Malicious PDF — malware analysis report

Static analysis result for SHA-256 60ab8504e1c3e3e8…

MALICIOUS

PDF

84.9 KB Created: 2021-06-26 07:11:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a03f73b4b9a1a9a17ec9ecbb0c0f3ec7 SHA-1: e06f9587a3c3189a21b25b0dcbaa929cc0c37da2 SHA-256: 60ab8504e1c3e3e8efea6fea500c344a3a13abb0e84d975f39526945149b7130
156 Risk Score

Malware Insights

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

The PDF file contains a link farm with numerous URLs, many pointing to compromised CMS upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is heavily obfuscated and unreadable, providing no direct user-facing content, but the presence of external links and the heuristic firings are sufficient to assess its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://mabifitness.it/userfiles/files/1530334764.pdf
    • https://anukulagrotech.com/userfiles/file/babiraboruxuwilur.pdf
    • http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083e2f278249---tuwelemisedujoxa.pdf
    • https://socialchangefactory.org/wp-content/plugins/super-forms/uploads/php/files/c7a72d9b385f2130c64a7bd1816dfead/nozupokenafaso.pdf
    • http://edgecs.net/documents/61965935356.pdf
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/aikn77algi42g9t2gftmcivovq/11834226231.pdf
    • http://drsuthichai.com/userfiles/files/febexamusirofilat.pdf
    • http://xn--365-pn7mwb654m2qn.com/ckupload/files/josidigetima.pdf
    • https://deconkhoemanh.com/wp-content/plugins/super-forms/uploads/php/files/sfdkehcnl4i5f3hh2nt9chkq0u/xiwifav.pdf
    • https://gearforfree.com/wp-content/plugins/super-forms/uploads/php/files/fpqbhk9ce23un6v4l1ns9at9dr/4782920253.pdf
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/3ef7f4bf351cd691387b9eb74f2c80cb/vumetalalizozabojufa.pdf
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16089d3b360a77---tirifolojokinapabovo.pdf
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160907e696575c---kegexojugodoboparofux.pdf
    • https://tomas-music.com/contents//files/20260661254.pdf
    • https://fmpride.com/wp-content/plugins/super-forms/uploads/php/files/3e661b6d43d7258c4d2f2f3d996b9552/53369826103.pdf
    • https://www.helpforbusymums.com/wp-content/plugins/super-forms/uploads/php/files/52471d2b5f61739eb8d77148a8a7d511/64078023132.pdf
    • http://provia-events.de/pics/fotos/1/file/29180395178.pdf
    • https://pensionatiitalianiinportogallo.it/wp-content/plugins/super-forms/uploads/php/files/bdb2b2f1c9cccb6a3b0d3b026ffb908f/negiwovulajozaderakivi.pdf
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/160b898dc19bd4---80869256243.pdf
    • http://praconsulgroup.ru/pict/file/22101773225.pdf
    • http://cartonwrappingmachine.com/userfiles/file/finas.pdf
    • http://klefmarken.se/upload/file/xirar.pdf
    • http://www.cenlaenvironmental.com/siteuploads/editorimg/file/rejopufawinuzadidob.pdf
    • http://ophirtonhotel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607d61f9e77f5---defelesuwojitoxiduluwidi.pdf
    • http://gps-tw.com/CKEdit/upload/files/weranirepakilawebaninemef.pdf
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160764d1d63317---15591391087.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=small+epigastric+hernia
    • 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_off0000ec4d.bin
6a682d93cfcd061d874e9af11b7734f623889a37edf1151767c91abf536c5ad2
pdf-font-stream PDF embedded font (sfnt) at offset 0xEC4D 16108 bytes
font_01_sfnt_off000115b4.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x115B4 16792 bytes
font_02_sfnt_off00012dcb.bin
6d9ef5678b6787e5c2ea60031100f6fdd76db14740aac185822e9f8aff1732ab
pdf-font-stream PDF embedded font (sfnt) at offset 0x12DCB 10776 bytes