Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1c62e5acab15c3e…

MALICIOUS

PDF

84.0 KB Created: 2021-09-03 04:24:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 04d437dcbd81323449948b688ae79eef SHA-1: 999ae609b3fe9a91ffc6d1dccb2011cc9926e8b3 SHA-256: a1c62e5acab15c3eb3acbc97a9b97268d76d3d73dbe62d35c2e0810b51c23e48
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, indicating it likely exploits a vulnerability or serves as a phishing lure. Heuristics identified it as a link farm, with many embedded URLs pointing to other PDFs hosted on compromised or disposable domains. This suggests a multi-stage attack where the initial PDF serves to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://chromoink.com/updates/file/rubojibuzomodemi.pdf In PDF document text
    • https://dehayemek.net/upload/ckfinder/files/vipofopojobofopikila.pdfIn PDF document text
    • https://pvesc.vn/uploaded/file/95664440798.pdfIn PDF document text
    • https://mccartha-cobb.com/userfiles/files/26693072588.pdfIn PDF document text
    • http://www.cheapmotorcycleinsurancepa.com/wp-content/plugins/super-forms/uploads/php/files/fba6c532528dfcc22c5181a121191021/berepoperu.pdfIn PDF document text
    • http://cuacuondaiphuc.com/upload/files/nexifakavipuk.pdfIn PDF document text
    • https://eamenfaraz.com/cache/fck_files/file/91935403883.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608298e861bd2---lanux.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/a5778483cc58782fa991a3ce1ea37d19/36575675495.pdfIn PDF document text
    • http://grupopiscis.com/upload/files/zavuwonugujuturuz.pdfIn PDF document text
    • http://mebco.ru/images/file/73904648896.pdfIn PDF document text
    • http://xn--or3bi2da319p.com/upload/fckeditor/file/rigepimamimirites.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b090616550---47694184499.pdfIn PDF document text
    • http://artikos.pl/userfiles/file/79236727873.pdfIn PDF document text
    • https://www.democratum.com/wp-content/plugins/super-forms/uploads/php/files/e2eac9b9ddbffc345ae3d7177875dab7/26691076746.pdfIn PDF document text
    • https://seroinstitute.com/wp-content/plugins/super-forms/uploads/php/files/d30c25865bce1cb7c7fe579d9bc228c1/pamemupowafarase.pdfIn PDF document text
    • http://amdind.com/userfiles/file/91360884558.pdfIn PDF document text
    • http://tznjl.com/userfiles/files/66776274154.pdfIn PDF document text
    • https://immo-cjeanpaul.lu/userfiles/files/28149968966.pdfIn PDF document text
    • http://dichvuhieuchuan.com/upload/files/lenuxe.pdfIn PDF document text
    • https://eletmodguru.hu/files/files/80137999793.pdfIn PDF document text
    • https://www.qlsny.com/wp-content/plugins/super-forms/uploads/php/files/1450260db6652117d04472f5c527ed83/dumisirofuz.pdfIn PDF document text
    • http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/keiump7j3kdej0mkt11vqheae5/woraxebijukukexenupiveva.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=rotate+pdf+wordPDF 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_off0000e233.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE233 10212 bytes
SHA-256: cc047bdfd5787fe20cc1941c450502ae33694b22fbb178883ed655e2288a8834
font_01_sfnt_off0000f946.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF946 18708 bytes
SHA-256: 5b20c35303e630cca5f491132d9e93a511ca14ed96263311d9684dd2adf05573
font_02_sfnt_off00012a4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A4A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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