Malicious PDF — malware analysis report

Static analysis result for SHA-256 1131f4785dacca55…

MALICIOUS

PDF

92.2 KB Created: 2021-06-29 14:52:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 94527503625be633c3c65b6c529cc74c SHA-1: fa7fd0942e05fa97960000db54ef7d1e204ba576 SHA-256: 1131f4785dacca556b2175f217a2dc106156d46cfa2e638ca7bece611d929f16
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple compromised websites, suggesting an attempt to trick users into downloading further malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the nature of the link farm and the presence of embedded URLs suggest a phishing or malware distribution workflow.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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
  • 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.
  • 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://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/dc584f8fbebfa7481761a81033c772a4/75805158672.pdf
    • https://bbensonmft.com/wp-content/plugins/super-forms/uploads/php/files/191ca265405219457a194934a273dd87/15027709931.pdf
    • http://www.orhancoskun.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c13f3af1c99---24419459894.pdf
    • http://baigeleather.com/userfiles/file/24308303640.pdf
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a7765797b0e---mowepefilo.pdf
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086bc5fba5d3---zilazeremolajugizufaxedi.pdf
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a156405c66f---kepikikasamizesel.pdf
    • http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/ktppi06hj1mi03pju24psfveo0/bofazosaguvexufemeguget.pdf
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/16072d5fd225e6---zujevapegosisijukem.pdf
    • http://manixcnc.com/ckupload/files/gevewilasomijisalojit.pdf
    • http://attlas.center/userfiles/file/ruvonip.pdf
    • http://manninareunion2012.com/clients/0/03/03b30fdf9aaeeba733afadbef254ff7b/File/dixiv.pdf
    • https://bindazzled.com.au/wp-content/plugins/super-forms/uploads/php/files/8bf1bf7bb08b6991914e5755d0460b25/82321832299.pdf
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608112be5b4bc---fatus.pdf
    • http://nuestratierrapremios.com/campannas/file/66546946362.pdf
    • http://botosani.ro/img/uploads/file/3575218593.pdf
    • http://logiccpacma.com/ckfinder/userfiles/files/lefijuworolaxipabaxanugo.pdf
    • http://designbeginnings.com/upload/file/8702366406.pdf
    • http://mt-filtration.com/uploaded/file/145007952460c44cd530e32.pdf
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/ab57bf8bc94709f0fd19041526721a9b/2521332611.pdf
    • http://clinivetmadonnadirosa.eu/userfiles/files/xotuwawonatejop.pdf
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/16099a052c71a8---90175431439.pdf
    • http://beiks.info/public/file/26551132726.pdf
    • https://www.nrlandscapes.co.uk/wp-content/plugins/super-forms/uploads/php/files/702b56ea441bba90bd34ad0ac349453c/binufoz.pdf
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/pegm8qva6fr0g13dior044g2ls/27660536992.pdf
    • https://whiteelephant.co.in/wp-content/plugins/super-forms/uploads/php/files/572832a1118170a22f924bf575f1016c/dajejita.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=kinemaster+download+for+pc+without+watermark
    • 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_off00010216.bin
fdf842e2e158baac0c05ad851659ef112d4922a98ca5b77b2ad5d265f6dc2bd1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10216 17864 bytes
font_01_sfnt_off00013134.bin
51b4418625158e72d733fb5badd7c2e480dc626c84440f36590ec7168ebbe540
pdf-font-stream PDF embedded font (sfnt) at offset 0x13134 11152 bytes
font_02_sfnt_off00014b23.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x14B23 16792 bytes