Malicious PDF — malware analysis report

Static analysis result for SHA-256 75d00294fb1d50d8…

MALICIOUS

PDF

81.5 KB Created: 2021-09-13 10:50:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 77b32317c8f0d2256831edbefce94df3 SHA-1: 29da096809e529d5f655b3c2703a90155d515b9f SHA-256: 75d00294fb1d50d889a4cf4714c229a2613bbda7033c184c077adfcc966633ea
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as a malicious PDF by ClamAV and an ML classifier. It contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS uploads, suggesting a link farm or phishing lure. The presence of external URI heuristics and the ML classification strongly indicate malicious intent, likely related to distributing further malicious content or phishing for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://crosswaysrecruitment.com/userfiles/file/73098320784.pdf
    • http://jsjxh.org/filespath/files/20210904123505.pdf
    • http://dgone.kr/userfiles/file/20210909060415.pdf
    • https://inchirierielicopter.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613cadb79e02f---87933778421.pdf
    • http://servmed.net/userfiles/file/liluxegom.pdf
    • https://agmatbaa.com/upload/files/pagoforubisitowedebexar.pdf
    • http://eyela.kr/uploadfile/fckeditor/file/83315568611.pdf
    • https://tiemhoamo.com/data/dulieu/files/27013772558.pdf
    • https://unique-u.biz/images/uploads/file/jojepuxagevidilegonuwikiw.pdf
    • https://gymlesgeants.com/upload/editor/file/59879959391.pdf
    • http://vakaruinzinerija.lt/userfiles/file/vijikuworuvetufupunosu.pdf
    • http://keemunblacktea.cn/uploads/file/130710478246.pdf
    • http://cyklo-sport-servis.cz/UserFiles/File/20703064172.pdf
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/b17438af9ece5b35995a9d86a55975eb/44633199457.pdf
    • http://kurier48.pl/files/userfiles/file/bawam.pdf
    • http://ducthanggroup.com/webroot/img/files/dulunenolilo.pdf
    • https://alkhairi.co.uk/wp-content/plugins/super-forms/uploads/php/files/0d3b334bed0f20a9112c05d5e53e3154/soxuge.pdf
    • https://inarsindbari.org/uploads/xezofew.pdf
    • https://siemreaptraveltours.com/userfiles/file/94521302716.pdf
    • https://www.actionconstructionjax.com/wp-content/plugins/super-forms/uploads/php/files/134fdff2317acf3654cd3f2a7d88d12f/bujojuniredon.pdf
    • http://xn--80aagkbrca3apkgkee0a1bi.xn--p1ai/ckfinder/userfiles/files/dokemamezapolaluxawugogar.pdf
    • http://jiendurancecoaching.com/ckfinder/userfiles/files/zusumikiwa.pdf
    • http://thietbikhachsanvinhhung1.com/upload/files/27391260363.pdf
    • https://viboot.com/ckfinder/userfiles/files/vezosuxemakeju.pdf
    • http://liubeauty.com/luutru/files/46734116886.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=how+to+turn+on+gps+on+android+tablet
    • 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_off0000d792.bin
a2512cf984476c887cea3f3df4aa19da8ecdbbc2e62249470851480fc8fc9ab1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD792 18596 bytes
font_01_sfnt_off0001074c.bin
7375dfc809d58233948296171dd481d795b9272c1bbfa23e3f6e8b340145e797
pdf-font-stream PDF embedded font (sfnt) at offset 0x1074C 10884 bytes
font_02_sfnt_off0001202e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1202E 16792 bytes