Malicious PDF — malware analysis report

Static analysis result for SHA-256 68dbf00436e3d632…

MALICIOUS

PDF

85.4 KB Created: 2021-07-04 19:44:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: af4cfa87dfc0cb8b06adbaa1d9238e87 SHA-1: 3598a12eb34e80be5ee9f57b44c5d2b713bbe8a8 SHA-256: 68dbf00436e3d632746d88684f03c473617bff5bcd0ae4fbec2b4b3483388d1a
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised CMS upload directories, suggesting it's designed as a link farm for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were extracted, the structure and URL patterns are consistent with a malicious document designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://minlinart.com/archive/upload/files/voxamezidil.pdf
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/6950164145f69fd3f4c1a9b2ac96f5f9/88723879651.pdf
    • https://specialbrands.gr/wp-content/plugins/super-forms/uploads/php/files/159dd66ea0a5856ab833491b0ef35097/noluxetedob.pdf
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/vjolr63qe9faqhnbr1hski4ldu/xebeguxesusupawaka.pdf
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/d016d20f18ef37cc1c56d24dac42f958/15199195088.pdf
    • https://ural-aiti.ru/admin/ckfinder/userfiles/files/96903266397.pdf
    • http://fotofolliasanlazzaro.it/userfiles/files/zalejukuxapugopuxupikuv.pdf
    • http://www.verneteco.com/ckfinder/userfiles/files/xelewirimevadem.pdf
    • https://jollytime.ru/wp-content/plugins/super-forms/uploads/php/files/a7db1ffa411d2d7702ff105bf532e2d1/25963673829.pdf
    • https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/afabe6d3d425fec6598e74df44deddb8/92750332529.pdf
    • http://dhf-china.com/d/files/rurususibixade.pdf
    • https://ecomassage.pt/wp-content/plugins/super-forms/uploads/php/files/6s5g4grv5dke8vthb0qeaj9fpr/92077428557.pdf
    • https://hmjrgoldhockey.org/wp-content/plugins/super-forms/uploads/php/files/bcb06e0d346f343065b7e0fbf235558e/65860841426.pdf
    • https://www.sanier.pl/wp-content/plugins/super-forms/uploads/php/files/gddgoss9cggi66m7bas6k0897a/29588289682.pdf
    • http://anandamsanyal.com/userfiles/file/gidapudeweferugezo.pdf
    • https://personnelcle.com/userfiles/file/13111236779.pdf
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608646816551d---tawumi.pdf
    • http://kondicionery-dolgoprudny.ru/upload_picture/file/sadibujimoxefukog.pdf
    • http://karthikeyanjayaram.com/userfiles/file/tupafimusekipo.pdf
    • http://www.radio-kum.si/data/files/96556830841.pdf
    • https://graffitipaintstudio.com/wp-content/plugins/super-forms/uploads/php/files/73d7760f097320d8fbd99a1f9ba7af23/wigarulepuze.pdf
    • https://engravestone.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b6ec6762be---22709846516.pdf
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6c748050cb---girivalofo.pdf
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/1608e40b6d2a61---refezedud.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=campbell+picture+framing
    • 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_off0000ea34.bin
e0c7b0074b9d68cac32f53a5beb127d4881863c28867d4724b1a5a1e86ce7e41
pdf-font-stream PDF embedded font (sfnt) at offset 0xEA34 17396 bytes
font_01_sfnt_off000117b1.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x117B1 16792 bytes
font_02_sfnt_off00012fc8.bin
1e6ed309f73cb8c091b7f8fe0c060c1e7681c9dd025189b106c7319e0ff2f9f7
pdf-font-stream PDF embedded font (sfnt) at offset 0x12FC8 10804 bytes