Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4f6979288850f99…

MALICIOUS

PDF

75.4 KB Created: 2021-07-28 07:09:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 1cff0e85b1b28aaa9c69f0419d8e7d80 SHA-1: afd932ad58c14d58d14c36f9882bf0e255c1e360 SHA-256: b4f6979288850f9944f3ccce82bfb6afd932a38295c1a5929fbe16e30110594c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous URLs pointing to compromised WordPress sites, suggesting a link farm designed to redirect users. While no scripts were directly extracted, the presence of embedded URLs and the nature of the heuristics indicate a phishing or malicious redirection attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://saraelv.no/wp-content/plugins/formcraft/file-upload/server/content/files/1609b92edb379a---91864276486.pdf In PDF document text
    • http://medicapoland.pl/uploaded/file/68633415880.pdfIn PDF document text
    • https://alice-immo.com/userfiles/file/28451642890.pdfIn PDF document text
    • https://whiteelephant.co.in/wp-content/plugins/super-forms/uploads/php/files/2935d14673cb6c6b6220e3012cb00b0a/23455279938.pdfIn PDF document text
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608611bab9b05---31208445140.pdfIn PDF document text
    • http://mobitransjogja.com/files/25157510356.pdfIn PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bd5877007b6---23555149550.pdfIn PDF document text
    • http://afgventuregroup.com/cfiles/file/xugowosemo.pdfIn PDF document text
    • https://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/1607e90e283416---75215880879.pdfIn PDF document text
    • https://aiwatopup.com/ckfinder/userfiles/files/53954465354.pdfIn PDF document text
    • http://sloplast.com/userfiles/files/pumanenaminupokowelotume.pdfIn PDF document text
    • http://enidbtwcreunion.com/clients/5/52/52e94d62e82ff66504c7d921fc07bf70/File/pavixevixi.pdfIn PDF document text
    • http://security-m.jp/tool/images/file/3496088019.pdfIn PDF document text
    • http://kisito.com/userfiles/file/fexilebag.pdfIn PDF document text
    • http://multiseal.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/1609f0d9046cb7---kurabiwe.pdfIn PDF document text
    • http://ji-tien.com/userfiles/file/61644416432.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160862a1a78c1b---lozevututisutanofebimutal.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/160851ed6c1bb0---lojefil.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070b2544afe5---82678375106.pdfIn PDF document text
    • http://tlxzkj.com/uploads/file/080629472940.pdfIn PDF document text
    • http://terapeutickemasaze.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160881b8232882---faraviropivozezezo.pdfIn PDF document text
    • http://nextgenship.net/upload/file/20210522162172278552.pdfIn PDF document text
    • https://cvconstructionsgoa.com/pharma/admin/userfiles/file/kubadisimiragovefakosasuz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=embedded+question+exercises+pdf+with+answersPDF 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_off0000bfd1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFD1 11396 bytes
SHA-256: dda99188f15153c4037fbc0a7a91bf8d4feeaf3408255697070b5c65aaaa9f8d
font_01_sfnt_off0000da26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA26 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f238.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF238 17024 bytes
SHA-256: 39594a4c01dea8f59d88b0c183a34156ae00965a2698d39adbfa0de81e996f8d

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