Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e5b4edb24fc94ad…

MALICIOUS

PDF

101.7 KB Created: 2021-06-26 06:45:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: bf04665ecd5037c7dbe9c859b96bea0b SHA-1: dc944293da2ba3d8fd3310e0892e3f5b0486e12f SHA-256: 3e5b4edb24fc94ad57adc31e7e046364800098d26046c610b47162f09f4c67cd
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links to compromised WordPress sites and disposable hosting, suggesting it is part of a link farm designed to host malicious content. The document's structure and heuristic firings indicate it is intended as a callback phishing or tech-support scam lure, prompting users to call a phone number.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9887

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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://cructi.ru/uplcv?utm_term=ibs+foul+smelling+gas
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/16086081c00205---1953368087.pdf
    • http://www.redactordecontenidos.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160bcf319cae78---xugetiropufadajixotusevuz.pdf
    • https://kindliving.org/wp-content/plugins/super-forms/uploads/php/files/tmp/viladewinebalorixavaka.pdf
    • https://pankalconstructora.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ec3fd02abb---75636596360.pdf
    • http://usmleworkout.com/files/file/48671202305.pdf
    • https://arihantgranites.in/wp-content/plugins/super-forms/uploads/php/files/ho20tj36pe46j689toq3db57u1/80764982480.pdf
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087259868861---28838426305.pdf
    • http://gelikonline.ru/content/Files/barixudomajevoxu.pdf
    • http://www.supercarrentalsofmiami.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f6643e0e28---38658591141.pdf
    • https://www.indee-r.fr/wp-content/plugins/super-forms/uploads/php/files/487b41b809a3df08aed02769a965cee0/43913877851.pdf
    • http://fujavietnam.com/images/Download/jologusos.pdf
    • http://www.predia.cz/userfiles/file/betivuduzumagumunaweviju.pdf
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/c5784b1702322fb8a76cd505c5195e5e/nutekesalemepumedaguba.pdf
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/44e3a33dc68d67a4fe88cd4712c30886/xazutetibavodeguri.pdf
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b59ae727627---58853097886.pdf
    • http://sosnovgeo.ru/userfiles/file/darumet.pdf
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608773e88ae73---86602302917.pdf
    • https://ebooksweb.net/files/file/wetejijupi.pdf
    • http://holmeslawfirm-iowa.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/58055263010.pdf
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2509528994---27944036391.pdf
    • https://nocenzura.space/web/img/podborky/files/xudowalazajajufi.pdf
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f7192b6698---15381391070.pdf
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c2eb6033027---vopuf.pdf
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160a4744e3e483---91558366099.pdf
    • https://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/89knqd2md45oca2g2mpcp2cbg2/52423851256.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001161b.bin
ef5e3b3571cf4dc0f6519222a88b19912fcad33a2c43b6ffd07cb8bec610ef77		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1161B 10548 bytes
font_01_sfnt_off00012e15.bin
6d568972154aa9e6553788066da68fe6d5b0b58db67a92e881fdc4c3770f4e1b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12E15 16252 bytes
font_02_sfnt_off000143e3.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x143E3 16792 bytes
font_03_sfnt_off00015bf5.bin
079bac30d2a64b2cf1fad9a94636a62c447b57cb1d504a5e96f9e2b0652cefb3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15BF5 16924 bytes

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