Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab542dd1fbd6d59e…

MALICIOUS

PDF

68.2 KB Created: 2021-09-18 03:12:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: f4595030deacebf6c9645d2f80994901 SHA-1: 956e0a658cb4cf146f36aa866da89e001c3f95ad SHA-256: ab542dd1fbd6d59e4bf6b0ed4c2f455f29812181d883231d53524ad4962a46ca
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF is identified as a phishing lure due to its image-heavy nature and embedded links, a common tactic to trick users into clicking malicious URLs. The document body is heavily obfuscated, but the heuristics indicate it contains a link farm pointing to potentially compromised websites. No scripts were extracted, but the presence of external URIs and the overall structure strongly suggest a malicious intent to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9851

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 68 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://stihoplet.by/upload/editor/files/kazololesabepobinisax.pdf In PDF document text
    • http://montaze.org/democms/userfiles/file/21041751662.pdfIn PDF document text
    • http://kuhomania.ru/ckfinder/userfiles/files/perexotatopofurafo.pdfIn PDF document text
    • http://markasib.ru/ckfinder/userfiles/files/susokejetasolirimebomagon.pdfIn PDF document text
    • http://all4pets.cz/ckfinder/userfiles/files/wupemebiradut.pdfIn PDF document text
    • http://mskabel.cz/UserFiles/File/jifume.pdfIn PDF document text
    • http://oprandi.it/userfiles/files/sifawerujof.pdfIn PDF document text
    • http://mesterteto.hu/userfiles/file/sewemelopuxevu.pdfIn PDF document text
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/d1691ad86d6de7355768fa0ff76a8e48/37004341870.pdfIn PDF document text
    • https://bhsbeacon.com/FCKeditor/file/29942782382.pdfIn PDF document text
    • https://websbag.com/uploads/files/novamotetozanonexateriji.pdfIn PDF document text
    • http://smsalumni1971.com/apadmin/uploads/userfiles/files/45503623510.pdfIn PDF document text
    • http://wenyanchem.com/upload/files/vevud.pdfIn PDF document text
    • https://consurs.ro/ckfinder/userfiles/files/31354551884.pdfIn PDF document text
    • http://short-story.ru/upload/file/83014120199.pdfIn PDF document text
    • https://zenmobile.in/jaipriyart/uploads/files/4119620999.pdfIn PDF document text
    • http://nhadephoanhao.vn/upload/ckupload/files/ketizawokodopib.pdfIn PDF document text
    • http://harposwebdesign.nl/app/webroot/files/userfiles/files/89293754036.pdfIn PDF document text
    • https://www.piramideidiomas.com/ckfinder/userfiles/files/xisekoxupupofodiwewuruj.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/4949cqmkqlkh6aobpag7m8n79r/baginiromunolovutojasi.pdfIn PDF document text
    • http://galettedesrois.hu/userfiles/file/suzumod.pdfIn PDF document text
    • http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/16130443055e65---litivanun.pdfIn PDF document text
    • https://akonis.ch/userfiles/files/lonat.pdfIn PDF document text
    • https://cualuoihoanmy.com/uploads/userfiles/file/49557540134.pdfIn PDF document text
    • http://precisao.net/files/files/82160632816.pdfIn PDF document text
    • http://studiotravenzolo.it/userfiles/files/nofilazugivisubiw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=android+display+on+pcPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b1a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1A6 13920 bytes
SHA-256: 6538c395c8ee9f3db0ffdc8704af6860a695c678b6a4fceb687989687793b358
font_01_sfnt_off0000d400.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD400 10372 bytes
SHA-256: df4b2696e6ce292ca6edf8bbb0887c27b56fbae4074f40380faf794facd5aca7
font_02_sfnt_off0000eb8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB8F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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