Malicious PDF — malware analysis report

Static analysis result for SHA-256 561cb3d85cd2c3e0…

MALICIOUS

PDF

90.2 KB Created: 2021-07-18 20:07:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ba1b9f23742b84cd11735b0c5a98b0ef SHA-1: da1e5a5deff32f75ead0a53c7853a37ad69a5338 SHA-256: 561cb3d85cd2c3e06fb400eac8e653776aeb0658551313cdd858904613e426b0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF was flagged by ClamAV as a phishing trojan and by an ML classifier. It contains numerous links to compromised WordPress sites, specifically targeting the formcraft plugin's file upload functionality. These links likely serve as a distribution point for further malicious content, such as phishing pages or malware payloads. The presence of these links suggests an attempt to leverage external resources for malicious purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9939

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/1609cbd5091b0b---5323286411.pdf
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c030d388662---23670389290.pdf
    • https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/e98n2038u3u4263oqu4kdfujgn/pemipit.pdf
    • http://quickvideo.nl/userfiles/file/68157299360.pdf
    • https://burmesecatclub.nz/wp-content/plugins/super-forms/uploads/php/files/6e63db0ae98e519c4d12877b6c90a9d6/57779588471.pdf
    • https://hondamienbac.vn/userfiles/file/64003919138.pdf
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/143fe588cb0b0652e7409c90855131ed/xawuloviwadukas.pdf
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/160ac4edaef9d3---85760892836.pdf
    • https://mednet.mk/public_html/upload/userfiles/file/61709553462.pdf
    • https://www.picmephotoboothhire.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607b67949487f---30277212488.pdf
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160e04efc2e470---tuwomogazakir.pdf
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160df34d8eb12a---tulenapowetosaxasexegerox.pdf
    • http://mebco.ru/images/file/diwubumipepabo.pdf
    • http://kino-cosmic.ru/sadm_files/80387222600.pdf
    • http://agnieszkapawlik.com/userfiles/file/bigakalaga.pdf
    • https://www.brightfieldbusinesshub.co.uk/wp-content/plugins/super-forms/uploads/php/files/icj416kgbs2n0bts10a023pn1a/31422772840.pdf
    • https://fid-data.fr/app/webroot/uploaderfiles/wojevikavo.pdf
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c17e5861094---gasix.pdf
    • https://imaggu.com/ci/userfiles/files/zirinefakewig.pdf
    • https://www.cr-sdc.org/wp-content/plugins/super-forms/uploads/php/files/3b29e630dd0df2b24e678d765cd0cc8f/8979571108.pdf
    • https://maxim-catering.de/wp-content/plugins/super-forms/uploads/php/files/ep1dnjn3nsoksvgviju3ajjko9/laraxagewe.pdf
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609d0cb89ad17---luvewewulufesunite.pdf
    • http://iwish-cosmetics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0af8e37592---zitusilopo.pdf
    • http://alliance-ic.ru/uploads/file/dogexakidixamuzebiwet.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=my+laptop+does+not+connect+to+wifi
    • 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_off0000fbe8.bin
6a1213f2b369b469bb769bb91bd6b2ce7dd32d492759af3ebe473f553621ac3e
pdf-font-stream PDF embedded font (sfnt) at offset 0xFBE8 17704 bytes
font_01_sfnt_off00012a82.bin
c9061e38ca1d6b111ef42326cdfd06cba98138edc003a88273a66e0fd5ce2a31
pdf-font-stream PDF embedded font (sfnt) at offset 0x12A82 10704 bytes
font_02_sfnt_off0001434b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1434B 16792 bytes