Malicious PDF — malware analysis report

Static analysis result for SHA-256 83e937796fe48bc1…

MALICIOUS

PDF

109.3 KB Created: 2021-07-02 23:17:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 24dfab364d59a629b9c552709be37d48 SHA-1: e2b60d35d6dba6ab86f7ee0e3408886e102d0399 SHA-256: 83e937796fe48bc14de5c1420df0a1d35a81de8af88a48f7f35d0581ee8359c8
156 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It functions as a link farm, with numerous URLs pointing to compromised WordPress sites, likely to lure users to malicious content. The presence of external URIs and link farm heuristics strongly suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/d59c7b1feb9e972c21c6d1b8b4b69ec5/34969797335.pdf In PDF document text
    • https://fmpride.com/wp-content/plugins/super-forms/uploads/php/files/ecaa4fd85a13ad9adc81491e726e1c5e/19382363845.pdfIn PDF document text
    • https://daiichigroup.net/uploads/news_file/22935950319.pdfIn PDF document text
    • http://fipjp.com/userfiles/file/49362906753.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/90d595d3f7ac784b118f0b044ca6547c/buzunimekolupetorazelero.pdfIn PDF document text
    • http://championshipsportsrings.com/clients/23492/File/69547843007.pdfIn PDF document text
    • https://vetranhtuongmamnon.vn/wp-content/plugins/super-forms/uploads/php/files/jp4g5bv95dmhkp3dmotvvfqp2i/75601946154.pdfIn PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1aed4600f2---65113513177.pdfIn PDF document text
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160de4a4cd82d6---negumib.pdfIn PDF document text
    • http://reclaimsplus.com/wp-content/plugins/super-forms/uploads/php/files/3aceef866db8aefa9a4415139f5ac5b6/zukerorikuwegizef.pdfIn PDF document text
    • http://alhouti.com/userfiles/file/83963595646.pdfIn PDF document text
    • https://bluetact.com/locktactyuma/userfiles/file/lopelixikimosotadixef.pdfIn PDF document text
    • https://kimtuong.vn/isc/public/files/fckupload/file/6451605792.pdfIn PDF document text
    • http://bukharageorgia.com/sites/default/files/file/sizimuzigukata.pdfIn PDF document text
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/08648b250f674d2bbab4a9bcc988e110/86595447982.pdfIn PDF document text
    • https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/b2e60ea03a00de0da3410c4e2c62e20b/nasufi.pdfIn PDF document text
    • http://am-assets.com/aom/magnolia/userfiles/file/68365770590.pdfIn PDF document text
    • https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/9a4f95042a44a72c64ce1a427c28166d/raxogabo.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a84a826192b---geruwaratukopowobamadofox.pdfIn PDF document text
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/b9dd1ddf70f1ea96f727f56ad160c0d4/96235635440.pdfIn PDF document text
    • https://internationalmedia.com/userfiles/file/38816127311.pdfIn PDF document text
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609852f0db120---kinabebitibofudikeler.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=scripts+in+artificial+intelligencePDF 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

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_off00014b72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14B72 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00016389.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16389 10608 bytes
SHA-256: fbddd8588d1a657d98d301473e0d2d55b4063a881b5c407b011acc9d83cae039
font_02_sfnt_off00017bdc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17BDC 17152 bytes
SHA-256: 62462c4b5b4080946bc7bb2c50706d7fa5c7495d9b72da972a5da4033f97d846

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