Malicious PDF — malware analysis report

Static analysis result for SHA-256 55b2ff940841d9c6…

MALICIOUS

PDF

78.9 KB Created: 2021-09-13 02:28:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 02aeedba01bf2873b4bd0e6840be0b2e SHA-1: 2edc47b9ee6c5b043e9dca4891254d10fced450d SHA-256: 55b2ff940841d9c6bd0b2efb6ceb5b5b046f9c7b7c2175f412e45deff280ebe2
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded links, many of which point to disposable hosting or compromised CMS upload directories, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the presence of embedded links and the heuristic findings point towards an attack pattern involving user redirection to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

Heuristics 7

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://edukiya.com/wp-content/plugins/super-forms/uploads/php/files/42a9450fd325855a5d96a010be1d8a5a/49437403626.pdf
    • http://guoyangmoju.com/userfiles/files/zezopenetetupixodota.pdf
    • http://xn--90aoa5aj.xn--p1ai/ckfinder/userfiles/files/70549589884.pdf
    • https://pabxlg.com/userfiles/file/2728661379.pdf
    • http://eco-versute.com/app/webroot/ckfinder/userfiles/files/99138260855.pdf
    • http://vino-charlie.cz/userfiles/file/pedotutisegol.pdf
    • https://genia-groupe.fr/images/files/58415685526.pdf
    • http://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/ac25678d8cef2146e87ad86a719c3f3b/tadodafudiboganamewode.pdf
    • https://md-bud.pl/szklo/photos/file/kilobezisip.pdf
    • http://bekescsaba.varosom.hu/userfiles/files/6678278812.pdf
    • https://virtualpulse.eu/UserFiles/file/vaxipupubobejaxa.pdf
    • http://popnmusic.fr/userfiles/file/18956537889.pdf
    • https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/dc4a3c795b1ee931ae7ba6fa2247c751/95496321116.pdf
    • http://mfcpavpos.ru/file/wilam.pdf
    • https://serka.com/serka/upload/files/90615352696.pdf
    • http://cokhilegia.com/upload/files/88672089769.pdf
    • http://sinsg.com/files/fckeditor/file/sufevubodebege.pdf
    • https://wisserarm.nl/app/webroot/files/userfiles/files/vofazobewim.pdf
    • http://riccaassociati.eu/userfiles/files/dekima.pdf
    • http://compagniaviaggi.gattinonimondodivacanze.it/themes/userfiles/files/niguxivupoxotidunob.pdf
    • https://nic-irq.com/userfiles/files/fanakaxubimabedul.pdf
    • http://modulobase.com/userfiles/file/xulutolabulasibilo.pdf
    • https://www.afoa.org.ar/backend/ckfinder/userfiles/files/bijom.pdf
    • http://benthanhsgfarm.net/images/uploads/files/91075717040.pdf
    • https://goez3.com/10005001208290177/ckfinder/userfiles/files/jaxemebawapoxus.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=general+awareness+questions+and+answers+pdf
    • 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_off0000cfad.bin
cfd758bc0b23f11a79b35d5d8704c9a01f85ce40f1171b5d4654fbbfc5f3231b
pdf-font-stream PDF embedded font (sfnt) at offset 0xCFAD 10864 bytes
font_01_sfnt_off0000e8ba.bin
fcae4b9a3ec8e4d27b55a3952557b029f642be0aa39ee313e4fd7e6a0426a986
pdf-font-stream PDF embedded font (sfnt) at offset 0xE8BA 17328 bytes
font_02_sfnt_off000115b6.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x115B6 16792 bytes