Malicious PDF — malware analysis report

Static analysis result for SHA-256 77ff65047413a171…

MALICIOUS

PDF

99.4 KB Created: 2021-08-13 15:53:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 0388e69df77ab353dc49463f07abb668 SHA-1: e3c95c383857a14d8e7c01e892fad414249c1352 SHA-256: 77ff65047413a171ff6e2147ed29a9a4937a16f4b84fb76c699199fc5727cf59
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these links. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://coretry.ru/uplcv?utm_term=el+libro+salvaje+juan+villoro+para+leer+pdf PDF link annotation
    • http://finproekt-msk.ru/userfiles/file/80444745941.pdfIn PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607e47f6b373d---tewigebog.pdfIn PDF document text
    • https://vinisfarm.com/wp-content/plugins/super-forms/uploads/php/files/05f0f4669a572cb404b6412a992240fc/53216863788.pdfIn PDF document text
    • https://x-software.cz/data/file/27908784477.pdfIn PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9eb99da1bc---6992596667.pdfIn PDF document text
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/86ad7405e815b62c781d25a502ccc6db/jajagano.pdfIn PDF document text
    • http://medica-brno.com/files/giwajetikokujinagiv.pdfIn PDF document text
    • http://phsbulldogs1966.com/clients/8/87/87911cb64b10f66d93d15f7b6e22d365/File/77686688406.pdfIn PDF document text
    • http://zjqzzx.com/uploadfile/file/2021081009113473499.pdfIn PDF document text
    • http://ippon.lv/uploads/File/fibugepuvetez.pdfIn PDF document text
    • http://rahwayhigh.com/clients/42761/File/kababas.pdfIn PDF document text
    • https://thinkglobalcompliance.com/ckfinder/userfiles/files/jurekiwam.pdfIn PDF document text
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/e8e2od0ucv5t486jllakkddj2h/lumetunisefulodoki.pdfIn PDF document text
    • https://www.skyline-recruiting.com/wp-content/plugins/super-forms/uploads/php/files/ce04b55aa36e888402894ea698ceee5a/nelakej.pdfIn PDF document text
    • http://afghansolar.com/userfiles/file/45215728613.pdfIn PDF document text
    • https://olivier-daulte.com/ckfinder/userfiles/files/92207226105.pdfIn PDF document text
    • https://n95america.com/wp-content/plugins/super-forms/uploads/php/files/e5821c062982343bc2144a7d3130720c/bedibopegowim.pdfIn PDF document text
    • https://wills.sg/wp-content/plugins/super-forms/uploads/php/files/c80cf87d11070d9c3373f6dd599d614e/59522369484.pdfIn PDF document text
    • https://www.democratum.com/wp-content/plugins/super-forms/uploads/php/files/7ec8d11932ac476d82336cd16da1550d/mapadowuwezuvefipag.pdfIn PDF document text
    • http://nitexprofi.cz/userfiles/file/falorexadutobonolifejad.pdfIn PDF document text
    • https://kitapkapla.com/upload/ckfinder/files/pujadokuzokoxator.pdfIn PDF document text
    • http://arebiatours.com/uploads/files/favevedezukowofe.pdfIn PDF document text
    • https://forcechicago.com/wp-content/plugins/super-forms/uploads/php/files/41df3a26f9ff1b81419855d4777455d5/93066811932.pdfIn PDF document text
    • http://www.kickcommerce.com/userfiles/file/fazurixolokif.pdfIn PDF document text
    • http://dogoxuavanay.vn/uploads/files/wakevesixunetifa.pdfIn PDF document text
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000106b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106B1 19108 bytes
SHA-256: 01da10ec636366baf86f897f84740c5406f93929836cd95bfbd979cfabe47c62
font_01_sfnt_off000137c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137C8 16140 bytes
SHA-256: 00b1f632e8afe72716c8bcdb76b7901b56c060d1dc0f96f3f5c1b8373b85735b
font_02_sfnt_off00014d44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14D44 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off0001655b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1655B 10812 bytes
SHA-256: 2cc20adafb75c333ccdb6964bc0bfa0b8791daf98f0aa0c244d6253685ffc7a7

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