Malicious PDF — malware analysis report

Static analysis result for SHA-256 f34ae437867cc87d…

MALICIOUS

PDF

84.4 KB Created: 2021-08-31 20:07:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: fae2f2181f17cf8a76f7e0d5929486d3 SHA-1: 77b2457ea0bd0b34c6af96d272ca2445c76ed968 SHA-256: f34ae437867cc87d01f359b520d95dd1efb5e03a5bfe46ef0e164ede65393d34
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites, suggesting a phishing or malicious redirection scheme. The ML classifier and ClamAV detection strongly indicate malicious intent. The primary attack pattern involves luring users to external, potentially malicious, websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

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://sbriz.ru/userfiles/file/dinokudunifojogusebudig.pdf In PDF document text
    • http://bhs-class1957.com/clients/35434/File/riritibobapumigo.pdfIn PDF document text
    • http://hurtglass.pl/upload/file/vitivikir.pdfIn PDF document text
    • https://cairparavel.ro/app/webroot/files/userfiles/files/botejaranoxamupovubizawi.pdfIn PDF document text
    • http://www.ferm-matic.fr/upload/file/78636690654.pdfIn PDF document text
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f84b07b6fbf---vibunapekivub.pdfIn PDF document text
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/58e78e6a58d9d59ca818d5c44bd3b4f5/sugetizeximepupezukur.pdfIn PDF document text
    • http://e2ingenieros.com/ckfinder/userfiles/files/pepapegesuzevugujimuxobud.pdfIn PDF document text
    • https://blueridgelightingandcontrols.com/wp-content/plugins/super-forms/uploads/php/files/b0979543d6e5611873435b869be9b27d/nogim.pdfIn PDF document text
    • https://www.straightmyteeth.eu/wp-content/plugins/super-forms/uploads/php/files/8438ea210578e7436d8775c51726f7ab/4036500570.pdfIn PDF document text
    • https://zlatartopalovic.rs//files/70213110566.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612d0027c31ec---1433241151.pdfIn PDF document text
    • http://interel-rus.ru/test/sites/default/files/file/varameloxisopuga.pdfIn PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1611523e20c891---91795732694.pdfIn PDF document text
    • http://modern-pro.ru/files/file/fizefariweputim.pdfIn PDF document text
    • http://thuduchouse.vn/pics/file/segezesasesob.pdfIn PDF document text
    • https://presentkompaniet.com/img/content/file/mebubojurijijotomewapulu.pdfIn PDF document text
    • https://blnk.eu/userfiles/files/derodizi.pdfIn PDF document text
    • https://www.thic.net/plugin/ce1/ckfinder/userfiles/files/36941372235.pdfIn PDF document text
    • http://deltastal.ru/userfiles/file/vunorewixafigope.pdfIn PDF document text
    • https://wemservice.com/ckfinder/userfiles/files/mujawenenas.pdfIn PDF document text
    • http://tele-video.ru/upload/files/sizurexejarugikufaxo.pdfIn PDF document text
    • https://agenciaboom.com/wp-content/plugins/super-forms/uploads/php/files/r9q7mc9ba259k9eanpkv8hmov4/2656382105.pdfIn PDF document text
    • http://cetinelektrik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160ab2fe1a82d1---68329737890.pdfIn PDF document text
    • http://bishnutoursandtravels.in/userfiles/file/41779857855.pdfIn PDF document text
    • http://hyperasp.net/userfiles/file/vudup.pdfIn PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bafd8c7d0de---33414054806.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=perfect+two+lyrics+mp3+downloadPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e4c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4C4 11156 bytes
SHA-256: a6e2349752e8b057c5801e54dfbf65bfd6c6ddf9bc08018c020ab281f4dd4470
font_01_sfnt_off0000feeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEEB 17272 bytes
SHA-256: 84ad94c61d81b1eeb59d4e015d1457fbdfaf4382bd9e198543b0710d67d7494f
font_02_sfnt_off00012bd2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BD2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1