Malicious PDF — malware analysis report

Static analysis result for SHA-256 487cbd9479cb509a…

MALICIOUS

PDF

96.4 KB Created: 2021-07-31 00:07:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 604ab8ea0ee9ae6834ea35344950eec9 SHA-1: bb2812542dce5669f80f177d1cfba9ff02d73d81 SHA-256: 487cbd9479cb509a2a388f12ff3b65f5572a1cbcd37ace867727b01f56d41d04
176 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier indicating a high probability of maliciousness. The presence of numerous external URIs, many pointing to compromised CMS uploads and link farms on disposable hosting, strongly suggests a phishing or malware distribution campaign. The 'SE_CALLBACK_LURE' heuristic indicates the document likely attempts to trick users into calling a fraudulent support number, a common tactic in tech-support scams.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9888

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://archism.ru/uplcv?utm_term=washington+county+ny+sex+offender+registry PDF link annotation
    • http://www.cenlaenvironmental.com/siteuploads/editorimg/file/17106470771.pdfIn PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d8fe1b9290---femibalasilagowemuxugew.pdfIn PDF document text
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f5125d71433---69920540559.pdfIn PDF document text
    • http://firewheels.pe/userfiles/file/74622265960.pdfIn PDF document text
    • http://criminisiepartners.it/userfiles/files/noxaxevasebosuvipovugo.pdfIn PDF document text
    • http://sbkf.org/files/files/15327010632.pdfIn PDF document text
    • https://btcauction.vn/hinhanh/file/kixibuzafitobe.pdfIn PDF document text
    • http://thehawthornnyc.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070f541b8e8b---918968829.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608c1dbe5a8d9---24828181819.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fb614a2db0---45295444342.pdfIn PDF document text
    • https://ladychief.com/wp-content/plugins/super-forms/uploads/php/files/ee36576aea490e48cdf51e0b3070d423/30525737669.pdfIn PDF document text
    • http://0851gay.org/userfiles/202106file/2021062014423770554.pdfIn PDF document text
    • https://inlandautorepairmurrietaca.com/wp-content/plugins/super-forms/uploads/php/files/072f4eaf8cd476b0e48d976930ed21d8/828553493.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a945440b55---murixerasorevitipi.pdfIn PDF document text
    • http://xn--9p4b29dncp2cc6y.net/upload/fckeditor/file/lixakisegexulegivaka.pdfIn PDF document text
    • https://xanbiente.de/userfiles/file/foxuwola.pdfIn PDF document text
    • https://buka.ru/sadm_files/25573451274.pdfIn PDF document text
    • https://thejasmineway.net/wp-content/plugins/super-forms/uploads/php/files/8ao5bs56qd9bumq985380o56p5/fugixodixunamalir.pdfIn PDF document text
    • http://balone.net/_upload/file///22744906847.pdfIn PDF document text
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/a9b9donnatjo1i9jbu8d21gr3l/zanisufagamogasalatavob.pdfIn PDF document text
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ff3cbc96ac---badinaxemiratofepupu.pdfIn PDF document text
    • http://cheapneasytrafficschool.com/CheapNEasyTrafficSchool/pa/trainstation/uploads/image/file/dadegiroveponi.pdfIn PDF document text
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/n05hvmsbhegrk4lnfr4aau2o6a/xidege.pdfIn PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/160836dcf74d98---3578880337.pdfIn PDF document text
    • https://www.alpha-dynamics.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1609740096984f---tavuzirexogemowi.pdfIn PDF document text
    • https://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/18d9080bd0863990838c174ff58a6231/86873757649.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_off000115a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115A1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012db3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DB3 17080 bytes
SHA-256: f96672d5dd68146624eec4121cc8054138ec9492733024a2eaf7504f28f1a338
font_02_sfnt_off00015a06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15A06 11016 bytes
SHA-256: 37afbf91b993f37c1deece3fe9f70a4a011a1c22f2a8029bf7561b676492133a

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