/wp-content/plugins/super-forms/uploads/php/files/32ee2098f35db3d621b45503c2e4f54b/41499451383.pdfIn PDF document text
    • http://ash-graphy.com/userfiles/file/13816421145.pdfIn PDF document text
    • http://rasciindia.com/firetech/ckupload/files/37990975874.pdfIn PDF document text
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d60aa6be4bd---xekigetakinureg.pdfIn PDF document text
    • http://ray-king67reunion.com/clients/41562/File/51862246810.pdfIn PDF document text
    • https://massagetheory.ca/wp-content/plugins/super-forms/uploads/php/files/36f7324f0d5ccb08a75dc79a36744978/zumewuralabuzetuxefa.pdfIn PDF document text
    • https://prosegik.com/wp-content/plugins/super-forms/uploads/php/files/28148ddd01ab4a7859486fdcb7405276/tupanadoxom.pdfIn PDF document text
    • http://dokumsuzgec.com/userfiles/files/76385655711.pdfIn PDF document text
    • https://www.ltgpartners.com/wp-content/plugins/super-forms/uploads/php/files/514151c62574f7b5f0e3bb6e2eb348d8/netinuliduka.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=short+project+proposalPDF 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_off0000f55d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF55D 17056 bytes
SHA-256: 7f94d5a455b84e93cae8791f21792d925770c8534c74b288ac39fadd3749434e
font_01_sfnt_off00012215.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12215 10480 bytes
SHA-256: 64eb24638fe1562d81d97454e54610e363f5901bbe0b6fb1435418f63f132746
font_02_sfnt_off00013a16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A16 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1