Malicious PDF — malware analysis report

Static analysis result for SHA-256 842a615efb8e40f8…

MALICIOUS

PDF

85.9 KB Created: 2021-08-05 06:00:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 08f671e686f49cbad4f0049e1c14eb47 SHA-1: d3f5bc9971f35aafd915efcb9e113cb0e63fbfde SHA-256: 842a615efb8e40f86970743e23e7772475e1237a15e7ddb24236ecedd8fb8ebc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a link farm pointing to numerous URLs, many hosted on compromised CMS platforms and disposable domains, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The file's structure and numerous external links are consistent with a malicious PDF designed to lure users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://amuseonline.com/absite/userfiles/file/83300834154.pdf
    • https://infravoip.com/wp-content/plugins/super-forms/uploads/php/files/f04f384e5b9221a6ecd6fd39121de336/tinunuzofovenerawimez.pdf
    • https://melz-feu.ru/upload/bowewabeb.pdf
    • http://khacdautron.com/Images_upload/files/72338548671.pdf
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/160a1be63e9e66---bunafatakola.pdf
    • https://theshamrockpublecco.it/file/degozafaxuveven.pdf
    • http://accessiblevehicleservices.com/userfiles/file/63135308710.pdf
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160deffe11f1bc---zimikuzofobunutizekovovux.pdf
    • http://ohmytour.kr/FileData/ckfinder/files/20210626_98788705655F545B.pdf
    • http://www.marcelasemper.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ec6d267b01---74708310079.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e283d6a478e---81879884947.pdf
    • http://sorokolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/fekubonuz.pdf
    • https://baust.edu.bd/app/webroot/ckfinder/userfiles/files/kezemulupinoras.pdf
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16073dc9529b31---67272152105.pdf
    • https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/7b43003ce366e08a39c63f4e10698b03/54650594941.pdf
    • https://ispartaprefabrik.com/ckfinder/upload/files/setojunuvadogomudojimudib.pdf
    • https://morethancleaningservices.com/wp-content/plugins/super-forms/uploads/php/files/c05f92554e35349839b06d0e529b634f/10927923720.pdf
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/3jvinn6t82v4slk965aetgn256/79869870297.pdf
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/9c26211fdf3d0472e94a8115b69839f7/2916070460.pdf
    • http://aircond.md/upload_fck/file/koxeniwip.pdf
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160ac3b7607e89---wasemixabi.pdf
    • https://www.dishdivvy.com/wp-content/plugins/super-forms/uploads/php/files/2eb548ac9a84ad2ba7f37849169194bc/nidureliwimepafavugakujaj.pdf
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096fae861f56---36602738277.pdf
    • https://bikinibody.be/wp-content/plugins/super-forms/uploads/php/files/8djc8d1lpuimalja2mj3kb88pb/81342487763.pdf
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16094dd637a11f---zesetenel.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=sturdevant+operative+dentistry+full+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_off0000eaa7.bin
3b339e6de38cdebf317946b251e8053bd5d28748bb3fb17407625018eff55b6d
pdf-font-stream PDF embedded font (sfnt) at offset 0xEAA7 17188 bytes
font_01_sfnt_off00011795.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11795 16792 bytes
font_02_sfnt_off00012fac.bin
efe1a07b06741ddb36f02d8a51bbc769b8a9e195b21f5eb85eff9b8d7c328d06
pdf-font-stream PDF embedded font (sfnt) at offset 0x12FAC 10848 bytes