Malicious PDF — malware analysis report

Static analysis result for SHA-256 03c2f5c82bc18f36…

MALICIOUS

PDF

85.6 KB Created: 2021-08-09 11:37:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 036d9fff41eb03f4d0939c7fadc095f4 SHA-1: 30a92c62e8f9d2c623a9dee52acc89ebb2458a35 SHA-256: 03c2f5c82bc18f3606d82f5ea51d4d64fc03d0440c4da874e253b4823fc78010
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links to external websites, many of which are hosted on compromised or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The document body is heavily obfuscated and unreadable, providing no direct content clues.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

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://yangs-ns.com/ckfinder/userfiles/files/20210724000515.pdf In PDF document text
    • https://faprosid.com/file/9363290301.pdfIn PDF document text
    • http://gzky.cn/dubeite/ckfinder/userfiles/files/20210613_190226.pdfIn PDF document text
    • http://fese.in/ienupdimages/images/files/mixupu.pdfIn PDF document text
    • http://bmcnx.com/userfiles/file/vukapa.pdfIn PDF document text
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/16100fe31e62fe---44456900342.pdfIn PDF document text
    • http://thuexe7cho.vn/upload/files/24060537426.pdfIn PDF document text
    • http://stacjaregeneracja.pl/userfiles/file/sagixixukulemulub.pdfIn PDF document text
    • http://www.medicellbank.com/userfiles/files/53236322017.pdfIn PDF document text
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/261ba248f61c3f3acbcfdcb7b7eec52c/sumerokafobamisifepete.pdfIn PDF document text
    • http://positiveforce.in/uploads/files/puxom.pdfIn PDF document text
    • https://akapacha.com/userfiles/file/78756705903.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc4fa61c5f5---pobuletofalonukopob.pdfIn PDF document text
    • https://www.temsilcisitesi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e94b3167a2b---46333502710.pdfIn PDF document text
    • https://doitsolutions.co/wp-content/plugins/super-forms/uploads/php/files/951ae3f3899f4c0de7ce5916cb5adc37/59158948741.pdfIn PDF document text
    • http://amdind.com/userfiles/file/25452738954.pdfIn PDF document text
    • http://wijnhuis-vaessen.nl/site/data/ws/files/vebujufa.pdfIn PDF document text
    • https://tennis94.fr/img/pics/files/basimamebugevisiv.pdfIn PDF document text
    • http://nacyc.jp/Upload/file/xakej.pdfIn PDF document text
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/cc7b0bcc46513a59a49f0915715a1b90/65529051100.pdfIn PDF document text
    • http://madang.eu/f_pds/fck/file/kivajogivesajajazoluwubuj.pdfIn PDF document text
    • http://baloneacessorios.com/_upload/file///95508677704.pdfIn PDF document text
    • http://famillespourstarlight.ca/clients/a/a9/a9b42c05011d3bb27e7f7ec2ed30324f/File/83507727677.pdfIn PDF document text
    • https://www.pirkitpadangas.lt/ckfinder/userfiles/files/sonuvanogisolegejirane.pdfIn PDF document text
    • http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a6195c2f960---43185458888.pdfIn PDF document text
    • http://ahxxzx.com/userfiles/202105/file/58435398527.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=questions+for+hr+fresher+interviewPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ee1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE1F 10412 bytes
SHA-256: 7958d953e9654fb36382819e192fb1272004887b98b6a73d98711dd0e29f8d10
font_01_sfnt_off000105d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105D4 16480 bytes
SHA-256: a155dddcfd1d738e569dc974bb84b3f8a065149955c48cf74e8baed7b11f95ef
font_02_sfnt_off00012fd6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FD6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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