Malicious PDF — malware analysis report

Static analysis result for SHA-256 f21f01148e0ae399…

MALICIOUS

PDF

83.7 KB Created: 2021-07-07 10:08:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 654d4d563af730d5730cc7cc7b23628c SHA-1: 7f38e30e94b096b445d543ee4a6939c1aea3a415 SHA-256: f21f01148e0ae399f72ad88b056e87d0c7e3aab3adb827561141a8d64f35240b
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to potentially compromised websites, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the heuristic findings and embedded URLs are sufficient to infer the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/160c2eb565ff63---52222724541.pdf
    • https://precisionautoandac.com/wp-content/plugins/super-forms/uploads/php/files/839c97ea7083c9ddcb1c3ae276fefb52/zezuxegap.pdf
    • https://laserbeautymachine.net/d/files/81101128549.pdf
    • http://www.contectrade.hu/fckfiles/file/73722425087.pdf
    • http://aksaaydinlatma.com/img/editor/image/file/kematafax.pdf
    • https://erdenet.mn/userfiles/file/6306104231.pdf
    • https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/39e054942271f43f64ecad300cf9fe21/mivogesotewu.pdf
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/8fbad822a5a9f5af7d4fff6ee6795a40/16430527808.pdf
    • https://awlights.com/wp-content/plugins/super-forms/uploads/php/files/aef2973a9894fda77b7f7e95da6a15c2/wapatoturabekozo.pdf
    • http://erbilsunhotel.com/wp-content/plugins/super-forms/uploads/php/files/i28gc0ephempi80o29ojo24mb3/furofovibetef.pdf
    • http://xn--e1aazeoc7d.xn--p1ai/images/shared/file/binufumixiwera.pdf
    • http://laclonghotel.vn/upload/files/zuturesaxazuvenola.pdf
    • http://safeabortionnepal.com/userfiles/file/darimitekimev.pdf
    • https://orkhaconstruction.com/wp-content/plugins/super-forms/uploads/php/files/aigme21vfs5gug59ba57t1ie7g/tasibi.pdf
    • https://mmagame.com/userfiles/file/disazelulafimasido.pdf
    • https://hsse.cl/files/97328183668.pdf
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/37cd59e379e4ab4ed71085fd74b16e46/mezexib.pdf
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/pougf5l2m16v4q52s5ijir00v3/88431137553.pdf
    • https://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/7j19dina6tokb82ov7h6btkm4k/pemanajuwifivokadaniteb.pdf
    • https://gauravkankariya.com/wp-content/plugins/super-forms/uploads/php/files/6pucj712t8lq59rh16k2ndo2j1/11397331429.pdf
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606d3c828fda2---2213023281.pdf
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607c1c30d499a---xelulusi.pdf
    • https://medok18.ru/wp-content/plugins/super-forms/uploads/php/files/aa8f3e381cc3f75e9ba54b56ce82b24e/19113038975.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=standard+deduction+under+income+tax
    • 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_off0000e489.bin
4f4a7ef571202c652d6a2b7d396cd14bc39703399a4d1b7cecad953ac6408b06
pdf-font-stream PDF embedded font (sfnt) at offset 0xE489 17060 bytes
font_01_sfnt_off00011124.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11124 16792 bytes
font_02_sfnt_off0001293b.bin
63eabd6e5ce303796d8b91f57525204094e38d9a6dc0878b2233e38d9e592189
pdf-font-stream PDF embedded font (sfnt) at offset 0x1293B 10592 bytes