Malicious PDF — malware analysis report

Static analysis result for SHA-256 d62d71d632223c94…

MALICIOUS

PDF

72.0 KB Created: 2021-09-12 10:50:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: da541fa95df472c1a39f8a60434d148b SHA-1: a43853733e180d8835344ed5a9c9a7d993aaaed1 SHA-256: d62d71d632223c940a36832716fc5c1f79ff945470e444c017e4be1335ebe84f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery through these links. No scripts were extracted, and the document body was unreadable, so the attack pattern is inferred from the URL heuristics and malware detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 6

  • 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.
  • 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://bdaudit.ro/userfiles/file/folunogogitamuvebexu.pdf
    • https://arerp.kr/data/file///74484379339.pdf
    • http://www.santabriganti.org/admin/ckfinder/userfiles/files/rixumaponujidi.pdf
    • https://budapestpainter.hu/ckfinder/userfiles/files/fojililusimas.pdf
    • http://backupcenters.com/userfiles/file/85662264510.pdf
    • http://charontrade.hu/data/file/35297562635.pdf
    • https://rawoctane.com/uploads/file/jarutoxafubaguxe.pdf
    • http://motopujcovnateplice.cz/userfiles/file/wovosivedebo.pdf
    • http://vladjurnalist.ru/archive/file/61635542579.pdf
    • http://pereplanirovkaoblast.ru/pict/file/xezanofuvuguzujarigelik.pdf
    • http://josepholszowka.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/50948836810.pdf
    • http://vectorma.ru/uploads/assets/file/tizexalawiduz.pdf
    • http://goddesshair.net/upload/users/files/46060436265.pdf
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16134ae77d210a---30578311251.pdf
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/161367fe43c0d5---sadere.pdf
    • https://turkuazhost.com/calisma2/files/uploads/povegul.pdf
    • https://satybharat.com/ci/userfiles/files/tugupixavurafej.pdf
    • http://dakdekkersindex.nl/images/uploads/bagapubazakejibidoj.pdf
    • https://serrechevalier-skifun.com/imagesfile/29875617794.pdf
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137b6f231f11---48936176297.pdf
    • https://fairtradeportal.pl/userfiles/file/56143901775.pdf
    • http://tkhomedeco.com/assets/uploads/ckedit/files/20210905055504.pdf
    • http://timebymtm.com/upload/files/67601059773.pdf
    • http://pegasomeeting.medcoast.net/ckfinder/userfiles/files/bigogivetijinad.pdf
    • http://scoutpate.com/userfiles/file/75424487246.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=how+to+transfer+music+from+android+iphone
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b83a.bin
905b68b2fe674cc28c7275b6eee9f33cc75feeb90712a39b2666b1b23bfb74b8
pdf-font-stream PDF embedded font (sfnt) at offset 0xB83A 11016 bytes
font_01_sfnt_off0000d1a9.bin
2c9140dc8b5146842ca0f1b29017fc1098a60d9d3f6b5f7c07cc7ca775ce97a0
pdf-font-stream PDF embedded font (sfnt) at offset 0xD1A9 15836 bytes
font_02_sfnt_off0000fa23.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFA23 16792 bytes