Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7b6496abcbfd2a2…

MALICIOUS

PDF

80.4 KB Created: 2021-07-04 02:23:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: aff12c4d0feccc526f097ff73caae852 SHA-1: e023a7f573e5ac290617148c9e60f14db7803122 SHA-256: c7b6496abcbfd2a2da3fcf7375129a109e206a1c64d28148026669bade5bdac2
216 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics suggest it functions as a link farm, directing users to various compromised WordPress uploads and disposable hosting sites, likely to host further malicious content. The 'SE_CALLBACK_LURE' heuristic indicates the document's content is designed to trick users into calling a phone number, consistent with phishing or tech-support scams.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://medvor.ru/uplcv?utm_term=southern+insurance+underwriters+inc
    • https://tailormade-sales-marketing.com/userfiles/file/96290393241.pdf
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ae48cdb9382---62429788126.pdf
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075b01fc4981---70378422841.pdf
    • http://smepil.com/ckeditor/userfiles/files/4592793104.pdf
    • https://beaumont-residence.com/wp-content/plugins/super-forms/uploads/php/files/ct4tf2ch36isqd9dv8dlflau4q/55297181122.pdf
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/160985ea0c8e7e---47841068638.pdf
    • http://lucidareemantenerepavimentifaidate.it/userfiles/files/89713744230.pdf
    • https://technische-dokumentation-hoffmann.com/upload/files/tizizalawexusuluvuwimakom.pdf
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160a8a7c0eae34---kojevevegajat.pdf
    • https://homini.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1609d47d906d2f---lojomifefodines.pdf
    • http://bonapartefamilynetwork.com/clients/7/7d/7d081654635712149502d88e72c54c2d/File/96506219876.pdf
    • https://apparel.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/e98bc8dcb2d2bcbca65dd6c53f8a71c7/88374070678.pdf
    • https://janeunchained.com/wp-content/plugins/super-forms/uploads/php/files/1ts9r7di5ldo3f16ti0fs4cc20/tajanil.pdf
    • https://mygamedaysports.com/wp-content/plugins/super-forms/uploads/php/files/4183f5a20ba86707b94db21723a59cfe/fudetagemiwixax.pdf
    • https://alllegaltask.com/wp-content/plugins/super-forms/uploads/php/files/ov8elbfgmdrci1u2iis4fgpjnh/38036454258.pdf
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/7f83eac829f959b30659874bdecd7e1a/pajejawokukonovi.pdf
    • https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160ab6f5e2d50a---91161077060.pdf
    • https://fellowpeo.com/wp-content/plugins/super-forms/uploads/php/files/bfb9875505644e366db7377a8610bcaa/51286323364.pdf
    • http://purpledoorchurch.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084e8cee1d06---2605136832.pdf
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac504034897---pavisowumemopu.pdf
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609951aa2fd08---lewisodajefo.pdf
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16080a81127c58---pibubimufutaw.pdf
    • https://myclubowners.com/userfiles/files/movaravolaboz.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_off0000cdc5.bin
dacdc38a4cec75b51e4b6455f827ddb7163a90d022222e88c9fa57658653d776		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCDC5 21136 bytes
font_01_sfnt_off00010398.bin
3fc99fdd5459a38cad6411663eee2f587cb6be83e6dc7b0db70b0979f0255776		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10398 10684 bytes
font_02_sfnt_off00011c1a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11C1A 16792 bytes

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