Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd170a79a02e1e66…

MALICIOUS

PDF

88.2 KB Created: 2021-07-02 23:09:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 03df237a35f25bb0a1928621d814f08d SHA-1: a1fd62a198c0b6a3dcedaefde8054da7e5fa68b6 SHA-256: fd170a79a02e1e6655eea2f09c4ccee1466bd9367ec1dcf0bb459ed5859b9e83
216 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were explicitly extracted, the presence of numerous malicious URLs points towards an attack pattern involving luring users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

Heuristics 8

  • 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 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://cructi.ru/uplcv?utm_term=banking+mcqs+with+answers+pdf
    • http://asupuro.com/user_data/image//file/72493091265.pdf
    • http://ozona.pt/wysiwygfiles/file/resafuduxezuxusorixifelat.pdf
    • http://vilaportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ff95bcea76---71894132888.pdf
    • https://atamergranit.com/userfiles/file/gewezaxatikozes.pdf
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/9cd033c9c9e18d5d7a36ec79de039267/buzowelutoxafono.pdf
    • http://sevoir.hu/uploads/file/93740398475.pdf
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/86rf3cb7qpvlr0e5isvkn4ir03/kopebi.pdf
    • http://vieclamquantri.net/upload/files/92551475123.pdf
    • http://allprintusa.com/admin/images/file/45824508155.pdf
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/7mpbcliqffgd9ikf98j4sn3b94/fijituguzimigilisugu.pdf
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/bcnj7q6h2vggpgpdil4md7v026/dasozuwonat.pdf
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/0a0a3db62d8fddfc45d001a111f9a995/vesizevipejix.pdf
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/160725fa9d7d85---jumarilesafafabiw.pdf
    • https://member-amz-seller-system.de/wp-content/plugins/super-forms/uploads/php/files/3ddad7a2b82869f88c0d88a181c19f85/43593756479.pdf
    • https://guijek.com/userfiles/file/39627426412.pdf
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609e48ff6a5d0---junavim.pdf
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfc1cb961de---wolanogewojasi.pdf
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/160856a75ebd36---61069749829.pdf
    • http://springswellness.net/wp-content/plugins/formcraft/file-upload/server/content/files/16071db0fc6175---pulemixijuda.pdf
    • https://espaciocultivarte.com/ckfinder/userfiles/files/redimoxu.pdf
    • http://alnadaoil.com/userfiles/file/vedem.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_off0000f45f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF45F 16792 bytes
font_01_sfnt_off00010c71.bin
26e487a7e74ba9896c69fdb2bf73748d0d84f2f28bd14980e7d4cae2f0306cec
pdf-font-stream PDF embedded font (sfnt) at offset 0x10C71 17352 bytes
font_02_sfnt_off000139d5.bin
74052bc13aa33c666ce3d1db2bc72d27e60cf95ef888edfdaa8c952547e90b9b
pdf-font-stream PDF embedded font (sfnt) at offset 0x139D5 11280 bytes