Malicious PDF — malware analysis report

Static analysis result for SHA-256 463e2b14ce67c827…

MALICIOUS

PDF

72.7 KB Created: 2021-09-09 19:22:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 8f4132d64fd989fdbfd68b5c1c2a2f72 SHA-1: 971178118732138f433fc978eb25f78a80cd0fce SHA-256: 463e2b14ce67c8274a9e433b6bcabfea792867aa02b1f712f65fffa9b20ac2cb
156 Risk Score

Malware Insights

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

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Numerous external URLs were extracted, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm or phishing lure. The PDF structure and embedded URLs are consistent with attempts to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://philabc.ru/uplcv?utm_term=contract+law+questions+and+answers+book+pdf PDF link annotation
    • http://trungnguyenjsc.vn/uploads/image/files/zevizupovatigumalujo.pdfIn PDF document text
    • http://ciskmv.com/css/file/dawulupexezusagelamusav.pdfIn PDF document text
    • https://etravelbox.com/scgtest/team-explore/uploads/files/durakozufufomipemiwufatar.pdfIn PDF document text
    • http://canhtoanland.com/upload/files/43794582330.pdfIn PDF document text
    • https://makenie.com/upload/files/lofezesekotigijezozagez.pdfIn PDF document text
    • http://www.plain-pied.com/editeur/ckfinder/userfiles/files/goravukimomenarol.pdfIn PDF document text
    • http://santabruna.cl/upload/file/87279551619.pdfIn PDF document text
    • http://burmeseburmilla-allevamento.com/userfiles/files/rixurafitev.pdfIn PDF document text
    • http://neodev.space/wp-content/plugins/formcraft/file-upload/server/content/files/161358553badf0---tuwenosivar.pdfIn PDF document text
    • http://nyitotthaz.hu/userfiles/files/24993414982.pdfIn PDF document text
    • http://metallpress.info/files/vidogifup.pdfIn PDF document text
    • http://maulich.vn/attachment/files/vatusadewedaripu.pdfIn PDF document text
    • https://kanat.com/upload/ckfinder/files/votuzewosobijezeridik.pdfIn PDF document text
    • https://binhruamuinanobac.com/wp-content/plugins/super-forms/uploads/php/files/r3h7q2tta9k10v2eb47rkb8951/91919313309.pdfIn PDF document text
    • http://szerecsen.hu/editor_up/milevowozowiruso.pdfIn PDF document text
    • https://netwindowvn.com/uploads/userfiles/file/vovim.pdfIn PDF document text
    • https://jasz-pap.hu/UserFiles/file/49844495979.pdfIn PDF document text
    • https://digireg.lu/upload/fufiv.pdfIn PDF document text
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613828724bddc---5568763058.pdfIn PDF document text
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/16131ca94d21d4---57030388688.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613890f33c890---xanimami.pdfIn PDF document text
    • https://xlux.vn/wp-content/plugins/super-forms/uploads/php/files/7sp2ia67nigcrmshqpvthk8kum/xebetonulajivurulozi.pdfIn PDF document text
    • http://duythuc-bearing.vn/uploads/userfiles/file/71388626723.pdfIn PDF document text
    • http://geostudio.eu/userfiles/files/luxosetosekajudome.pdfIn PDF document text
    • http://dogomanhnghia.com/uploads/files/65571595094.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b7d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB7D8 11208 bytes
SHA-256: 55005ea62caa1c7a28ed954975eafa740bf7b029cf45077961b90b4492303b4a
font_01_sfnt_off0000d1e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1E7 16808 bytes
SHA-256: f59f7db15fe7ef0bf6134247f2a3daac9ea876a1d1bb7645b08c70011382f2a3
font_02_sfnt_off0000fcde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCDE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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