Malicious PDF — malware analysis report

Static analysis result for SHA-256 3bff6e4637ce9248…

MALICIOUS

PDF

84.0 KB Created: 2021-09-07 07:45:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 05fac868f79d3c955970418c0eb077fa SHA-1: de15a505d00a722bf6f367850e939814541ac3cb SHA-256: 3bff6e4637ce9248d9a4323e47ea3ac5f634ec7fe795c3c7c67318326ac7b501
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristics reveal a link farm structure, with numerous URLs pointing to potentially compromised websites or disposable hosting, suggesting an attempt to redirect users to malicious content. The presence of embedded URLs further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 6

  • 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.
  • 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://philabc.ru/uplcv?utm_term=masterformat+16+divisions+pdf PDF link annotation
    • http://studiotecnicolari.it/userfiles/files/wudoriwitevumali.pdfIn PDF document text
    • http://gojjang.com/uploads/files/34375899850.pdfIn PDF document text
    • http://visit-pune.com/userfiles/file/62427596566.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a34cfadfeb3---49189785542.pdfIn PDF document text
    • https://orkhaconstruction.com/wp-content/plugins/super-forms/uploads/php/files/dqh8k6lalafaioo13dno3o7bov/71240407555.pdfIn PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae55666a441---60634797008.pdfIn PDF document text
    • https://tinnituskozpont.hu/files/ronar.pdfIn PDF document text
    • http://saltyfeelings.com/userfiles/file/vegedetejurif.pdfIn PDF document text
    • http://southfieldhigh1973.com/clients/2/27/27a5067865c8334ad4a5a1fd7642c928/File/sanujejavetagidopex.pdfIn PDF document text
    • https://oceanflowerhotel.com/uploads/image/files/fogoxekovazopa.pdfIn PDF document text
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a77e4de96d9---76396879848.pdfIn PDF document text
    • http://pasaru.com/upload/files/vejeratumuludaxuritotomu.pdfIn PDF document text
    • https://teenvolunteer.org/wp-content/plugins/super-forms/uploads/php/files/f3d2dd3263b94a500afd85dab489b418/vofitafewe.pdfIn PDF document text
    • http://volkshilfe-vlbg.at/images/content/files/36133055223.pdfIn PDF document text
    • http://stasta.com/userfiles/file/gizurofameruvajeratixavu.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/283d2982597d71d70071b3266308423b/dunirolerujeburebutosedak.pdfIn PDF document text
    • http://ajivikafinance.com/userfiles/file/zudafinij.pdfIn PDF document text
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/69e8b4e69b6d22c92ea87043754c8d57/48948546481.pdfIn PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095ae8697771---58487777568.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/84313578482.pdfIn PDF document text
    • https://big-cash.de/wp-content/plugins/super-forms/uploads/php/files/fg8mt7ehp43s7ff03n61qaq3k4/silope.pdfIn PDF document text
    • https://clifestyle.net/uploades/userfiles/file/wozujubepupunewutafoda.pdfIn PDF document text
    • http://busangh.com/attfile/fckimg/file///2021083118181_715913051.pdfIn PDF document text
    • http://ezibra.pl/upload//file/19957652094.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e258.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE258 10892 bytes
SHA-256: 4451cab1b13cb86ee4dbf24a9c4ade7e32845115b68bf5526e75ff7b9ff0feb7
font_01_sfnt_off0000fbae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBAE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000113c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113C0 17972 bytes
SHA-256: 5cf6f9697df754f99914b7d29cfdf43d77096ab873fdb6a146bc9477cb622d65

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