Malicious PDF — malware analysis report

Static analysis result for SHA-256 2e619631eeb055d3…

MALICIOUS

PDF

86.9 KB Created: 2021-07-01 09:43:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 561978e31a040e843ae280d01a277c36 SHA-1: b44b52d48ff092c0020f20bc3f6f2894b1e64996 SHA-256: 2e619631eeb055d3d3926df78fba14246593902b8054a919850780e356ca7865
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to domains associated with compromised CMS uploads or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly support its malicious nature. No scripts were extracted, but the structure and URL distribution are indicative of a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9848

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://faradbox.pl/files/file/tiwesexofupuma.pdf In PDF document text
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160d2ff6e58524---77532291225.pdfIn PDF document text
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/731e5b9b9262d1631f142b7deff47010/95241218034.pdfIn PDF document text
    • http://stuarteisbrucklaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/rukevopalenomapotaduvu.pdfIn PDF document text
    • http://s-privod.ru/userfiles/file/72101507941.pdfIn PDF document text
    • http://naturallabs.de/userfiles/file/80205078232.pdfIn PDF document text
    • https://prokoncept.hu/admin/blogfck/image/file/35137506081.pdfIn PDF document text
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/6682d3bc6cb8047cc562e749fcb31ca9/japemozivofugoragimufa.pdfIn PDF document text
    • https://prolocolidodisavio.org/ckfinder/userfiles/files/vumujafugabodu.pdfIn PDF document text
    • http://clinicacomciencia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160918a449816f---56478212909.pdfIn PDF document text
    • http://www.canadavisaservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607061adcf204---mevemusa.pdfIn PDF document text
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/c27d30643118c621d075df271ad7cb86/16688252460.pdfIn PDF document text
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/b72d674a0b713d3220da9550d4a3677a/xopal.pdfIn PDF document text
    • http://pekingtogo.com/uploads/files/popuvatedok.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/nepan.pdfIn PDF document text
    • http://aivieksteslaivas.lv/userfiles/file/jizedaluwido.pdfIn PDF document text
    • https://barcelona-health.com/files/galeria/files/mumovus.pdfIn PDF document text
    • https://alkalacarservice.com/public_html/userfiles/file/40229768221.pdfIn PDF document text
    • http://bartuceviri.com/userfiles/file/93169183068.pdfIn PDF document text
    • https://profbuhotchet.ru/wp-content/plugins/super-forms/uploads/php/files/e391b3fda0df7a64cc5dd9368cc02a8e/xevagakadedovigax.pdfIn PDF document text
    • https://autosaloncenter.com/uploads/file/10380221800.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c2b953f1e1---3471098838.pdfIn PDF document text
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608d2b2fc8801---39232571153.pdfIn PDF document text
    • http://abacusnancy.com/userfiles/file/mogulu.pdfIn PDF document text
    • https://orldoc.ch/wp-content/plugins/super-forms/uploads/php/files/tu2nupsiq7njdo5mg9mbmrlbn2/govowisixigojanowom.pdfIn PDF document text
    • https://festival.bg/fckeditorfiles/file/wojurozaxodo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=5+cool+things+to+build+in+minecraftPDF 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_off0000ec19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC19 18672 bytes
SHA-256: b4147786d55358e7e167bbf9c7834bded8b2df01e993f6d2ba12c7467fae2591
font_01_sfnt_off00011c0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C0F 11200 bytes
SHA-256: 126317f91ac04405be8a30328407d6568eecc0322cd689d2b46970121e4d571e
font_02_sfnt_off000135e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135E0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1