Malicious PDF — malware analysis report

Static analysis result for SHA-256 4665faefb308bee4…

MALICIOUS

PDF

105.8 KB Created: 2021-08-06 13:21:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ccdb6492658f71177b1f9b7ed30abeee SHA-1: 452cfb258bc791464e2ecd0d81bcfeb522c6a10c SHA-256: 4665faefb308bee467b70f29d8e781219bf55c7756d881e7b9204f70c69de493
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous URLs that point to compromised WordPress sites and other disposable hosting. These links likely lead to phishing pages or further malware downloads, indicating a malicious intent to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9895

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 https://thetitangroup.ca/wp-content/plugins/super-forms/uploads/php/files/8c9e04913fd16fd015a090b1f9fc8885/weneg.pdf
    • http://kengosushionlineorder.com/uploads/files/49672391529.pdf
    • https://www.opdrrustukalac.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073afa04e9a3---kekuralorer.pdf
    • http://lpkgoodframeupvc.com/userfiles/files/76424532497.pdf
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/9ba51b7bb4260320af9055317dc68448/14753810011.pdf
    • http://am-assets.com/aom/magnolia/userfiles/file/53237097513.pdf
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a24dbf94551---diketezeguwijorifiziropo.pdf
    • http://a2itsolutions.com/chop/multimedia/userfiles/file/72693586209.pdf
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160796246ef986---57433502311.pdf
    • http://amako-ra.com/wp-content/plugins/super-forms/uploads/php/files/b4e5f65a6c100ed422a1dce89b6cb84c/27099977032.pdf
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160962821b1bf9---tekezelaxujanatofosegesa.pdf
    • http://beytarimcilik.com/admin/editor_resim/file/kigusukedud.pdf
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/pehorjj46idbbomk2470kv2s67/dokinogakofiwujefetep.pdf
    • http://wjvanderheidedienstverlening.nl/uploads/file/lavatuka.pdf
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/160d65c5984f17---bedonabomolusomavakuji.pdf
    • https://t2sc.me/userfiles/17530798603.pdf
    • http://architettoangeli.it/userfiles/files/14699813568.pdf
    • https://workinhotel.com/upload/fckfile/sopurinaserewozo.pdf
    • https://tyeetomsfishing.com/userfiles/file/vibidusisu.pdf
    • https://szekszardportal.hu/userfiles/file/vevunow.pdf
    • https://nikosdimos.gr/userfiles/file/94936839803.pdf
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/160efd4ca86c9b---22290854594.pdf
    • https://aviseco.ro/userfiles/file/nirilosupej.pdf
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/1fc9e9b9bc4e72492e555fcd1cc4d17a/82698056194.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=ffxiv+carpenter+level+50+quest
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001210d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1210D 16792 bytes
font_01_sfnt_off0001391f.bin
9ba9910493c5d11fbc9796827f1cc81279c172b0c22c04785d621b0622bb09de
pdf-font-stream PDF embedded font (sfnt) at offset 0x1391F 18400 bytes
font_02_sfnt_off000169bc.bin
4836aee28004624751af1e7542ea2670658cc74ea0ee7eee0e7bd01789fb729c
pdf-font-stream PDF embedded font (sfnt) at offset 0x169BC 11000 bytes
font_03_sfnt_off00018384.bin
9d5144547e0b729630886a3ad3ce48e7da84b0115899dd9c2390406af6f0fecd
pdf-font-stream PDF embedded font (sfnt) at offset 0x18384 16092 bytes