Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4a40f835467c1ca…

MALICIOUS

PDF

82.5 KB Created: 2021-09-01 03:31:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 6dc2d2322ea99b14dbf6e67be46fe641 SHA-1: eae912a958402f8eb0db757501be5f2c79cbd75b SHA-256: b4a40f835467c1cae2752d943f31d7004e1c9f2f027fb1b38e5aa7787bc7f03f
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The ML classifier and ClamAV detection strongly indicate maliciousness. The PDF contains a link farm pointing to compromised WordPress upload storage, suggesting it's part of a phishing or scam campaign. The 'SE_CALLBACK_LURE' heuristic confirms the document's intent to trick users into calling a phone number, a common tactic in tech-support scams and callback phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9902

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
  • 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://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/65e2fefe91f5cad8169fa0803008bc64/rakoxojotulosepinal.pdf In PDF document text
    • http://travelci.ru/ckfinder/userfiles/files/81352951636.pdfIn PDF document text
    • http://fabrykakonwersji.pl/wp-content/plugins/super-forms/uploads/php/files/964292b70e97410c9e8048771f5269b3/worirofigizinakubojom.pdfIn PDF document text
    • http://statewideroadservices.com/clients/879378/File/57435171750.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608df8c6376c8---wopeb.pdfIn PDF document text
    • http://kondicionery-krasnogorsk.ru/upload_picture/file/zefesukejizofuk.pdfIn PDF document text
    • https://pinotcar.com/wp-content/plugins/super-forms/uploads/php/files/c0a7e23731c68dc5eeb808051128af23/nisimigebepodovefuzejagi.pdfIn PDF document text
    • http://delawaretravelmedicine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fc2e1b6e36---28255421109.pdfIn PDF document text
    • https://asoriofrio.org/ckfinder/userfiles/files/gekabavegazavuw.pdfIn PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/1606f00ae2da17---50585607305.pdfIn PDF document text
    • https://vibanghanoi.com/uploads/files/29629199361.pdfIn PDF document text
    • http://patp1ryb.ru/media/file/mogedosaponadibuwajotigon.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16107c436e52ad---27509136062.pdfIn PDF document text
    • http://pincailight.com/zk/UploadFile/file/2021061805094273499.pdfIn PDF document text
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/1606ccff954334---76199888347.pdfIn PDF document text
    • http://cukiernia-waltar.pl/qcms/userfiles/file/18220919357.pdfIn PDF document text
    • http://jyjjapan.jp/files/ckeditor/files/41928839870.pdfIn PDF document text
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/160c91674452ff---3551376058.pdfIn PDF document text
    • http://ahcxdq.com/uploads/file/102231227324.pdfIn PDF document text
    • https://bbpartner.cz/userfiles/file/4983520718.pdfIn PDF document text
    • https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/6b1ca0a7086fdf397c3097d3de3d0081/leginejavifebijij.pdfIn PDF document text
    • https://winston-woodward.com/wp-content/plugins/super-forms/uploads/php/files/662ed84f354403867d3e87862918fe2f/baleremalodefaxowu.pdfIn PDF document text
    • http://erbilsunhotel.com/wp-content/plugins/super-forms/uploads/php/files/dib1t8hgafm2cup6n4mmbf7b70/jujolefowixekazavob.pdfIn PDF document text
    • https://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/4cm7o5nofj697d2os72ruq4fd0/nuzikit.pdfIn PDF document text
    • https://erinmillssmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/bi8b5aejt790t9ld2dtjmj83l1/jakexijorifikivule.pdfIn PDF document text
    • http://kdwatch.net/upload/files/2021070103532084.pdfIn PDF document text
    • http://szyldkj.com/luodan/images/userfiles/file/gupilo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=sunset+in+englishPDF link annotation
    • 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_off0000de95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE95 17700 bytes
SHA-256: 50a780b8b3f711aa951ee2c2d65c326307d0863cde52a6abfaebede531248ac1
font_01_sfnt_off00010c43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C43 10180 bytes
SHA-256: 2a65772b192283ecff5afa103867bb130bfd5af6b82311413158de5c499c5e9b
font_02_sfnt_off000122fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122FB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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