Malicious PDF — malware analysis report

Static analysis result for SHA-256 81a154b205b97d13…

MALICIOUS

PDF

78.1 KB Created: 2021-06-25 23:41:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2026-06-05
MD5: cc155d247f3e139a267cd65e24e0b7f9 SHA-1: 17dc116ad0dfce5c0aa189d30df2343e743c9520 SHA-256: 81a154b205b97d133c861bfe1a517bc2a4129c2e92984fc70d8a3c0300d57670
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised or disposable hosting domains, indicating a link farm designed to lure users to malicious content. ClamAV and ML classifiers identified this PDF as malicious, likely a phishing or trojan delivery mechanism. The presence of multiple external URI heuristics and link farm indicators strongly suggests an attempt to direct users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/2b320ba3ba60decb3e8414bdade0e336/36633814528.pdf In PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c1f6f85a19---wupoxajenanokalopedunotur.pdfIn PDF document text
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/78a39cc974ecad4a52c7afc2a23c6de5/punakurapofuxudored.pdfIn PDF document text
    • http://bsp-oblspl.org/ckfinder/userfiles/files/21016452304.pdfIn PDF document text
    • https://biovuspharma.net/userfiles/files/vufipewifakawupok.pdfIn PDF document text
    • http://www.julitolaschools.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083cfdfd7959---xuretijarepakutapemap.pdfIn PDF document text
    • https://benchmarktransitions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a307f662ef9---milifukal.pdfIn PDF document text
    • http://hpworld.hu/data/pic/Image/file/41400859049.pdfIn PDF document text
    • http://www.sport-konyv.hu/userfiles/file/xegixaf.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b00f07cb44---9725632316.pdfIn PDF document text
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a19ae20df63---97221850761.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/2hb2rh5iqc2375l19vnq6paqj5/31719788358.pdfIn PDF document text
    • https://www.karavanlakesfet.com/wp-content/plugins/super-forms/uploads/php/files/ac34f6201add43f1d75517278de80918/luteledodasi.pdfIn PDF document text
    • http://www.apsetedavisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e990547f3a---tegozasataza.pdfIn PDF document text
    • http://asokmontridental.com/userfiles/file/14032671976.pdfIn PDF document text
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/531ca145a7d763e841e0afe8d404481f/35022353146.pdfIn PDF document text
    • https://fobiy.net/wp-content/plugins/super-forms/uploads/php/files/ebc26cffeb27246f888cf90d62cce329/bilawivelakobi.pdfIn PDF document text
    • https://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/7ba27b98d612bb7a3986f39f66ff22db/vogidivakufepojesag.pdfIn PDF document text
    • https://xn--i1aam8cb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/47018b34962200f95c2e6864e48cb229/ralagobawudufok.pdfIn PDF document text
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bcfcbc40380---fekikonodufababamovevixeg.pdfIn PDF document text
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/1dd246d1d5c78e6a855df267b8dabaf5/13017288925.pdfIn PDF document text
    • https://fellowpeo.com/wp-content/plugins/super-forms/uploads/php/files/9c7c0eb2210048fbe5bdab5fcc392523/buzejukilezanijugat.pdfIn PDF document text
    • http://greenplanetnepal.com/userfiles/file/wuwazeduvefozogog.pdfIn PDF document text
    • https://e-lightingcontrols.com/wp-content/plugins/super-forms/uploads/php/files/a56c907bd5c82e26a72b6a7977a5bcba/jotakufej.pdfIn PDF document text
    • http://bartuceviri.com/userfiles/file/22272684505.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=the+ant+and+the+grasshopper+picture+book+pdfPDF 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_off0000cbf1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBF1 17144 bytes
SHA-256: 389414086577453a75a8d77974de2516f16fa684f4d1b520f1132cad1aa53fd4
font_01_sfnt_off0000f8e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8E1 11148 bytes
SHA-256: 08bedbe53f1f28612a589940d36b8d24e19a2617dd3522706bdfd24dbc5f3cb3
font_02_sfnt_off00011274.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11274 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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