Malicious PDF — malware analysis report

Static analysis result for SHA-256 274c65951c326821…

MALICIOUS

PDF

89.2 KB Created: 2021-07-03 11:23:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 3bee6af2042e9fa403180ebe169d6299 SHA-1: ffe2d5f3aaa1f0231957cc82f250b4f34db5ca8d SHA-256: 274c65951c326821d63c168be94a40c6c60fcdb7114d402f12ec870a3dd04bd1
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier, with heuristics indicating a malformed exploit stream and a link farm pointing to compromised CMS uploads. The embedded URLs suggest redirection to potentially malicious sites, characteristic of phishing or malware distribution campaigns. No scripts were extracted, but the PDF structure and URL analysis strongly indicate a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • 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.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/160705f785ece8---repewefaduwujemu.pdf In PDF document text
    • http://appletechsolutions.com/userfiles/file/78393029858.pdfIn PDF document text
    • https://bestofbucerias.com/upload/file/8704096719.pdfIn PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c6d651d497e---6105791599.pdfIn PDF document text
    • https://beautifullifeuk.com/wp-content/plugins/super-forms/uploads/php/files/938fcd431c17e77c540806babc8509c4/78072244555.pdfIn PDF document text
    • http://dzbnf.com/upload/file///jukoruperogujovagijuzomi.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/160824f58dd198---wugonevuwuveba.pdfIn PDF document text
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/0a09034a2e64ceda626b6b262c98b111/zivixoredara.pdfIn PDF document text
    • http://quocteanviet.com/img-chamthi/files/98452221187.pdfIn PDF document text
    • http://wecans.net/_UploadFile/Images/file/puwozamajumak.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3a73499059---81759783590.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072c602ac295---gubojexewuvoduxudukuven.pdfIn PDF document text
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609eb8fa8e653---bifusomijadikadasur.pdfIn PDF document text
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/16072e72e39cd5---11177978938.pdfIn PDF document text
    • http://irina-beha.com/ckfinder/userfiles/files/nefupejuxofaf.pdfIn PDF document text
    • https://summit-christian-academy.org/scauserfiles/files/wikazuguxagedasijuwozup.pdfIn PDF document text
    • https://www.alpha-dynamics.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160afa425544d0---faderetonunevapeno.pdfIn PDF document text
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c69a2c63fd9---1624559127.pdfIn PDF document text
    • https://designcoordinators.com/wp-content/plugins/formcraft/file-upload/server/content/files/160780c19f308f---bowel.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084a080a333d---80618160577.pdfIn PDF document text
    • https://www.swissfillon.com/wp-content/plugins/super-forms/uploads/php/files/1e570f8cabd130447205545982399f34/23126822335.pdfIn PDF document text
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160761b3120ff0---makugob.pdfIn PDF document text
    • http://apricomm.com/userData/board/file/tazufifililelelitaderu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=adverb+clause+of+contrast+sentencesPDF 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_off0000fa14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA14 10664 bytes
SHA-256: 3f13cee3556a9a360fe8dcb51f6b0e634d23d2a7b8261721788f658089569068
font_01_sfnt_off000112b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112B1 17288 bytes
SHA-256: e317fe2ddb285439d48f990414b895dcb29270a8f4c056df77f0587e8b155bf1
font_02_sfnt_off00013fb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13FB6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1