Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2e31bb0fe8e34b2…

MALICIOUS

PDF

109.8 KB Created: 2021-09-15 15:23:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 822cc464256e3cf1a182a988012fa937 SHA-1: 88e51d6bd905fd05af61ffbc0f2448893d100965 SHA-256: a2e31bb0fe8e34b2df97f2ea0666c01644d2ef5513551875825603c31db85c5b
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and link farms hosted on potentially compromised or disposable domains, strongly suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection further support its malicious nature. While no scripts were directly extracted, the structure and URL patterns are consistent with a malicious PDF designed to trick users into downloading further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://wastran.ru/uplcv?utm_term=physics+2nd+year+pdf PDF link annotation
    • https://msvadba.ru/files/file/7525152336.pdfIn PDF document text
    • https://matfplayer.com/calisma2/files/uploads/86831086968.pdfIn PDF document text
    • https://sapsda.com/SapmaUserfiles/file/letaxevetoxapogorexifak.pdfIn PDF document text
    • http://sushibelovo.ru/files/tisidun.pdfIn PDF document text
    • http://chamdure.com/DATA/files/47754216313.pdfIn PDF document text
    • http://zrdb-drogbud.pl/Upload/file/93469586096.pdfIn PDF document text
    • http://dpsnowodworze.pl/userfiles/file/19505564282.pdfIn PDF document text
    • http://kaushalacademy.org/ckfinder/userfiles/files/sujojeme.pdfIn PDF document text
    • http://amdind.com/userfiles/file/22764646117.pdfIn PDF document text
    • http://mikailang.net/userfiles/file/20210908121407_93218929.pdfIn PDF document text
    • http://phamtrangia.site/upload/files/wunaponovenufilunuxuk.pdfIn PDF document text
    • http://haliburtonhighlandsheritage.ca/userfiles/file/86010822742.pdfIn PDF document text
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/161418f4417718---gutiseve.pdfIn PDF document text
    • https://lbjgold.in/ckfinder/userfiles/files/48700839694.pdfIn PDF document text
    • http://gulfcoastlist.com/userfiles/file/28300822735.pdfIn PDF document text
    • http://snft.ro/media/file/venafajuji.pdfIn PDF document text
    • https://rosenstein.lu/userfiles/files/1234020299.pdfIn PDF document text
    • http://www.mostex.sk/files/articles/file/xawuwigisukawesasexovi.pdfIn PDF document text
    • http://atreve.eu/ubezpiecz/obrazy/file/buwuguxorajumijulezopisi.pdfIn PDF document text
    • http://vdtonline.vn/static/uploads/editor/files/58294820293.pdfIn PDF document text
    • http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/161403ee18b250---59195106763.pdfIn PDF document text
    • http://datcat.vn/2018/file/barunotuvexof.pdfIn PDF document text
    • https://ht-cooling-j3t.com/contents/files/72695981536.pdfIn PDF document text
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/1614015d7e4a9d---rolanisokaduvemadosamux.pdfIn PDF document text
    • http://liweisteel.co.th/ckfinder/userfiles/files/rotawuwakewijosukuwej.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_off00014619.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14619 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00015e2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15E2B 19248 bytes
SHA-256: f377dd23fd217cd0b7d690962de44171b5963028e35836c1a39f56555af44b8b
font_02_sfnt_off00019133.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19133 10688 bytes
SHA-256: 88c72b2c81b4947127f957b532db0d94d0f6775e958a2b86e5cda8d34ac8959c

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