Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac380ce090a494d3…

MALICIOUS

PDF

86.1 KB Created: 2021-08-08 19:10:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 271381e0bc64ee06bd2592fe03aaf335 SHA-1: a4e84c1f17ee7ce1f232a6e3973a48cb1ac533a5 SHA-256: ac380ce090a494d347def73f7ae3ea12989afc88728cb528b2f31c0946a26532
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Numerous heuristics point to the PDF being a link farm hosted on compromised WordPress sites, designed to redirect users to external URLs. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's part of a phishing or malware distribution campaign, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://wastran.ru/uplcv?utm_term=second+conditionals+exercises+pdf+with+answers PDF link annotation
    • https://bbensonmft.com/wp-content/plugins/super-forms/uploads/php/files/bbcf265df5a378e689b95a6727295e06/10673706927.pdfIn PDF document text
    • http://valdhans.cz/userfiles/file/vujowira.pdfIn PDF document text
    • http://rgjbreunion.com/clients/6/69/6950e03db8b1ea894755b369f0a03c31/File/menikixexofape.pdfIn PDF document text
    • http://abakus-routing.co.uk/ckfinder/userfiles/files/42522568424.pdfIn PDF document text
    • https://nhatngudongkinh.com/upload/ckupload/files/18739157631.pdfIn PDF document text
    • https://themodernla.com/wp-content/plugins/super-forms/uploads/php/files/f6d92e0bcfb2f4afef00ffa480e734b2/juxazibose.pdfIn PDF document text
    • https://cristiandellavedova.com/wp-content/plugins/super-forms/uploads/php/files/1osfp9d87i6v33guk6h3ii61q2/24709168335.pdfIn PDF document text
    • http://mrs724.ir/basefile/drtiketcom/files/nemamo.pdfIn PDF document text
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607fb2eeaf380---wenebonepovuzuduki.pdfIn PDF document text
    • http://clubselectionvoyages.com/images/file/59956039277.pdfIn PDF document text
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/160bdc3765f7cf---97065721361.pdfIn PDF document text
    • http://saga.diamonds/uploads/ckfinder/files/70682863013.pdfIn PDF document text
    • https://bodwellassociates.com/wp-content/plugins/super-forms/uploads/php/files/c0faa45882a0bfdca1102664aa631c3b/tupobufinotasaforif.pdfIn PDF document text
    • https://psychologgia.pl/Upload/file/83664956956.pdfIn PDF document text
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/c1fe1b4bb9ca9c4935a031fb1120608f/43693807954.pdfIn PDF document text
    • http://princeworldwide.com/multimedia/userfiles/file/90773449946.pdfIn PDF document text
    • http://premium-h.info/files/files/doremifijexopejojapuf.pdfIn PDF document text
    • http://jmvlpslimited.com/ci/userfiles/files/luzomefaso.pdfIn PDF document text
    • https://mps-india.com/userfiles/files/41043691918.pdfIn PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4ddea03782---544470143.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_off0000e981.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE981 10980 bytes
SHA-256: 862209870c20c3e5839c8e8232590b03be63296d46f7eef62554abaee63223d2
font_01_sfnt_off00010300.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10300 18292 bytes
SHA-256: 8d9d968e2672b273620c4fb0d2ad4aea4936119d7168a9c5ca24ee38f19de5cf
font_02_sfnt_off000132c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132C3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1