Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e3cbb979b1b0fb1…

MALICIOUS

PDF

82.9 KB Created: 2021-09-02 07:53:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8bd35ed6fe15faa240c870dde5f05951 SHA-1: 7a13255df0eeb830ad2a2043ddac33b72b7eb6d0 SHA-256: 3e3cbb979b1b0fb193bc8fdbfedaeb73b835fe6fcd732b72a81ec63f1ce4c38b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous links to external websites, many hosted on disposable domains or compromised CMS uploads, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the overall structure strongly suggest an attempt to exploit users through deceptive links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://ketchas.ru/uplcv?utm_term=table+relationship+diagram+online
    • http://fautographie.org/images/userfiles/files/6420043422.pdf
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a38f3c9d1c1---roworozasigomiruzubowago.pdf
    • https://celebicatering.com/upload/ckfinder/files/1396512287.pdf
    • https://eatorhours.org/e-bussiness/fckimages/file/4012853059.pdf
    • http://djarkitek.com/temp/vinney/HTML/userfiles/file/36394548593.pdf
    • http://charivne.info/images/file/nakezerujumakedope.pdf
    • http://tramtronbetong.com/uploads/userfiles/file/17902219700.pdf
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160dc56ca547c1---fanenemeled.pdf
    • https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/gf5afiai5u7ia0h65575jpjfnt/72749566375.pdf
    • https://suadienlanhhanoi.net/upload/files/54523091135.pdf
    • http://www.impactit.in/ckfinder/userfiles/files/3559274247.pdf
    • http://hiroi-es.info/yamituki-n/uploads/files/nijizi.pdf
    • http://accessiblevehicleservices.com/userfiles/file/15647467341.pdf
    • http://lakehighlandsrw.org/clients/863582/File/75922486034.pdf
    • http://www.kevimotor-rock.hu/files/files/dulojase.pdf
    • http://esipro.lu/userfiles/file/47946332497.pdf
    • http://esipro.fr/userfiles/file/lewefakesasutibafa.pdf
    • https://postelezmasivu-ostrava.cz/ckfinder/userfiles/files/66203525398.pdf
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/rrpmeoj3sm7rs0a9f67sludha5/78992672185.pdf
    • http://greenbrier101.com/userimages/57478134781.pdf
    • http://pascalparrot.com/uploads/assets/file/galolijisamuxol.pdf
    • https://dd-inside.de/userfile/file/dekumudime.pdf
    • http://duocthientam.com/uploads/ckfinder/files/76165923112.pdf
    • http://tainanrup.longi.tw/uploadfiles/files/20210824_084535_4524.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_off0000e213.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE213 16792 bytes
font_01_sfnt_off0000fa25.bin
a9e9f03073cd32bd2cd66b5ff8c88fe6a168e617b0cd2c833b7f980bb62a7ddc
pdf-font-stream PDF embedded font (sfnt) at offset 0xFA25 16708 bytes
font_02_sfnt_off00012502.bin
414661a18810f0dfdbc7dfef012a905ca8e810a06261410034ca0a8db1c8a8e2
pdf-font-stream PDF embedded font (sfnt) at offset 0x12502 10944 bytes