Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1003f1fa14e192a…

MALICIOUS

PDF

87.8 KB Created: 2021-07-04 23:07:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d5019f3796fa7c616c8db9d4e63e9e2a SHA-1: ec0902706a5a0aaa7a40d5a17c749f98dea01c4c SHA-256: c1003f1fa14e192a05c163cdcaf80852dd9723693a8709d7f680f5f540211835
156 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 document functions as a link farm, containing numerous URLs pointing to compromised WordPress upload directories and other disposable hosting. These links are likely used to redirect users to phishing sites or download further malicious payloads. No scripts were extracted, but the presence of multiple external URIs suggests a phishing or content-luring attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://crewmak.ru/uplcv?utm_term=chic+and+pete%27s+near+me
    • https://krimgranit.ru/wp-content/plugins/super-forms/uploads/php/files/e47df2806a85c3b0adf59216d2d2a3f8/sanubasazinuxudurevixosi.pdf
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a48e0157029---gerewozarag.pdf
    • https://iescolumbus.org/wp-content/plugins/super-forms/uploads/php/files/52a5d7c5edd0085dbbfa2fe927ddbc6d/diwopuzusezeludupaxupudi.pdf
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160a4d6e89e9eb---87357149101.pdf
    • https://www.aceitedeoliva.com/wp-content/plugins/super-forms/uploads/php/files/b732ff67f67a421dc892dc32949c584c/21416508537.pdf
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/86cc93fe2ed48b5b19b89fcf70652c16/44067476554.pdf
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/1607d9833e062e---gijuronuwuj.pdf
    • https://manenshop.com/upload/files/fakogiduvivemo.pdf
    • https://fzclicks.com/demo/files/editor/file/49056521789.pdf
    • http://dzstock.com/Upfiles/file/11650695228.pdf
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b290b5bc2bd---gosixo.pdf
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ac0a268484---gemijugapifiluwo.pdf
    • http://robwalker.net/fckupload/file/webiketazobaluvagurodarem.pdf
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8e8813ad3---40437733846.pdf
    • http://kraski-chernila.ru/resources/file/kijug.pdf
    • https://arrayamed.com/userfiles/file/4681390696.pdf
    • http://monkey-do.net/userfiles/file/vexitopagag.pdf
    • http://simonide.org/userfiles/file/75446324021.pdf
    • http://nagymester.com/userfiles/file/67544191107.pdf
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e386bb1f2e---namadefosurevimageguxil.pdf
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160b4760db3f1b---80496846188.pdf
    • https://charlesstreetvideo.com/userfiles/file/41335719008.pdf
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606f5165082ec---gunimodujexo.pdf
    • http://yaqeen-eg.com/userfiles/file/xezojumubakaseriwev.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_off0000ee5a.bin
dd29a12b39f27dfd0c13f5683dec41a1a83865651f15e2cfa6062c35b70cae1e
pdf-font-stream PDF embedded font (sfnt) at offset 0xEE5A 10680 bytes
font_01_sfnt_off000106b5.bin
3b6c55f483b1b16efbda6cc2450e6d9f4a2a9969a68f73156d0f4d5d4a6043f9
pdf-font-stream PDF embedded font (sfnt) at offset 0x106B5 19232 bytes
font_02_sfnt_off0001385d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1385D 16792 bytes