Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a1900de81731f8d…

MALICIOUS

PDF

90.5 KB Created: 2021-08-01 13:36:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: f7bbfcebc4ca391536d58b9764a2443b SHA-1: 77a73e1d2263258eb5ec6c518478f01037a17fa0 SHA-256: 8a1900de81731f8d457a4dabbe70c252de4432f09188ff7734674560485f3ca1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, with numerous URLs pointing to compromised WordPress sites and disposable hosting, likely serving as a lure for phishing or malware downloads. The presence of external URIs and the nature of the link farm suggest an attempt to direct users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

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://catamma.ru/uplcv?utm_term=sat+word+problems+with+answers+for+grade+6 PDF link annotation
    • http://planetamama.ru/files/file/jefumujuluvab.pdfIn PDF document text
    • https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/38f479d364b8df3ab01942682acc20d0/71725079897.pdfIn PDF document text
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609c7c92bc980---xotodivejufusiruposixuwe.pdfIn PDF document text
    • https://primewestelectrical.com/wp-content/plugins/super-forms/uploads/php/files/620f59344b5cb74a84fc46c3f80bfeef/sekizowejuvaro.pdfIn PDF document text
    • https://chamsocmuihong.com/wp-content/plugins/super-forms/uploads/php/files/hgb88kqletb12m157tgkfo8pt7/48263073448.pdfIn PDF document text
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/3d58f701e1fb62eab8d321418ec60322/20817377559.pdfIn PDF document text
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/mlc9p06kc1khli05i0elvt51km/zajozaxamimobezuxilaxuwu.pdfIn PDF document text
    • https://kraftyz.in/ckfinder/userfiles/files/nuwezefulifu.pdfIn PDF document text
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16098476240b05---vazitajifekefo.pdfIn PDF document text
    • http://ahcxdq.com/uploads/file/012115181348.pdfIn PDF document text
    • http://delshadian.com/public/userfiles/file/bikelisakusateva.pdfIn PDF document text
    • https://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/453574e3e6ff3fdbe856855066d5c5a3/4674758808.pdfIn PDF document text
    • https://jdrum-music.com/uploads/ckfiles/files/17471792941.pdfIn PDF document text
    • http://grappin-annat-como.com/userfiles/grappin-annat-como.com/file/xefigilepepexad.pdfIn PDF document text
    • http://katachizu.com/img/news/files/kozurozuzesurigikinov.pdfIn PDF document text
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c7ba0b8f243---92380729406.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16097f17e05c7a---50247103940.pdfIn PDF document text
    • https://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/30tgsaprk6j0bprbvpp4njglac/69856075857.pdfIn PDF document text
    • https://sudhirsachdevaclasses.com/ci/userfiles/files/nunugafobepikovokefe.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/30a0eee90ca698a137917cf9d1a755aa/lusat.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c70b17ed33c---85661643922.pdfIn PDF document text
    • http://eraucheta.ru/uploads/file/poteruzuzufafuguzovotaf.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_off0000fbdc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBDC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000113ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113EE 17536 bytes
SHA-256: 4d1a4053f1239862534f7669be513e75abc0e3df3d61b90df5fb38f7399212ad
font_02_sfnt_off0001420e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1420E 11412 bytes
SHA-256: b188c4b96d86e907c70b1e3486a35e939b3e860c81e8bd92ea2dd871b87f6af7

Open this report in the interactive analyzer, or submit your own file for analysis.