Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd94af2da81397ed…

MALICIOUS

PDF

77.8 KB Created: 2021-09-26 17:23:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 4bd6b157cbc14315bdeb4c65b0c1ee33 SHA-1: 5bbe9acbad80fdac3f6c912b7a23d65085f268c9 SHA-256: cd94af2da81397ed060f8ac5182a965b1f46aaab12cd81cb9e524154c1eb8451
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. Numerous heuristics point to the PDF acting as a link farm, directing users to various external domains, many of which appear to be compromised WordPress sites or disposable hosting. The embedded URLs suggest a phishing or malware distribution campaign, likely initiated via spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9901

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://crewmak.ru/uplcv?utm_term=sync+3+carplay+update PDF link annotation
    • http://www.jobibon.com/admin/userfiles/file/2854932175.pdfIn PDF document text
    • https://peptidturkiye.com/ckfinder/userfiles/files/lijogatixigofoxoselez.pdfIn PDF document text
    • https://hohsingfiber.com/ufiles/files/13584000258.pdfIn PDF document text
    • https://drainscovers.com/wp-content/plugins/super-forms/uploads/php/files/2efb5c5a79cc93476e5fc796c34014c3/nirozizososep.pdfIn PDF document text
    • https://spandoekland.nl/userfiles/file/tejovumozorosinalefovuvad.pdfIn PDF document text
    • http://trans-serwis.com/userfiles/file/52524913404.pdfIn PDF document text
    • http://33podarka.ru/pictures/files/bafodibi.pdfIn PDF document text
    • http://lsmtrontractor.com/upfiles/file/20210911053425.pdfIn PDF document text
    • https://codecs.ro/images/file/74278227482.pdfIn PDF document text
    • https://triangle-electronics.com/assets/userfiles/file/4858026001.pdfIn PDF document text
    • http://debrecen.varosom.hu/userfiles/files/68386970939.pdfIn PDF document text
    • https://podereilmontaleo.it/writable/public/userfiles/file/56175565431.pdfIn PDF document text
    • http://www.afamaresme.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613b48e6cc869---18386624796.pdfIn PDF document text
    • http://vietcem.vn/public/default/ckeditor/files/sogilelajilaxijepo.pdfIn PDF document text
    • https://nvsrolko.org/ckfinder/userfiles/files/bajupadasexixez.pdfIn PDF document text
    • http://studiolorenzoni.eu/userfiles/files/gejitufunupufug.pdfIn PDF document text
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143ada0132e1---tavozujububavotarejinugin.pdfIn PDF document text
    • https://weboonline.com/ckfinder/userfiles/files/gozesigebogusekaziz.pdfIn PDF document text
    • https://salvatoredivilio.it/userfiles/file/kujigiwalisanorux.pdfIn PDF document text
    • http://stsaischoolamritsar.com/slbdavbatala/userfiles/file/24421843608.pdfIn PDF document text
    • http://www.southforconstruction.com/frontend/web/ckfinder/userfiles/files/jofumoxewabesuxez.pdfIn PDF document text
    • https://www.iieng.org/editor/ckfinder/userfiles/files/xagotirododomilujim.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16138ff49b1f1f---96984447223.pdfIn PDF document text
    • https://steklo-shik.ru/userfiles/file/xojuvafepeniginafofugan.pdfIn PDF document text
    • https://www.chinacimctrailer.com/wp-content/plugins/super-forms/uploads/php/files/30e7fd7f2a63c647b7a89960979821c1/tixodanidebe.pdfIn PDF document text
    • http://kadh.kr/bobod/upload/file/kozuse.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/a6863bea78e021c178350880001bd877/didajemapekevilo.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_off0000c699.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC699 10588 bytes
SHA-256: ff2e67634299539391f6dca4f024327fdc48b8008203f7b594e22699adee9a52
font_01_sfnt_off0000def5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEF5 19328 bytes
SHA-256: 95b7e388f1ba34c8a9fb597e1a4b7b7300cc42d78015aef9955870c5209cf434
font_02_sfnt_off00011156.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11156 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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