Malicious PDF — malware analysis report

Static analysis result for SHA-256 7efd2ce88fddef75…

MALICIOUS

PDF

88.3 KB Created: 2021-08-02 06:01:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: ca2d99f21b152844be4b61c897dfcf2f SHA-1: 99362699a2ee8ede7ec0117322d5abeb71d15457 SHA-256: 7efd2ce88fddef751cdaad366f5cb36c0fce4ccdcb6d1f88ea8fbcf6401dd195
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to compromised websites or domains used for SEO manipulation. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or distributing further malware through these links. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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 http://anhuizpyy.com/upload_fck/file/2021-5-19/20210519145048817974.pdf In PDF document text
    • http://optimus.org.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c59de7a457f---48868801287.pdfIn PDF document text
    • http://xpressup.com/userfiles/file/sivinafo.pdfIn PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2e62ca1521---14440930038.pdfIn PDF document text
    • http://12shio5.com/contents//files/1383526290.pdfIn PDF document text
    • http://canigrup.com/userfiles/file/bakokejisiwujezipiloraz.pdfIn PDF document text
    • http://novehorizonty.sk/userfiles/file/21564254898.pdfIn PDF document text
    • http://presssimayeshahr.ir/pic/file/fokigulinogarazewudepos.pdfIn PDF document text
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f1554fe8559---nopubolabekakigimi.pdfIn PDF document text
    • https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606e38711d0c0---88543593590.pdfIn PDF document text
    • https://ibeguiristain.com/userfiles/files/32768007394.pdfIn PDF document text
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/ec551ec732e5e58b8bec8fb2c4324c5e/zifikudoxi.pdfIn PDF document text
    • https://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072304bd9ad5---nifupolokuvidaniwadinaxix.pdfIn PDF document text
    • https://maclashoes.it/file/zerakaluwekerijuv.pdfIn PDF document text
    • https://nikosdimos.gr/userfiles/file/67653914955.pdfIn PDF document text
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/6815007afa16444427dff3dcde0000f5/lisaruzoro.pdfIn PDF document text
    • https://apoiotelecom.com/imagens/img_fckeditor/file/4162768345.pdfIn PDF document text
    • http://womenwhorockarkansas.com/clients/4/4c/4cfcdabbb7b8ad81bafe9a4295858145/File/fovoxidixirowebupebefo.pdfIn PDF document text
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092e5dad4cc1---bafevivulomirenarez.pdfIn PDF document text
    • http://easyliveconstruction.com/ci/userfiles/files/jefuxogaribitu.pdfIn PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/160d2f0060866d---bojejakoju.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=maytag+bravos+xl+washer+repair+manualPDF 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_off0000f2df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2DF 11300 bytes
SHA-256: 5b29b3871b7324a9055f3569a737b395a4e8bb3d7f4b3afff71431969391be68
font_01_sfnt_off00010d21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D21 17524 bytes
SHA-256: 03f81b8cbb54ca076185be51a779eb4ab3a7077912b9153bd4b88c38da2c9e54
font_02_sfnt_off00013b20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B20 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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