Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf9ea566de0b251c…

MALICIOUS

PDF

83.8 KB Created: 2021-09-07 17:23:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 11a2c294f9840149eac6f81bcd831257 SHA-1: 8325add9a78a114cbf2c9cf5cc5c6a2c704c033d SHA-256: bf9ea566de0b251cd9fdb58fd06c30841db0d30539351f58c1fc1ae477d85941
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm pointing to compromised WordPress upload storage, suggesting an attempt to distribute further malicious content or redirect users to phishing pages. While no scripts were extracted, the presence of numerous links to potentially compromised sites indicates a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac90fb5da1a---73601500686.pdf
    • http://shopabrang.com/images/files/tojanetobeleli.pdf
    • http://lepal.sk/ckfinder/userfiles/files/sujikexugu.pdf
    • http://glovimex.com/uploads/ckfinder/files/88723345655.pdf
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/70e2954664c02eacf563e4cfa49e79df/guzepedubulakevep.pdf
    • https://elemental-ia.com/userfiles/file/68559938568.pdf
    • http://abimobiliare.pl/pliki/File/xufinanuxurapep.pdf
    • https://burgas-remonti.com/userfiles/file/vufatozupiferaxosuwexamej.pdf
    • https://europeancustomtailor.com/wp-content/plugins/super-forms/uploads/php/files/c77a592ca0a2dfe2f462309042282723/31699467597.pdf
    • http://diskacme.dk/images/upload/file/80763896981.pdf
    • https://voicelux.ru/wp-content/plugins/super-forms/uploads/php/files/c425d54cf3bedfa83dfaa855e3c67f6b/furupa.pdf
    • https://brokenspoke.com/wp-content/plugins/super-forms/uploads/php/files/75dcb13f2ed490d624c57d55c8669719/vetizomisipipegat.pdf
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ffc3c55e0de---20465260763.pdf
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/6ce5febd76409182bc57485aa1786604/rozuzojabatuz.pdf
    • https://sfeerweter.nl/userfiles/files/15159501025.pdf
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3283f8ac4b---56970040911.pdf
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/1613269e839cf5---lusiluvalajidowejuvot.pdf
    • http://reafamily.lt/ckfinder/userfiles/files/wizevasazotuzoririlo.pdf
    • http://legendtec-eg.com/wp-content/plugins/super-forms/uploads/php/files/b9o85r8bmmurbdhsnoinnhnfh4/57187844872.pdf
    • https://www.breastcancerfoundation.in/wp-content/plugins/super-forms/uploads/php/files/193cdf592bd717eb016c1c8962408cbc/wawerutitipojawufevopi.pdf
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/7rtggu7rirk59jbj15asiplf1t/guduzedodokazudulemoj.pdf
    • https://alate.org/admin/fckeditor/editorfile/16545969942.pdf
    • http://nofatrans-int.com/userfiles/file/35569997613.pdf
    • http://anapharmata.hu/ckfinder/core/connector/php/files/99168399981.pdf
    • https://www.sesc.com.ua/wp-content/plugins/super-forms/uploads/php/files/r30eaqf8gufnsnpojk0d739rr1/fomizegotulok.pdf
    • https://www.prshots.com/ckfinder/userfiles/files/80462576691.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=catalogo+fidaty+esselunga+2017+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_off0000dd38.bin
47442376fa933a1a7d67e793ec91e14605071d4aa40937d081830bcb32b7a93e
pdf-font-stream PDF embedded font (sfnt) at offset 0xDD38 18636 bytes
font_01_sfnt_off00010df5.bin
c3f00afa9e7359136a196283fbf07b33b0c7c942c8f4bbf6a079758d4543e804
pdf-font-stream PDF embedded font (sfnt) at offset 0x10DF5 11160 bytes
font_02_sfnt_off0001282d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1282D 16792 bytes