Malicious PDF — malware analysis report

Static analysis result for SHA-256 7fbb90f64e035708…

MALICIOUS

PDF

88.8 KB Created: 2021-06-28 12:52:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 865b38fb00c442f2e9fe68d9a7405a82 SHA-1: d626238432b35f1dadbb519fa3f4395df8273f0d SHA-256: 7fbb90f64e035708a9152996c6e5e4657d5cc8349ceed735710a44bf332e0792
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm containing numerous external URIs, many hosted on compromised or disposable domains. The PDF structure and embedded links suggest it is designed to lure users to external sites, which could host phishing content or further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 6

  • 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.
  • 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://newtrierreunion1962.com/clients/6/64/64567561842b0bbd40b956adda0282a7/File/75791273467.pdf
    • https://frontiersneurophotonics.org/wp-content/plugins/formcraft/file-upload/server/content/files/1/16087d481d6455---42485476943.pdf
    • http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160999115606c7---84427983439.pdf
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/160725d3774515---wisoxaf.pdf
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/f79564e75083113da94e089e1aa783f9/pipadisovuxova.pdf
    • https://abyway.lv/images/ck_images/files/pazafepe.pdf
    • http://akgikorea.com/file_upload/fck_upfile/file/41803957358.pdf
    • http://hzqzg.com/d/files/jelomojigib.pdf
    • http://aggengr.com/uploads/CMS/file/80780560715.pdf
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/s09smn0vgr03ek4f91jj7uut00/kidabivamibavatixusi.pdf
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080876cbebe1---40057373260.pdf
    • http://bizbecho.com/pa/trainstation/uploads/image/file/kivixusosefisegejabemawim.pdf
    • http://fobas.cz/userfiles/file/8079981757.pdf
    • http://amandatravel.com/userfiles/file/borulosatosijixufigup.pdf
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16080916c07a1c---51194494631.pdf
    • http://studiozammuner.eu/userfiles/files/62742031174.pdf
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/16099fd3870a17---87058097851.pdf
    • http://kawoka.com/userfiles/file/8287876870.pdf
    • http://fructusartis.com/i/File/pivav.pdf
    • https://graffitipaintstudio.com/wp-content/plugins/super-forms/uploads/php/files/5b75f339a584c7867d3aaec14ad7a7bd/nigajukosogubozupomed.pdf
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606c959163d57---18050521450.pdf
    • http://jullien38.com/ressource/site-image/files/64182342034.pdf
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/eq2h7ba99trlngds2vu0te1q8p/59846996775.pdf
    • https://cald-lighting.com/wp-content/plugins/super-forms/uploads/php/files/e4e765a58ad0120f6d21f9c1d23adb62/68528072018.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=ch3%2B+lewis+structure
    • 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_off0000f972.bin
871ce24ab74d0bcd8de9ecba5e1bfe99bac9cec96253b8d65b3f9b00999c61d7
pdf-font-stream PDF embedded font (sfnt) at offset 0xF972 10332 bytes
font_01_sfnt_off00011102.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11102 16792 bytes
font_02_sfnt_off00012914.bin
6311a6816e9fbef0ce4237c5ab6280308ba33e7ac506ebcc3da2c894731b0c7d
pdf-font-stream PDF embedded font (sfnt) at offset 0x12914 17416 bytes