Malicious PDF — malware analysis report

Static analysis result for SHA-256 42f78d36f8635dea…

MALICIOUS

PDF

92.2 KB Created: 2021-06-27 09:14:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 95ed0e3bd905630ec855f167108fc75e SHA-1: 2b7a62f5e1dff2cf44ee22dd421fee8c59559441 SHA-256: 42f78d36f8635dea9ff5a60a75a04e54fdf5b6c2fd42588c82bd1dbd0698864f
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating it is likely a phishing or malware distribution lure. The document functions as a link farm, with numerous embedded URLs pointing to potentially compromised websites or disposable domains. These links are designed to redirect users to malicious content, likely for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9936

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 http://greatnice.club/updatefiles/file/regime.pdf In PDF document text
    • http://bkbflooringusa.com/userfile/abbey/file/ferubowiz.pdfIn PDF document text
    • https://nutstudio.it/userfiles/file/ruvuxi.pdfIn PDF document text
    • http://skup-laptopow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160864f185f4c1---77787573215.pdfIn PDF document text
    • http://bangtaisay.com/uploads/userfiles/file/bokaniruma.pdfIn PDF document text
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607683478ac6c---mikupujevidudalavoz.pdfIn PDF document text
    • http://altelaw.com/uploads/image/file/7569107775.pdfIn PDF document text
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5e3dd1d52f---fukifevujelalasek.pdfIn PDF document text
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/955a5d2e9435430c06b7a4cca75424c8/xoxugasato.pdfIn PDF document text
    • https://leicht-spb.ru/wp-content/plugins/super-forms/uploads/php/files/ff305e4c2a8f6e59c49f0a80181c3e5e/79290953617.pdfIn PDF document text
    • https://segurosjdd.com/wp-content/plugins/super-forms/uploads/php/files/erfkd2r9uhabs13069hthbgiv7/todusus.pdfIn PDF document text
    • https://masihpt1.com/contents//files/nurobafimiku.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/temekabesinatalus.pdfIn PDF document text
    • https://tese.in/ckfinder/userfiles/files/mifiwujetisibaduki.pdfIn PDF document text
    • https://www.couleurs-et-jardin.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160a0f90581af1---mupariguvemifar.pdfIn PDF document text
    • http://ddaengshop.com/ckupload/files/52264969199.pdfIn PDF document text
    • http://dodici12.ru/wp-content/plugins/super-forms/uploads/php/files/o0eav8pch13hl826f78cm6onh0/tetenekexixitofikuxajunet.pdfIn PDF document text
    • https://kraftyz.in/ckfinder/userfiles/files/49405496164.pdfIn PDF document text
    • http://novussiteyonetimi.com/uploads/file/18069978655.pdfIn PDF document text
    • https://poolpoint.be/uploads/file/85636524458.pdfIn PDF document text
    • https://bilalyapidekorasyon.com/userfiles/file/96021791997.pdfIn PDF document text
    • http://shssailors1969.com/clients/3/36/366f78b21138e0f8005dfe6cc5e09e30/File/6166705335.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=realistic+rose+and+butterfly+tattooPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f09f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF09F 10868 bytes
SHA-256: c2ce2286f233202881cea0d3f2701e19db885e93c4b0bcae0377e6e34d606f79
font_01_sfnt_off000109e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109E4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000121f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121F5 16872 bytes
SHA-256: 9a7ca61dac964ce1985b7da110c3ab7694c4e2c0de546f9a689167f271f0cf93
font_03_sfnt_off00013a1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A1A 15876 bytes
SHA-256: 6eaad991b0cf071ecb70c5f43c2f0697f01ee056dac49cf780f0700a601c2096

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