Malicious PDF — malware analysis report

Static analysis result for SHA-256 50bf596a406db073…

MALICIOUS

PDF

76.7 KB Created: 2021-05-25 17:48:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 50b993082ea7a89011b9617ef4c31f17 SHA-1: 501c5cee0115e583272a5d69ae4a967ab9388189 SHA-256: 50bf596a406db07383eb2f32ccaad17bc442f4014bff7c3652a5258b0a8dd24d
196 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, and exhibits characteristics of an advance-fee scam lure. It contains numerous links to PDF files hosted on compromised WordPress sites, suggesting a distribution mechanism for phishing or scam content. Although no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a phishing or social engineering attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Advance-fee lottery/parcel scam lure high SE_ADVANCE_FEE_SCAM_LURE
    Document contains lottery/beneficiary or prize language together with large-value draft/funds wording and parcel/courier delivery requirements. This is a classic advance-fee fraud document shape.
  • 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://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608d51221f39c---34947572657.pdf
    • http://aclamerica.com/customers/CMS-IMAGES/file/7314248612.pdf
    • https://businesslife.com/content/file/24790482922.pdf
    • http://www.nowsingapore.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/16073ed9d605de---kemewo.pdf
    • http://mattstergamer.com/wp-content/plugins/super-forms/uploads/php/files/n3fivq0vvfbepcg33faaocggjf/damux.pdf
    • http://www.atrium-tuiles.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a61e1e8d34c---mivupotadinanawiwomabo.pdf
    • https://traveltokiev.com/wp-content/plugins/super-forms/uploads/php/files/02uur198gl32fpgcummi6il087/75016939519.pdf
    • http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/on819m2kic9qkuk12cnaemlln6/35436393747.pdf
    • https://signaturetowerpune.com/wp-content/plugins/super-forms/uploads/php/files/8inuc0lp2ukfdevuonfufvht32/mojijatepag.pdf
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/160848c7ac106e---28070232583.pdf
    • https://artasedanasingaraja.com/uploadfck/file/toxoripenutasesonoxedat.pdf
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b457ed1591---17022206375.pdf
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a68344a79d7---31803694479.pdf
    • https://baodinhsolar.com/wp-content/plugins/super-forms/uploads/php/files/c24esbc7tjvu5dp4oqt3vgn5v4/20403467739.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=soccer+heads+la+liga+2016-17+unblocked
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000db42.bin
142d49e29cfdb0f0d049d242e0beddf0ee3e425f5d2bdc545db4907fb8da698b
pdf-font-stream PDF embedded font (sfnt) at offset 0xDB42 5904 bytes
font_01_sfnt_off0000ef3b.bin
c34cf59b649bafa243788f28d122a596aba9465dc77813d437f712a7691ab771
pdf-font-stream PDF embedded font (sfnt) at offset 0xEF3B 12808 bytes
font_02_sfnt_off00011790.bin
a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f
pdf-font-stream PDF embedded font (sfnt) at offset 0x11790 4324 bytes