Malicious PDF — malware analysis report

Static analysis result for SHA-256 e2494a979b3c3d0d…

MALICIOUS

PDF

111.7 KB Created: 2021-07-07 07:37:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8937b8d01f7f81c40bb5bd5154c028ce SHA-1: 828d78469668cad62fc473c75f6350bdb84bdf05 SHA-256: e2494a979b3c3d0d81bd12f59131b16ed697f8393660e2188496f23fe66bfe44
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm pointing to numerous compromised WordPress sites, likely intended to host malicious content or phish for credentials. The presence of urgency and download button lures further supports a phishing or social engineering attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9940

Heuristics 8

  • 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
  • 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://krisoc.ru/uplcv?utm_term=couch+to+5k+plan+in+4+weeks
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac386f9dba1---balipidawonirozar.pdf
    • https://lapakunited.com/contents//files/zeliketoxovesem.pdf
    • https://georgiamusicpartners.org/wp-content/plugins/super-forms/uploads/php/files/bc0bebee077643b1dfe869701698f49c/zivopiwetapijowelezupuf.pdf
    • https://vestol.bg/files/file/muforinulupotofegadijatib.pdf
    • http://karat-dobremiasto.pl/userfiles/file/15599499928.pdf
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16083e0970061d---ranozigexixadodo.pdf
    • https://parisautotravel.com/wp-content/plugins/super-forms/uploads/php/files/4bgdp3ampf50utujphtu1og9h6/kemabukesaxafibofagu.pdf
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160e39ae78a327---gemumevubodenom.pdf
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7a68806c3---11780105988.pdf
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607191dd3fb03---40546930915.pdf
    • http://beloezoloto.ru/userfiles/file/43780144339.pdf
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c8efcf3070c---lanoziwegun.pdf
    • https://protrialse.eu/files/files/wefivibefofilulabon.pdf
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081d2601e61c---92027642208.pdf
    • http://syuncyoku.jp/upload/file/lipepiwitudafidujamix.pdf
    • https://utilitydiscount.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607212c4d64f3---jezibezux.pdf
    • http://cheapneasytrafficschool.com/CheapNEasyTrafficSchool/pa/trainstation/uploads/image/file/43661004403.pdf
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/160a952aec157e---96055850783.pdf
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160825a6f77d7f---futonejodojonogapoturiwa.pdf
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098af3ad4071---takitafofibikudirez.pdf
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d88844f7e9---42496700371.pdf
    • https://clinic4lab.com/upload/ckfinder_temp/files/20210701055728.pdf
    • https://dichvumayphoto.vn/webroot/img/files/41887267517.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_off00014d39.bin
d65a89f52c42c393091cbabad214ebb05c5497fee9fd2f3218355c29ad73cf44		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14D39 19252 bytes
font_01_sfnt_off00017ebe.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x17EBE 16792 bytes
font_02_sfnt_off000196d5.bin
a5486a5f7d0526470a3c83c8a03e7ea82c57e28eae03bd0bd0036451871ea007		 pdf-font-stream PDF embedded font (sfnt) at offset 0x196D5 10892 bytes

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