Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8bb999fcd544905…

MALICIOUS

PDF

69.2 KB Created: 2021-04-29 20:28:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 978560b416e973f957edc19f10d2b9a5 SHA-1: 4b5e18c27860464015b81e62ce9eeb438bef8242 SHA-256: c8bb999fcd5449050749628d015117884c8714c175dea3c177fbcbf6116630ed
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to compromised WordPress sites and disposable hosting, suggesting a link farm used for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded links strongly suggest it is designed to redirect users to malicious content, likely as part of a spearphishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087a2a5c3e5a---xisijomupuputevajuvo.pdf
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1608169da6d716---raloguzazojenadux.pdf
    • http://lotuscourtpune.com/wp-content/plugins/super-forms/uploads/php/files/ckb24od4qube2eltu2ruj6dhc0/ginabakafulemo.pdf
    • https://autotrilogy.com/wp-content/plugins/super-forms/uploads/php/files/637e55f7c28954ecf2480ab863e611fd/16005235273.pdf
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607db8cf70e54---94143961443.pdf
    • http://ahkjt.com/upfile/file/51137459325.pdf
    • https://www.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16076fe34972f7---90335939528.pdf
    • https://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/245aac6fbe18b3998f509c37388782c4/2702968323.pdf
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/3522a1a4f2fbf504a9e7acf8409e5135/sulimote.pdf
    • http://www.associatedomains.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607da3c672bd5---domuleximibukimazo.pdf
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/m5p5caium2ebujov0gnrl5hoq3/79864691214.pdf
    • https://www.icslights.com/wp-content/plugins/super-forms/uploads/php/files/c6665c35cd7559870128ce37c79626aa/wajon.pdf
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608aa6ab1817e---nixuza.pdf
    • https://www.marvistasales.com/wp-content/plugins/super-forms/uploads/php/files/6fb4ebeec675561f80643f80d97ccf39/bagubivajiku.pdf
    • https://www.idahomedia.com/wp-content/plugins/super-forms/uploads/php/files/dbe74e720282ae37df7194f1af9477db/gisojigazeduwozu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=border+information+services+officer+job+description
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d2ed.bin
95c6aba10aaf895a457b93debe42d9cd405917f53445fd8c5fd9bb9457bdae92
pdf-font-stream PDF embedded font (sfnt) at offset 0xD2ED 5592 bytes
font_01_sfnt_off0000e5e2.bin
8b03be66f87a4cf20d0f14e46454a6e19c06d293945a5ec5e40d014b84bb55d2
pdf-font-stream PDF embedded font (sfnt) at offset 0xE5E2 9888 bytes