Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc2f7afb7d0cf056…

MALICIOUS

PDF

75.4 KB Created: 2021-09-07 03:03:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 19a69269ed58acfff915dfcd8dee35fa SHA-1: b5d26f5f93e7c9d061756c22fe7429b684d1b2f5 SHA-256: dc2f7afb7d0cf05678f0b758ee200441fdf6eb041a0909e5eb19cc283c9a3bdc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites and utilize UTM parameters, indicating a potential phishing or spam campaign. The ClamAV detection and ML classifier strongly suggest malicious intent, likely to redirect users to malicious content or phishing pages. No scripts were extracted, but the structure and URL patterns are indicative of a malicious link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://smidgel.ru/uplcv?utm_term=goodnight+beautiful+dorothy+koomson+pdf
    • http://xn--spreewaldpension-lbben-9lc.de/meineBilderAlbertGrundschule/file/86268629372.pdf
    • https://luxartparquet.com/wp-content/plugins/super-forms/uploads/php/files/3372a6649074727473e3dfaddd0a773a/wulopototigog.pdf
    • https://chefinhogourmet.com/wp-content/plugins/super-forms/uploads/php/files/a9cdb49a3d3b2729c28eb23387cf94bc/talurejuxosalumor.pdf
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b96ae57d47---jikuwagorajogigi.pdf
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/160ac64ad14494---70193896122.pdf
    • https://cedarcreeksauce.com/wp-content/plugins/super-forms/uploads/php/files/c1caf7916a98801bf3f62d817e569085/medosejedaxugu.pdf
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/jqci43ibtletmct2ht1c5mi2en/31479103937.pdf
    • https://www.3dreamchurch.com/wp-content/plugins/super-forms/uploads/php/files/e58f3c67a9a8515c84f465de7d8db05f/satuxero.pdf
    • http://ultraljud.nu/bild/files/1908194823.pdf
    • http://nelly-design.ru/upload/files/10619021833.pdf
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16073a724d3702---43816945191.pdf
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b0d77a73457---85010002149.pdf
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc1b80d542---netezadewub.pdf
    • https://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/2e7579e97d89c7d03ee98fa578138387/venusademo.pdf
    • http://mq-water.net/upload/duguxisabolaxewufozodij.pdf
    • http://recrute.fr/files/files/49479191576.pdf
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/160f3a00c893ee---wefaguzexuzudobexa.pdf
    • http://sad-azov.ru/wp-content/plugins/super-forms/uploads/php/files/911e50c2e80bc2386bd19d58d4ed1a14/95640258298.pdf
    • http://studiophotosfashion.it/userfiles/files/80407339003.pdf
    • https://museuminiaturesbesalu.com/files/pezewifolesokiguganemuja.pdf
    • https://www.scilights.com/wp-content/plugins/super-forms/uploads/php/files/f936fac1a98d83a6824d221b453fd689/bedawovagowurojamevad.pdf
    • http://schokozentrale.de/idata/firidiforixumunuxogufofos.pdf
    • http://nuyewrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/9e64c2138bba867444bd9045b52c737b/67562241354.pdf
    • https://novamakine.com/upload/ckfinder/files/78775091083.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c130.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xC130 16792 bytes
font_01_sfnt_off0000d942.bin
eb3c0931e9dc1d9b5a6f547a012abda6f92af9ced39bc5565e9e35bc5ebf47ca
pdf-font-stream PDF embedded font (sfnt) at offset 0xD942 16948 bytes
font_02_sfnt_off00010585.bin
f3d41c0563fd3c78a480687d083c591df8fd882edd1de87c033379e08f0cee0f
pdf-font-stream PDF embedded font (sfnt) at offset 0x10585 11432 bytes