Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b07ab1cbae5c735…

MALICIOUS

PDF

81.2 KB Created: 2021-08-02 21:56:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1f4ae43c4b80de0d3463687d8806b8b9 SHA-1: bfd9484d0d344e78c31abac5fcc98939cce5ba05 SHA-256: 5b07ab1cbae5c735ffbe320f98330d205342332c0b272c36a0a7f8a22586cb4f
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites and disposable hosting, suggesting it's part of a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a common PDF-based lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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 https://cructi.ru/uplcv?utm_term=little+nightmares+android+gameplay
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/160eca673eab8d---mirix.pdf
    • https://bahamianbrewery.com/ckfinder/userfiles/files/womepubafopufu.pdf
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/6k2gat93tkfb745h1iellhfeht/87238858094.pdf
    • https://brandonsmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/uoastno8foiggf60k8m6if5677/7392760873.pdf
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/160b4cf96f4179---gezevadigaxasarujo.pdf
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/ec7409ee110acf14fa0ce8dc982d8169/fewaleponixigobetumu.pdf
    • https://argekaucuk.com/nbg/upload/files/57633230975.pdf
    • http://botanicgardenscafe.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160bd5145dcb89---lakedevakatujalixe.pdf
    • https://homini.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1608b867309375---lozerap.pdf
    • http://tamilannuaire.com/var/www/vhosts/vps296430.ovh.net/tamilannuaire.com/images/file/97498955418.pdf
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/d469aa1eca67155628b0020086d2ce82/66865257985.pdf
    • https://www.mnspineandsport.com/wp-content/plugins/super-forms/uploads/php/files/a722b22aaba8689868e48c76405f5888/91022052260.pdf
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160dbc7b8bd649---zipilekifatetitulolened.pdf
    • http://anhuifan.com/upload_fck/file/2021-5-18/20210518194504972086.pdf
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/1607866137e7fd---85478202203.pdf
    • http://messtores.ca/fck_user_files/file/66690590250.pdf
    • http://tokyoto.pl/UserFiles/file/zivunile.pdf
    • https://windsbs.biz/files/file/92473696980.pdf
    • https://choiceenergynetwork.com/wp-content/plugins/super-forms/uploads/php/files/784ec36116611517f93bf4bb95050784/mefog.pdf
    • http://casier-a-bouteilles.com/file/fanamubuzonolosumepaf.pdf
    • http://ajisushionline.com/uploads/files/84144643732.pdf
    • https://www.federatedlighting.com/wp-content/plugins/super-forms/uploads/php/files/3125ad3af6a6ad3e05c78e68045004fe/37369699892.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_off0000d6f3.bin
4561b4bbcf127afe5f2c179791f71c77d1ea311c0cbcb8cdf25a32ab2b816074
pdf-font-stream PDF embedded font (sfnt) at offset 0xD6F3 10912 bytes
font_01_sfnt_off0000efbf.bin
5d92d2a25b22b6c7d8290684c761526a4a9474cbaf185b6876f6c239e9d69867
pdf-font-stream PDF embedded font (sfnt) at offset 0xEFBF 16920 bytes
font_02_sfnt_off00011c0f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11C0F 16792 bytes