Malicious PDF — malware analysis report

Static analysis result for SHA-256 dbcf8b2ef087201e…

MALICIOUS

PDF

78.7 KB Created: 2021-06-29 15:10:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7fbdc10173a7c442cb0e57a308b9e2f1 SHA-1: 53813ed56e889e1cbd95e9abccd52c0a37bdd5a5 SHA-256: dbcf8b2ef087201e083ca4ad549321ddd12040e7362781c51a3b38d420bfca7c
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, exhibiting characteristics of a callback phishing or tech-support scam. It contains numerous links to external websites, many of which are hosted on compromised WordPress sites or disposable domains, suggesting an attempt to redirect users to malicious content or phishing pages. The heuristic 'SE_CALLBACK_LURE' specifically indicates the document's intent to prompt the user to make a phone call, a common tactic in such scams.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 7

  • 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.
  • 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://infrive.ru/uplcv?utm_term=genesee+county+friend+of+the+court
    • http://ifa-astrologie.de/userfiles/file/xuloduvidarejovi.pdf
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16076e63be063e---18359100040.pdf
    • https://www.finestkindcharter.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0d0da235bb---6505492442.pdf
    • https://careersourceokaloosawalton.com/files/public/dafodejikojolurewav.pdf
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4ff6e0839b---67177014300.pdf
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a47b2a071f8---mepogomok.pdf
    • https://ilc.ua/wp-content/plugins/super-forms/uploads/php/files/iqsen7ojlc3rbjm5etv3n94nv3/bidusexejona.pdf
    • http://grupogmec.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c99dfc1301---logazimevogopewalu.pdf
    • http://czdashan.cn/uploadfile/file/2021052515253273499.pdf
    • https://www.rydalmereprestige.com.au/wp-content/plugins/super-forms/uploads/php/files/34q75521hb3hka9hljice74n69/57111242933.pdf
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/8b77b4a89e79b9f26162e2acef0c2dcf/26311941866.pdf
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae6b05b7cbf---20881366137.pdf
    • http://toyteepee.com/uploadfiles/file/210510162753537577zdmsoj.pdf
    • https://kodcomputers.ro/2664/uploads/53620249613.pdf
    • http://prograsifkalip.com/files/69088212662.pdf
    • http://fotografoenricogiampieri.it/userfiles/files/48330529742.pdf
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/160b5cc70ad9bc---75315362766.pdf
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/abee3ac0afece103aa20358de27ddfb3/34282551702.pdf
    • http://goldmustang.com/files/files/56363104483.pdf
    • https://unosms.us/userfiles/file/26516583980.pdf
    • http://comp-art.ru/userfiles/file/xifov.pdf
    • http://www.bluewhaleline.com/image/upload/File/lixugafazu.pdf
    • http://www.festivalmarrakech.info/wp-content/plugins/formcraft/file-upload/server/content/files/160d4e21a8f550---92396840358.pdf
    • http://hillsdale66ersreunion.com/clients/c/c6/c679c52642bc64dd8629b98fb95ccc77/File/98869524508.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_off0000cf31.bin
209e410ac19eac3b71d663489fc62f0f946cf1a963dae4f6021832cada169d7a
pdf-font-stream PDF embedded font (sfnt) at offset 0xCF31 10620 bytes
font_01_sfnt_off0000e774.bin
f155a8f606f7a3f60a45516ab0d6513a7c0a596a0f061568d1dff75d5f5adc89
pdf-font-stream PDF embedded font (sfnt) at offset 0xE774 16928 bytes
font_02_sfnt_off00011380.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11380 16792 bytes