Malicious PDF — malware analysis report

Static analysis result for SHA-256 793df41e8ed464ab…

MALICIOUS

PDF

87.7 KB Created: 2021-06-28 14:22:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3b2de72b03e4551422ab450cb5c0aa55 SHA-1: 86c4bbb033644cdf9de319fdbe163c9902065ea3 SHA-256: 793df41e8ed464abb484bc6f275892ba909e9122ad63122a0c4335481ae42915
164 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites, likely intended to lure users into clicking malicious links. The presence of multiple distinct hosts and the use of UTM parameters suggest an attempt to obscure the true destination and potentially leverage SEO tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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.
  • 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://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/2c01d6dadac517fb4bca694cc793d3d4/56910206755.pdf
    • https://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/fa975619037dfebceec18ada875c5d61/nagipereji.pdf
    • http://www.marcelasemper.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d3a1c9a003a---rerefabanejutu.pdf
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081824ab8662---kavubibowaxipikamavaxejo.pdf
    • http://clinicoral.com/img/userfiles/files/juruwak.pdf
    • https://envomask.com/wp-content/plugins/super-forms/uploads/php/files/2c1aac340d137f65c21835018507c220/dozetamizi.pdf
    • https://cor.org.ar/wp-content/plugins/super-forms/uploads/php/files/uhdnltvsvk2fnie8p7fvomvrh1/fiwipekawubalod.pdf
    • https://olmitek.by/wp-content/plugins/super-forms/uploads/php/files/f0c0agmai0k7mlput2c1vg17r0/28322299086.pdf
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7a58ba1795---rusuredadanojowutixoz.pdf
    • http://manufim.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160bfa490a98c0---gubunotirimu.pdf
    • https://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/70b2c80bc352ced7ef9a7b35265d03a1/70731843878.pdf
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf1d2ac832c---7028532379.pdf
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609d8cb473571---33535147197.pdf
    • http://renovator.cz/files/file/kagomorotekimiz.pdf
    • http://hnkingdee.cn/Files/file/2021531142959.pdf
    • https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/d7d444ae6da1869f6222943d30aa1747/zilavosopusasademuzujo.pdf
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/160bd27ea33d10---rupaxifebojozofosasu.pdf
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c52a5a9b1e4---5122614244.pdf
    • https://bem-sa.com/img/file/66218406841.pdf
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/q6jvj7juosp3qoqdop0sk8s501/fezokibasifajepuwalara.pdf
    • https://betenenergy.com/sites/default/files/file/xubivaliwovanobunezatemu.pdf
    • http://www.jamesbgriffinlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cb667561d1a---54150519296.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=earth+and+space+questions+and+answers
    • 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_off0000f255.bin
aed6a156e3d2c6fff5d40a002439acba2f1059af620c60d359ef6430399379bd
pdf-font-stream PDF embedded font (sfnt) at offset 0xF255 17596 bytes
font_01_sfnt_off0001209d.bin
5693d7e1e8bf71f76c6ae3b9725f944e960bb6a8214875cb02ef4cadb3c4011c
pdf-font-stream PDF embedded font (sfnt) at offset 0x1209D 10880 bytes
font_02_sfnt_off0001398e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1398E 16792 bytes