Malicious PDF — malware analysis report

Static analysis result for SHA-256 c895c4544612b51b…

MALICIOUS

PDF

79.9 KB Created: 2021-09-08 09:12:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 5b7ad82c39815243ca947992a5247e49 SHA-1: ad82c2968dbe2e0fbf9f688b4e628ddd6696b206 SHA-256: c895c4544612b51b6686315ef1c93f5428c38b3ed2a0e62f5864795b5a17b143
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged by multiple heuristics as malicious, including a critical ClamAV detection for Pdf.Phishing.Trojan. The document body is heavily obfuscated, but the presence of PDF link farm heuristics and a callback lure suggests a phishing or scam attempt. The document likely aims to trick users into calling a fraudulent phone number by impersonating a legitimate service or authority. No scripts were extracted, but the PDF structure itself contains numerous embedded URLs pointing to potentially compromised websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 http://bmsorganica.com/userfiles/file/15905187929.pdf In PDF document text
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160878e9ac813f---mejisepuwefin.pdfIn PDF document text
    • http://munnarinfo.in/userfiles/file/gigasenidokod.pdfIn PDF document text
    • https://wentworthre.com/wp-content/plugins/super-forms/uploads/php/files/f445f98306348d1a3b43b9e99390fa69/midazofasu.pdfIn PDF document text
    • http://supair-lux.hu/ckfinder/userfiles/files/24855675876.pdfIn PDF document text
    • https://marksiegeldds.com/wp-content/plugins/super-forms/uploads/php/files/abca95335d37e998e6b3802f8d76b5e3/vanuxo.pdfIn PDF document text
    • https://pet-fashion.ro/mm/file/31040437772.pdfIn PDF document text
    • https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/ebb352b99def60e6388f285e843194b0/73512964978.pdfIn PDF document text
    • http://tvkinter.com/file_media/file_image/file/70550392530.pdfIn PDF document text
    • http://katour.ru/admin/ckfinder/userfiles/files/37197423718.pdfIn PDF document text
    • https://www.femregenx.co.za/wp-content/plugins/super-forms/uploads/php/files/3chlq9ar8eq2kc5k0dr3o0ufcb/pebijitufitoku.pdfIn PDF document text
    • http://businessplan-capalpha.fr/mbp/upload/images/images/upload/ckfinder/42478996762.pdfIn PDF document text
    • http://webbuilders.com/files/file/tufodizubavidupuwizowip.pdfIn PDF document text
    • http://cachnhietwin.com/luutru/files/81109957139.pdfIn PDF document text
    • https://carlojans.com/cms/file/72062349301.pdfIn PDF document text
    • http://nfc.soo.jp/file/11121192028.pdfIn PDF document text
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/16070fd4b25090---42856280866.pdfIn PDF document text
    • https://soportedevida.mx/ckfinder/userfiles/files/1263225836.pdfIn PDF document text
    • http://brothersaluminium.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/1608a35515635a---44174324113.pdfIn PDF document text
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/16091ce5deed1f---15472420807.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f036c242ee---74490252382.pdfIn PDF document text
    • http://www.zulfugar.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607c145d06b85---19206580173.pdfIn PDF document text
    • https://thejinglelab.com/wp-content/plugins/super-forms/uploads/php/files/caof434hov58n1meab8am6b3f5/mejuraruweti.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=gta+5+cheats+ps4+deutsch+pdfPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d4b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4B6 10604 bytes
SHA-256: 3110086ec832d5eac1b494c0a74f9c6d05b7ad20a268eecc21df7a3ccf2db447
font_01_sfnt_off0000ed3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED3A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001054c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1054C 17320 bytes
SHA-256: 9ab7f02d7ba3c7cfe966d4c45551d05d0a722c598997d936ed1f663fbe380c0b

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