Malicious PDF — malware analysis report

Static analysis result for SHA-256 78f61e39f1333add…

MALICIOUS

PDF

88.0 KB Created: 2021-07-03 15:15:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 5e7d0a5b726cd43591ea2fad6266cc4e SHA-1: c9185f3618c914999fda6932e244b66064c15749 SHA-256: 78f61e39f1333add4d69c0ecf1e69805dfa279480551f754cb6b0ec5c85e67df
156 Risk Score

Malware Insights

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

The file is a PDF containing numerous embedded URLs, many of which point to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically identified as phishing or a trojan. The presence of 'utm_term' parameters in some URLs suggests a phishing or SEO-based lure to drive traffic to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://chcial.ru/uplcv?utm_term=septicaemia+in+babies PDF link annotation
    • https://krimgranit.ru/wp-content/plugins/super-forms/uploads/php/files/f85fc40a3ee691d6f935f36ff5945029/38170397705.pdfIn PDF document text
    • https://www.justgym.co.za/wp-content/plugins/super-forms/uploads/php/files/fvo14a55udfvasd416s4iqalbq/ximufikaxigakopiko.pdfIn PDF document text
    • http://oresteruggiero.com/userfiles/files/sabipebuxevunolubi.pdfIn PDF document text
    • http://lyshiying.com/d/files/23652391505.pdfIn PDF document text
    • http://fenotropil.ru/userfiles/file/95590539025.pdfIn PDF document text
    • http://alpha-th.com/userfiles/file/60467593795.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073a2cdc93b7---88089299538.pdfIn PDF document text
    • http://traditionsradio.com/wp-content/plugins/super-forms/uploads/php/files/224s97pv9pn0d58l4rm83ahka6/96275260800.pdfIn PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/160baebb2769d0---waroxedoxevipitagema.pdfIn PDF document text
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b12632abbd3---10400591456.pdfIn PDF document text
    • https://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/vd3qe9ru3cjdh3nrt1j4sk7b89/denikukum.pdfIn PDF document text
    • https://palcev.ru/userfiles/file/48735982116.pdfIn PDF document text
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/8251527a66054b7a2431a5c84ab73942/zituzanazujenod.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a8c4f06df6d---tadekiwa.pdfIn PDF document text
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/160875858d618a---godadimalad.pdfIn PDF document text
    • https://hgb.se/filer/file/45262546357.pdfIn PDF document text
    • http://www.kickcommerce.com/userfiles/file/69196360418.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/eeaa7b5eec7863570f3788875b16cc99/33738862568.pdfIn PDF document text
    • https://sasalidayanisma.org/uploads/file/38325249487.pdfIn PDF document text
    • https://alshaabcoop.com/userfiles/file/lewimivopetonuwud.pdfIn PDF document text
    • https://ipcare.nl/wp-content/plugins/super-forms/uploads/php/files/sgkho1oi8t8qjco9c9hqmedlrj/gevivarexisisorobi.pdfIn PDF document text
    • http://exito-opakowania.pl/userfiles/file/62499283533.pdfIn PDF document text
    • https://dm288.rs/slicice/file/64544436098.pdfIn PDF document text
    • https://jerseyshorepirates.com/userfiles/files/69027196408.pdfIn PDF document text
    • https://www.alongsideasia.com/wp-content/plugins/super-forms/uploads/php/files/8e49ddb3f311cd85795e14e4e48befa3/sinasokawub.pdfIn PDF document text
    • http://perfecturology.cafe24.com/upload/editor/imagefile/torezopojadaliraxugom.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_off0000f834.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF834 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001104b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1104B 10484 bytes
SHA-256: 4e02bf6dad3370d38a2a79a33a4034930d48841866bb09f1f07fde3514242f27
font_02_sfnt_off000127e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127E2 16436 bytes
SHA-256: b2fd3522da2c22621f06b82e99632fcda9142d94403545a95c0f0db63c3b6462

Open this report in the interactive analyzer, or submit your own file for analysis.