Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac309c96aeb35dcc…

MALICIOUS

PDF

74.4 KB Created: 2021-09-06 11:55:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 0b8ada936882b8fcc92c14ee63ef37f8 SHA-1: f46c3a12cf1bf1fe3524078d0d12c540b1a7aec7 SHA-256: ac309c96aeb35dccd17864f4b9421e8818da86c05c53f23f27033a247ee02402
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many of which point to compromised websites or disposable domains, indicating a link farm designed to lure users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. No scripts were extracted, and the document body was unreadable, so the attack pattern is inferred from the URL heuristics and the overall structure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://noddy.nu/images/file/fotepamalesuxudixidorowob.pdf In PDF document text
    • https://rosedreamholidayhomes.com/ckfinder/userfiles/files/17725236638.pdfIn PDF document text
    • https://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/tif07q6lv3mbcag3b42ni8tft4/77795035641.pdfIn PDF document text
    • https://cosplay-expo.it/ckfinder/userfiles/files/jiruvanosatasip.pdfIn PDF document text
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/359fb5e1351a35fda82c2739c0d2cc6a/guxeroseruxolukudapufezal.pdfIn PDF document text
    • http://highspiritsmusic.com/ckfinder/userfiles/files/numokuke.pdfIn PDF document text
    • https://plasy.com/uploads/file/losolofasuro.pdfIn PDF document text
    • http://firegallery.ru/img/upload/28901312885.pdfIn PDF document text
    • http://piqiso.ru/userfiles/file/kodewoko.pdfIn PDF document text
    • http://urduhadith.org/survey/userfiles/files/94424482465.pdfIn PDF document text
    • http://emrc.ie/upload/imagecontent/file/69284382975.pdfIn PDF document text
    • http://activesolutionelectric.com/images/file/gusitububaname.pdfIn PDF document text
    • https://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/eabe2eee3fc0f67e1def73a724ba0e22/bakikojose.pdfIn PDF document text
    • http://17njl.com/userfiles/files/2049410381.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e304fb33f5---zunumif.pdfIn PDF document text
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160867ab2cea58---6902324396.pdfIn PDF document text
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/160bbcf4ddaeb6---mupujofomefolevi.pdfIn PDF document text
    • http://www.grupohk.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16078e6129b025---23032841936.pdfIn PDF document text
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/39c5d292925bfd4816c879579782a625/tovaponefukepirudedagolub.pdfIn PDF document text
    • http://www.logistiekverbeteren.nl/ckfinder/userfiles/files/37583707761.pdfIn PDF document text
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/844fa39e860fb8f95519225edc1721f5/lajegojegulipajemuru.pdfIn PDF document text
    • https://xn--80aaa1anac6cg.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/ac15e92c1b9111b40703971a88e402aa/soror.pdfIn PDF document text
    • http://blueyee.com/upload/file/28135054975.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=akai+mpd218+manual+pdfPDF 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_off0000bdd6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBDD6 10596 bytes
SHA-256: 1ebb4acbb480e8190961839179d9dc03c972b6a3b03785a4690af0c61ef4d0b5
font_01_sfnt_off0000d60c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD60C 17744 bytes
SHA-256: 71212d5f6bac90c1fc8ca9574a109c834702aab60982186aa06a5c26ed440471
font_02_sfnt_off0001045b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1045B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1