Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f2f087a2c343642…

MALICIOUS

PDF

68.9 KB Created: 2021-09-23 02:43:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: de1d38d96a67595886591c30148b9a8c SHA-1: 3e822533786adaac747aed589ca76f144c9403b8 SHA-256: 0f2f087a2c34364245b93c26f18ce16335cf6030e577e11c153cd7d08c60f852
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories or are part of a link farm on disposable hosting. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure suggests the document's primary purpose is to redirect users to external, potentially harmful, sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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 https://www.nitm.ac.in/nitmeghalaya/ckfinder/userfiles/files/61010029566.pdf In PDF document text
    • https://birsamundapark.in/userfiles/files/90454435382.pdfIn PDF document text
    • https://getadoc.in/ckfinder/userfiles/files/zoludenam.pdfIn PDF document text
    • http://topoint.cc/userfiles/fckFile/20210917181310.pdfIn PDF document text
    • https://westhigienia.hu/editor_up/titejepugameduwobidifaj.pdfIn PDF document text
    • https://mgs-on-track.com/uploads/misc/files/48915813672.pdfIn PDF document text
    • https://airxps.com/userfiles/files/xixijipimu.pdfIn PDF document text
    • http://denkobarbell.com/_upload/files/ravigonozedigizojokedeg.pdfIn PDF document text
    • https://sharidendesignasphalt.com/wp-content/plugins/super-forms/uploads/php/files/c486b5fb91c5cd76e6f3fd06980130b3/92485907135.pdfIn PDF document text
    • https://fermuar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b9ae4ea3a2---binasodividipewidix.pdfIn PDF document text
    • http://hypotekaprezamestnancov.sk/res/file/47098827971.pdfIn PDF document text
    • https://proartgaleria.hu/files/files/72670743621.pdfIn PDF document text
    • http://qdxqw.com/uploadfile/file/67148737069.pdfIn PDF document text
    • http://artospace.com/pics/file/nufokozobag.pdfIn PDF document text
    • http://ventmetal.ru/userfiles/files/7941926414.pdfIn PDF document text
    • http://pileshoppen.dk/userfiles/file/54494577131.pdfIn PDF document text
    • https://legyenegyjonapod.hu/userfiles/files/bekizalisezedudijuzaku.pdfIn PDF document text
    • http://lnaixi.com/userfiles/file/20210908182015_673943271.pdfIn PDF document text
    • https://flavio-tonon.it/public/file/89171987564.pdfIn PDF document text
    • http://actinq.nl/upload/file/zapifigedatus.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/q3l3drugej3fmfgktj1acj7tv7/88180379033.pdfIn PDF document text
    • http://lafiestadelmoto.cz/files/file/borewefolenujumamexo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=roblox+download+happymodPDF 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_off0000b15e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB15E 10552 bytes
SHA-256: cd2a958fb30803082a3e4b40fb8be2a8d28b728a102f27ef48f934e933ad6f46
font_01_sfnt_off0000c906.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC906 14920 bytes
SHA-256: e09ea5366aa9d4af08b8a907bb7e4b4810e6864bdc47fb40d0d4eaf549a689bb
font_02_sfnt_off0000ee70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE70 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1