Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c12bda39e22d167…

MALICIOUS

PDF

91.2 KB Created: 2021-07-14 04:54:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0bb4db73f941d3d1b86935c5b0347274 SHA-1: 88c1389e7ae3234e3463410582c4163dc3ddb56f SHA-256: 1c12bda39e22d167145061216bb0853b58f70c7afeb0364181addc65ff7fc457
156 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to compromised websites, suggesting it's part of a link farm designed to redirect users to malicious content. The presence of external URIs and link farms points towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://allytemp.ru/uplcv?utm_term=erythrocytes+are+normocytic+and+normochromic
    • https://dtcprojects.com.au/wp-content/plugins/super-forms/uploads/php/files/4qkjg5c9rqor8mvpu9bl053gto/jivinuzevakusonorapu.pdf
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160db7b4e2d25d---zofijamimisekunolozo.pdf
    • https://rfcorporation.net/wp-content/plugins/super-forms/uploads/php/files/aa18afc76e74ba761da1866362a06e22/dupekakipuvevog.pdf
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079f8a376547---91949812271.pdf
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b8d98aa11e6---gisonepijorupoxex.pdf
    • http://pallenberg-busreisen.de/uploads/files/25547543651.pdf
    • https://www.myjamaicais.com/wp-content/plugins/super-forms/uploads/php/files/7a8fae074b5a4e3f660119aa39500794/rekadarogotori.pdf
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160bf7e70e3732---16098227277.pdf
    • https://roc.mn/uploads/files/gobes.pdf
    • http://platcometals.com/images/file/gobivo.pdf
    • http://uptownherndon.com/uploads/files/50405556223.pdf
    • https://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/dd6f6a8c148b92cb1126046811265cc3/gajakulagesarikudix.pdf
    • http://animationcoach.com/userfiles/file/39430630304.pdf
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a163c06729---82995957818.pdf
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/15c28b9faa5966e97091ce78aca82e95/66653967091.pdf
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16071f258b949b---seneborikatijaj.pdf
    • https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/8337039b838b261f33ad7efe20c4ab4e/tamuzunan.pdf
    • https://greshamgilessalon.com/wp-content/plugins/super-forms/uploads/php/files/7c450e1108afe0ac16a85193c1928fe5/45851164355.pdf
    • https://bahceneryaman.net/public/content-images/files/54601526618.pdf
    • http://www.moteco.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16072917033af9---8403960357.pdf
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad238423e30---zopufofuveka.pdf
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2033d3b37f---lovudobizegitenama.pdf
    • https://securitydm.rs/slicice/file/rigunelonuvejazopera.pdf
    • https://www.varishastalari.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f3514f185f---82385317294.pdf
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/160785b95ee19a---36117832734.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_off00010240.bin
a6f4ad51516ffc0034ae52ea9cc3ebad49f8c631137602611f07eab9b50c20db		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10240 10688 bytes
font_01_sfnt_off00011a9a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11A9A 16792 bytes
font_02_sfnt_off000132ac.bin
aee813d88fdd52a91da5157251ce459bfef76cbc616f79e169722b592b82166a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x132AC 17016 bytes

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