Malicious PDF — malware analysis report

Static analysis result for SHA-256 922a3e176249eb9e…

MALICIOUS

PDF

84.5 KB Created: 2021-09-02 00:24:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 47cdb15d0924a59e47ab49cee9427b97 SHA-1: f6842fa6c50a3deab1be2a488250163c67beab9b SHA-256: 922a3e176249eb9ea652181fe1d0410cbc302a58af9b34687db3f08835c3bb66
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to compromised websites or disposable domains, indicating a link farm designed to redirect users. Heuristics suggest this is a phishing or malware distribution attempt, with ClamAV specifically identifying it as a 'Pdf.Phishing.Trojan'. The presence of multiple external URIs and link farms strongly suggests an attempt to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9924

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://krisoc.ru/uplcv?utm_term=how+to+create+separate+branch+in+git PDF link annotation
    • http://polyacer-ecp.com/userfiles/files/20210719_043051.pdfIn PDF document text
    • http://ligneus.hu/upload/file/9928744967.pdfIn PDF document text
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160a1f8bb8db90---jijeguxifitimi.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160866990ce302---wenufitakusesuworoj.pdfIn PDF document text
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/4bcf5e4e829f2ff3e0d932c451b5391e/93238028712.pdfIn PDF document text
    • http://dworbieland.pl/userfiles/file/rulipugupenotedufodela.pdfIn PDF document text
    • https://dptech.vn/uploads/files/samuzefefaji.pdfIn PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160762a6ea8ef9---rikovepasidejusagad.pdfIn PDF document text
    • http://sciencevier.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c676849ad0---72385406460.pdfIn PDF document text
    • https://la-klamm.org/Files/files/bagifezisixeki.pdfIn PDF document text
    • http://girisimcilikproje.com/resimler/files/91404024205.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/o25h8cfu83b77snbetljrt9038/23818794591.pdfIn PDF document text
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/j3fqloojuef3f0echm814ddeql/52445827960.pdfIn PDF document text
    • https://weboonline.com/ckfinder/userfiles/files/89444582228.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160859c9f3d57b---gamasilixutivanopovo.pdfIn PDF document text
    • http://studioarchperissinotto.eu/userfiles/files/42174643336.pdfIn PDF document text
    • http://camberwelltaxi.com/survey/userfiles/files/13773510933.pdfIn PDF document text
    • http://cappellastudio.it/userfiles/files/32679392441.pdfIn PDF document text
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160a1c690b7ca2---ruworudugutib.pdfIn PDF document text
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160e39ba87180b---zazamoxumuduxotejemej.pdfIn PDF document text
    • https://regeneracion-capilar.com/wp-content/plugins/super-forms/uploads/php/files/6e13c1707730bd11e5ba0aed2dcd07ea/meranodipusuxuxobixe.pdfIn PDF document text
    • http://www.alfapilates.pl/upload/file/setalegusubosikazukix.pdfIn PDF document text
    • https://mytopics.it/uploads/file/tuvisafitazekomobamoro.pdfIn PDF document text
    • http://nsureunion.com/clients/71556/File/valebos.pdfIn PDF document text
    • https://vigiweb.cl/dinamicos/files/file/10997949887.pdfIn PDF document text
    • http://raczcsalad.hu/files/benena.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_off0000e1d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1D5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f9ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9EC 10824 bytes
SHA-256: eb9c8bba8c71a4ebcdc0ea99319c8ba5c0b9761f5c2a0353161b8623bbda1e91
font_02_sfnt_off0001129f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1129F 18584 bytes
SHA-256: dde4d88a06b951073b1e8e1cee9b4bcba8df5a34512f134304066d9daa2eead2

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