Malicious PDF — malware analysis report

Static analysis result for SHA-256 d35241970c9d3d39…

MALICIOUS

PDF

73.4 KB Created: 2021-07-02 16:55:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: bd3d38f55aa8d7c4270fc3e3dd33ec53 SHA-1: abb482690ca513246f7278c559367febeabbb44b SHA-256: d35241970c9d3d3961a69dfda54e73d79036462b03353c4eaa23cc0d746c6e16
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised WordPress sites hosting other PDFs. The 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics indicate a pattern of using link farms on potentially compromised infrastructure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to lure users to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c504ba7c6f2---xomilafedogukazanor.pdf
    • http://guides2alpes.org/uploads/file/96300710017.pdf
    • http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/4d084d3f487b2217a648695454412b4c/terofesiku.pdf
    • https://janeunchained.com/wp-content/plugins/super-forms/uploads/php/files/jf8sej2io5mpnjegh0uk2a8ou8/kedizipojuvevenuwakikupe.pdf
    • http://akcjonariusz.com/UserFiles/file/rosifusobefodenav.pdf
    • https://patriciobanados.cl/upload/file/
    • https://prsnashville.com/wp-content/plugins/super-forms/uploads/php/files/8d73f4c5a9445666af4e64775f121914/61414246686.pdf
    • http://am-assets.com/aom/magnolia/userfiles/file/zisevuvisebokemetuko.pdf
    • http://tradeweb.es/userfiles/file/kuzozulimerenox.pdf
    • http://btc-ltd.com/upload/file/38486649445.pdf
    • https://www.harnoordesigns.com/wp-content/plugins/super-forms/uploads/php/files/dg1ur2dumrthm4vejibfqdktu3/sozunebemop.pdf
    • https://flexrocksrollovers.com/wp-content/plugins/super-forms/uploads/php/files/deeslo6qas2784nlqail3rvk98/34336575212.pdf
    • https://delaneyllc.com/ckfinder/userfiles/files/98064244322.pdf
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ead38f2a51---67269050547.pdf
    • http://munnarinfo.in/userfiles/file/16605063312.pdf
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab930c8cf68---74070922777.pdf
    • https://choiceenergynetwork.com/wp-content/plugins/super-forms/uploads/php/files/8bfcce3fb03407d7b6c5601446f364af/depobovevesita.pdf
    • https://lightspec.com/wp-content/plugins/super-forms/uploads/php/files/da40effeedb65250150cd73d50f302f1/tubonafamidilenitabit.pdf
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/e4afcbb7e05aa79fe560862b0b8e4cee/51825374820.pdf
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f660b0b228---99116772027.pdf
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607574a71358c---gotolaten.pdf
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c96604225c8---rokurutirisaviduzu.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=separation+of+mixtures+worksheet+answer+key
    • 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_off0000be63.bin
1220bd75ffbc5bacb9dff63b15a92c66fd2f7dc2a5075747aa57b1be299f05d0
pdf-font-stream PDF embedded font (sfnt) at offset 0xBE63 11148 bytes
font_01_sfnt_off0000d85b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD85B 16792 bytes
font_02_sfnt_off0000f06d.bin
d37a42288acf19266d5690bde126ffb311b0a4c85d95a607e7c371873004415e
pdf-font-stream PDF embedded font (sfnt) at offset 0xF06D 15608 bytes