Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b68cdf28b995cd0…

MALICIOUS

PDF

69.4 KB Created: 2021-09-28 09:34:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 6bb339f95dbe5d4a77ac942951e7fbda SHA-1: 71e2ad80641d05330f034638527c020460d066b2 SHA-256: 1b68cdf28b995cd0edfe761a45d2c048cee8a2b8ebdad1ee3c8ef91dfe7006ab
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs that form a link farm, a common technique for distributing phishing lures or directing users to malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically identified as phishing. While no scripts were explicitly extracted, the PDF structure and numerous external links suggest it is designed to lead users to compromised or malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9837

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://huntic.ru/uplcv?utm_term=grand+theft+auto+v+no+verification+apk PDF link annotation
    • http://z-him.ru/userfiles/file/dedikiju.pdfIn PDF document text
    • https://borsalino.ro/imagini_ws/49532007462.pdfIn PDF document text
    • http://suamanhinhlcd.net/userfiles/file/rodutalasogono.pdfIn PDF document text
    • http://automozg.by/upload/editor/files/divilevebujutunuma.pdfIn PDF document text
    • http://shrlie.com/upload_fck/file/2021-9-17/20210917094914950086.pdfIn PDF document text
    • https://bearings.vn/images/ckeditor/files/3182333221.pdfIn PDF document text
    • http://stonestudio.pl/files/upload/file/7761662387.pdfIn PDF document text
    • http://zhxndl.com/uploadfiles/files/pewufis.pdfIn PDF document text
    • https://villatoscana-pi.it/userfiles/file/73621595138.pdfIn PDF document text
    • https://rajakeempat.com/contents/files/julelemapageduvu.pdfIn PDF document text
    • http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/4ebf453f2d1000647ef46d9757c033de/67799830495.pdfIn PDF document text
    • http://labuchedeberce.fr/userfiles/file/lixuviladidafeja.pdfIn PDF document text
    • http://cermak-expo.cz/data/files/file/71474592087.pdfIn PDF document text
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/161439f71f3aad---68809290389.pdfIn PDF document text
    • http://aitrans.org/UploadFile/file/F1202109050914236931.pdfIn PDF document text
    • https://pirkitpadangas.lt/ckfinder/userfiles/files/pilisas.pdfIn PDF document text
    • http://familie-schiecke.de/images/file/jalet.pdfIn PDF document text
    • http://www.barbazan-debat.fr/ckfinder/userfiles/files/dubobimuwubi.pdfIn PDF document text
    • https://www.singaporemedicalclinic.com/ckfinder/userfiles/files/65434131265.pdfIn PDF document text
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/161323f5b97caf---petosazepepakones.pdfIn PDF document text
    • https://fermuar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f1064cefe6---293811550.pdfIn PDF document text
    • http://ingegneriarossi.it/userfiles/files/62174665600.pdfIn PDF document text
    • https://happyfun.tw/uploads/files/202109081122331876.pdfIn PDF document text
    • https://diversifiedhumansolutions.com/wp-content/plugins/super-forms/uploads/php/files/1677d3d9e77c93e45335e030a0f9cf9c/92746004081.pdfIn PDF document text
    • https://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/d7c635bac565f4957d5a3c6c58e0ac1b/94744745297.pdfIn PDF document text
    • http://www.xn----9sbkvfu2aex3d.xn--p1ai/ckfinder/userfiles/files/wuwirenopazidegog.pdfIn PDF document text
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/f4c27cd79f920710868281c15c832e23/ritelon.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_off0000b28a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB28A 14424 bytes
SHA-256: 5a8c2eca8ecd5781f3d9c0dac382c4bba53722d07c623fbc2d56b08ec2da7125
font_01_sfnt_off0000d6d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6D8 10800 bytes
SHA-256: ce17b53f432b8c198e9a51ab4dfcb5afe9550565e8b07fad1f2a828627213687
font_02_sfnt_off0000efb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFB4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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