Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ca3f92d76a51c86…

MALICIOUS

PDF

84.9 KB Created: 2021-06-26 18:52:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f939e375ed2e562eacbfbaf0e3e1c381 SHA-1: 976c1c9831d38fe40dc9d5b4d6f6aa0f6f0aadcf SHA-256: 6ca3f92d76a51c868f3253b1f66a0679dff8af54f0c0c18f51efe14021a4eb2f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URIs and link farm patterns, suggesting it is designed to redirect users to potentially harmful websites. The presence of embedded URLs and the nature of the heuristic firings point towards a phishing or malware distribution scheme, likely initiated via a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 6

  • 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.
  • 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://philabc.ru/uplcv?utm_term=hello+neighbour+android+apk
    • https://mosconi.net/userfiles/file/89826458702.pdf
    • https://bestcoloringpages.com/userfiles/file/77910339927.pdf
    • http://audiencefertilization.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/20096308317.pdf
    • https://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/3dbe2a4ab5c6b6436fa638ef958c900c/momup.pdf
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609aee870d0f0---74992068399.pdf
    • https://nestaerospace.com/uploads/file/35976650339.pdf
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b1f86e476c---napet.pdf
    • https://yastudio.net/wp-content/plugins/super-forms/uploads/php/files/bdad11fe58a68efdae866eec1a058069/31634243922.pdf
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9944d53cf2---fifodegaku.pdf
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/2f485b4098bb975978d24d1504732e03/85886295954.pdf
    • https://tlpnw.com/wp-content/plugins/super-forms/uploads/php/files/3a2334840d357680a7b11d82e273f50d/80595890748.pdf
    • https://bikeid.net/ckfinder/userfiles/files/pufufaxubulugupabi.pdf
    • https://www.swx.global/wp-content/plugins/super-forms/uploads/php/files/68ab9dc604d5c713d0ec16792f8d1180/lalanixofugiruk.pdf
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16087aec4976fe---40675072532.pdf
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b88571eb5ea---xumegabomiku.pdf
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1609be0760fcc5---31060020613.pdf
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608c91f84c143---41090716960.pdf
    • http://madmojo.com/fckupload/file/lovenimepuk.pdf
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/dcdddab790b6c1df0405f4ad43bdf924/fovigosavomo.pdf
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d64dee086af---tomobuwarobaluvisivodofiv.pdf
    • https://investainternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160826f94024c3---gifapuzezevaro.pdf
    • http://delawaretravelmedicine.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080e9d3a0405---3578212246.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_off0000e977.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE977 16792 bytes
font_01_sfnt_off0001018e.bin
91708287e623761b10c52f17fcc89548bbae10ce6e6611dce486cc11b1d8cb28
pdf-font-stream PDF embedded font (sfnt) at offset 0x1018E 10728 bytes
font_02_sfnt_off0001198f.bin
0ccf608bb7cc4dc1616d3e2868b6ae83d5f84256d8a081594d51ca4ef5d55ed7
pdf-font-stream PDF embedded font (sfnt) at offset 0x1198F 17104 bytes