Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4bad7bc29328179…

MALICIOUS

PDF

80.2 KB Created: 2021-09-20 07:36:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 31aefc99fd2446763be28560327c6e1a SHA-1: fdfd865cfce67f084019942e0f3e6207dd3fad5b SHA-256: b4bad7bc29328179cff5c3b2a6d5d6c8794390775e0d8374a33af358c990e43c
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous URLs, many of which point to compromised websites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of 'utm_term' in one of the URLs further indicates a phishing or spamming campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 https://huntic.ru/uplcv?utm_term=stewart+8th+edition+calculus+pdf PDF link annotation
    • http://acril.ru/ufiles/files/55476407390.pdfIn PDF document text
    • https://aslimitada.com/userfiles/file/88093305679.pdfIn PDF document text
    • http://fairbank-ia.org/admin/ckfinder/userfiles/files/32287920724.pdfIn PDF document text
    • http://architettipassarinmarzotto.com/userfiles/files/35126308840.pdfIn PDF document text
    • http://caycanh.vn/images/fck/file/26154577018.pdfIn PDF document text
    • https://namkhoasaigon.vn/web/images/files/94595226908.pdfIn PDF document text
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132b40a71334---1236973138.pdfIn PDF document text
    • http://rezidencianestor.sk/app/webroot/files/ckeditor/files/bidurugowunebumidimimu.pdfIn PDF document text
    • http://bivalyracing.hu/files/file/10875231409.pdfIn PDF document text
    • http://constantcontinuity.com/membership/data/files/91686870891.pdfIn PDF document text
    • http://psychologkmalinowska.pl/ckfinder/userfiles/files/refozapalowajed.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142d80ddee85---paxudanim.pdfIn PDF document text
    • http://ipllaser.in/uploads/junofifuwufaxoverop.pdfIn PDF document text
    • https://sdudyogtechnologies.in/ckfinder/userfiles/files/12303218595.pdfIn PDF document text
    • http://sjzhtchem.com/upload/files/44931155325.pdfIn PDF document text
    • http://maivietnamesecotati.com/uploads/files/463930862.pdfIn PDF document text
    • http://easternhoteljeju.com/FileData/ckfinder/files/20210915_278599406656C97C.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/fab86429862f0eac10d403219d4ec6d1/76035425280.pdfIn PDF document text
    • https://journeypeople.cc/wp-content/plugins/super-forms/uploads/php/files/dd00ac4f5e25434fa7ec6df07465e59d/xanejowe.pdfIn PDF document text
    • https://www.domaine-vrignaud.com/ckfinder/userfiles/files/64166232598.pdfIn PDF document text
    • http://exdebt.bg/userfiles/file/34619866097.pdfIn PDF document text
    • http://master-stroi76.ru/userfiles/file/2155944436.pdfIn PDF document text
    • http://red-persimmons.com/upfiles/editor/files/nenojevomexiwut.pdfIn PDF document text
    • http://studiogaleazzo.eu/userfiles/files/82620182063.pdfIn PDF document text
    • 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_off0000d201.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD201 11188 bytes
SHA-256: 9f3a84c9b49cf1d836d76bf274127f5988cbfafa063e46ca8edc9e7a4dc80f45
font_01_sfnt_off0000ec28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC28 18188 bytes
SHA-256: 6251a1b22c677ef822d1215849a898ecdb22e69a688c4e93975e6fc4759d7d48
font_02_sfnt_off00011ad6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AD6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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