Malicious PDF — malware analysis report

Static analysis result for SHA-256 b129288ca5745436…

MALICIOUS

PDF

94.0 KB Created: 2021-09-05 04:15:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 8aea7128d254fefff346b6a8633ca8c0 SHA-1: 5d775393e15ad96ff1d7c2157400187639c88b83 SHA-256: b129288ca57454365d0451b4be1e6ad425e6337ade35768df9811a5cce5290be
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious File

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 heuristics suggest it functions as a link farm, potentially leading to further malicious content or phishing attempts, and contains language consistent with invoice or payment lures. No scripts were extracted, but the document's structure and embedded URLs point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 8

  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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 http://jrpst.pl/userfiles/file/tozato.pdf In PDF document text
    • http://otczenacts.com/media/files/kupirokabutavepuputow.pdfIn PDF document text
    • http://tostonet.cl/ckfinder/userfiles/files/maxixorimikezifiruzelek.pdfIn PDF document text
    • https://tuvanthietke13-5.com/webroot/img/files/xixaf.pdfIn PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/161316216aa6d3---suxipixet.pdfIn PDF document text
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/142cc675c35673639a3b2526e7db1e9e/furevogexavuvogo.pdfIn PDF document text
    • https://apoc.com.au/wp-content/plugins/super-forms/uploads/php/files/0fc31b3c03aff45f8f86f1bf619734ae/163589996.pdfIn PDF document text
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/6547f3163edbd6387afaecf5f0062000/wumokuvebukapuresegedo.pdfIn PDF document text
    • http://gdlianyu.com/uploadfiles/file/73554127917.pdfIn PDF document text
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/c5842921ff5b8b7b741beb3d3ee7a9ee/60632785776.pdfIn PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b4aade871fe---1666054441.pdfIn PDF document text
    • http://jngf.cn/files/file/3904277314.pdfIn PDF document text
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/160e4b46a9e57b---juvupemupesuzuwula.pdfIn PDF document text
    • https://pediatricpotentialsnj.com/PP/PPpng/files/lekowawubajit.pdfIn PDF document text
    • http://gelikonline.ru/content/Files/lalosexikidup.pdfIn PDF document text
    • http://bogaarchitetti.it/userfiles/files/42784949370.pdfIn PDF document text
    • https://spherule.org/wp-content/plugins/super-forms/uploads/php/files/ros6tpr2qh3il3kit7gu3maig0/25740883339.pdfIn PDF document text
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3d78504f49---mewozi.pdfIn PDF document text
    • http://babywagen24.de/userfiles/file/bivuzigaxojizetik.pdfIn PDF document text
    • https://manage3.realtourvision.com/rtv/ckfinder/userfiles/images/files/daxajogegolulogirasexuba.pdfIn PDF document text
    • https://cobrawire.com/userfiles/files/76152201892.pdfIn PDF document text
    • https://healthmatters.me/userfiles/file/gajuwuded.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=manual+sistema+microsiga+protheusPDF 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_off0001038b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1038B 20448 bytes
SHA-256: b506e8eddbba979fbcdd0f2ac17cccd02279b98e882dcbdb74b6563bec36dc53
font_01_sfnt_off00013943.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13943 10916 bytes
SHA-256: 2fd35b273e52f4ac8a43c3b6ee58f227421f20a13dd12da2cdb5a24e780c7d61
font_02_sfnt_off00015254.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15254 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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