Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8bb9e260e815f75…

MALICIOUS

PDF

106.9 KB Created: 2021-07-07 07:01:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 82340903f33c6a16f42685f6831a22e4 SHA-1: 53e339b189ac769e79ef18833117f27b2598ef48 SHA-256: f8bb9e260e815f758f89dec245b9b4866b9394121b125a0623be144ee182070f
156 Risk Score

Malware Insights

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

The PDF contains a link farm directing users to multiple external URLs, some of which are hosted on compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The document body is unreadable, but the heuristics and URLs point to a malicious link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9932

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://coretry.ru/uplcv?utm_term=best+idle+games+of+2020 PDF link annotation
    • https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/2fdf2257acb0fb703fb2d8ac0aa463c4/78387012742.pdfIn PDF document text
    • http://imbirimbir.ru/files/jalonazute.pdfIn PDF document text
    • http://xiaohecollege.com/d/files/fajutorenorinobu.pdfIn PDF document text
    • http://www.justgiveahand.org/wp-content/plugins/formcraft/file-upload/server/content/files/160adaa8cd1830---60519206417.pdfIn PDF document text
    • http://artkulinaria.pl/sites/default/files/file/zodumako.pdfIn PDF document text
    • http://moda-minulosti.cz/docs/momin/file/56228350305.pdfIn PDF document text
    • http://luberoff.com/userfiles/file/32461855687.pdfIn PDF document text
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160782ce9f2530---23511211739.pdfIn PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/160d56e6f2f1a7---risebawejiwotesu.pdfIn PDF document text
    • https://massagetheory.ca/wp-content/plugins/super-forms/uploads/php/files/057829e34c02db77a703c5fe560a63cd/sibegesenus.pdfIn PDF document text
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1608f8354d1e0a---luwono.pdfIn PDF document text
    • https://beautifullifeuk.com/wp-content/plugins/super-forms/uploads/php/files/53fd53a707ac9d32287b54c8626f2881/42305554653.pdfIn PDF document text
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/af5e961a16271dda0dcd2310a0c113d6/18550943449.pdfIn PDF document text
    • http://langmypham.com/luutru/files/gekepizino.pdfIn PDF document text
    • https://www.idromeccanicasrl.com/idromeccanicasrl.com/wp-content/plugins/super-forms/uploads/php/files/9bb1bb0f0fc0177af05f2d237c34a203/81188485906.pdfIn PDF document text
    • https://colegiumaniucarei.ro/ckfinder/userfiles/files/11100032107.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/n21232cbr42t9h642a2htkd2o1/6695191162.pdfIn PDF document text
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/160874cf8a4f95---mabinabulejaru.pdfIn PDF document text
    • http://valeneighbors.com/userimages/93421451211.pdfIn PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d56df60f659---gobixenisade.pdfIn PDF document text
    • https://weblative.com/wp-content/plugins/super-forms/uploads/php/files/i7dhjsdqrivk3ciemj3f7vgjq0/80829387683.pdfIn PDF document text
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/1239bde229df66f562f518b65e8d72de/47014899359.pdfIn PDF document text
    • http://feg.vn/uploads/files/26975551701.pdfIn PDF document text
    • https://nikoljski.com/ckfinder/userfiles/files/55721583794.pdfIn PDF document text
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a15b6ac3a02---mudis.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_off00013eaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13EAA 10788 bytes
SHA-256: 5e9c79dd51fb1738a78303b70aa0771949d36c7edd6b9073a67782c68aeed33a
font_01_sfnt_off00015769.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15769 17960 bytes
SHA-256: 2d492d5ea6e5c27255301c5b96666ab8a358c336d3d8c906a2f4476f37cd0743
font_02_sfnt_off00018613.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18613 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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