Malicious PDF — malware analysis report

Static analysis result for SHA-256 1ca83169f69561b5…

MALICIOUS

PDF

104.6 KB Created: 2021-06-28 07:23:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 820ae381499904dad867025c48a0ca3d SHA-1: c311a7338fa8d30e9e519709b474237d6e75611e SHA-256: 1ca83169f69561b5a33b7a1a40823abf3009fc16953f2581113d3c7caf6d02f9
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 a link farm designed to redirect users to malicious content. ClamAV detection and ML classification further support its malicious nature. The file's structure and URL patterns are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9790

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://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16074d305a9494---larilujuziku.pdf
    • http://1hozain.ru/files/userfiles/files/25513058785.pdf
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/75e270711d9ca571473c060126e17bd5/21020788554.pdf
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ca357aec461---3679828796.pdf
    • https://www.kbstephens.com/wp-content/plugins/super-forms/uploads/php/files/6a672c972a742f3072d2890c362b45a4/51496616739.pdf
    • http://diamantina-joaillerie.com/ckfinder/userfiles/files/nowixisugaxuza.pdf
    • https://suativisamsungtaihanoi.net/upload/files/sezonudas.pdf
    • https://plswa.com/wp-content/plugins/super-forms/uploads/php/files/405a85b0cb1c051db48ac265ccf38ba4/72056269145.pdf
    • https://cgeminfos.ma/upload/file/23137045119.pdf
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160845fdc70085---79271395111.pdf
    • https://www.alignerco.ca/wp-content/plugins/super-forms/uploads/php/files/9df53356fe626b0cbbad48210fad55b3/17395534016.pdf
    • https://jclifeschools.org/wp-content/plugins/super-forms/uploads/php/files/585de9545b75b3fb07da1646c23607c8/jupemewajisufavilowufu.pdf
    • https://arvikabc.com/images/uploadedimages/file/64984999543.pdf
    • https://eucolait.eu/userfiles/files/rajipupojazexusolejizazel.pdf
    • https://asiarsolutions.com/userfiles/file/44397273853.pdf
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160beba1f075b9---68899793256.pdf
    • https://mymango.ru/wp-content/plugins/super-forms/uploads/php/files/a573502242087f746eb425e6b00f78ac/rotorolixoligagogev.pdf
    • http://ceomit.com/fckupload/file/pimer.pdf
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/4ff46687622a75105a8a18e26ff0277b/dapafa.pdf
    • http://auksozvynas.lt/userfiles/file/zujojepo.pdf
    • http://pressvaluation.net/userfiles/file/burebimelowudalaga.pdf
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091b9d971f1f---80943216782.pdf
    • https://luxmarketing.agency/wp-content/plugins/super-forms/uploads/php/files/0toum54v8b5gq66g6pvuqvsogp/48233028197.pdf
    • http://hani-bee.com/userfiles/files/34783270014.pdf
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/jvj7vu761ebcnr17jpf2ie5f01/nukixibexetikutimakilotaz.pdf
    • http://msci.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/1608d664588ecd---vipafavugolezil.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=variance+calculator+probability+distribution
    • 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_off00013182.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13182 16792 bytes
font_01_sfnt_off00014999.bin
5b3764b57c380deb6d4ca3813467996abfd8a056e0b642ce601eee09d03a3e6d
pdf-font-stream PDF embedded font (sfnt) at offset 0x14999 10832 bytes
font_02_sfnt_off00016278.bin
fb2caab6588549ba8383dfb07dedc7e16baa32010f21295edfb2498a356dc189
pdf-font-stream PDF embedded font (sfnt) at offset 0x16278 19008 bytes