Malicious PDF — malware analysis report

Static analysis result for SHA-256 0842dc1167ef86e3…

MALICIOUS

PDF

84.2 KB Created: 2021-09-06 21:15:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 74033d1d0c270eb6a83a8d2d38d3b512 SHA-1: 7e4c006d9acb6fa215faa8a9dce1f3b87b79a3d8 SHA-256: 0842dc1167ef86e3d10282c78702c964468dde6846a357a9dd4cf4dd486e7e68
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF was flagged by a machine learning classifier and ClamAV as malicious, indicating it likely contains malicious content or exploits. The heuristics reveal it functions as a link farm, with numerous URLs pointing to various domains, some of which are associated with compromised CMS uploads or disposable hosting. This suggests an attempt to lure users to external sites for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://aarogyamedico.com/userfiles/file/71304405863.pdf
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606fa87512ce8---kuvigikiwavusomumi.pdf
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609091c08f68a---xilixasedom.pdf
    • http://cn-junsheng.com/upload/file///202162165034041.pdf
    • http://zaun-produzent.de/userfiles/file/16193390946.pdf
    • https://essaidafm.com/uploads/FCK_files/file/dogisagamijudokaz.pdf
    • https://cmetrix.net/ckfinder/userfiles/files/73562126695.pdf
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608331a65e2aa---dexaf.pdf
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b83dcaf3159---xatejoxeluz.pdf
    • https://netiko.fr/img/Data/file/73732436434.pdf
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c9d8d710a29---86102311550.pdf
    • http://demirlermetal.com/resimler/files/mebegufumegivofupu.pdf
    • https://culturasiapamplona.com/guiarte_userfiles/files/54461659518.pdf
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/f7bccfb46e93ea8bd5da7227247731c2/28731434135.pdf
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/5d08eff52f9c7857b8eb1043ab92483f/10163744642.pdf
    • http://sattamatkapatti.com/userfiles/file/wedopuriwiwapavotupaw.pdf
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a79860d9124---55393934715.pdf
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160fe2c3ab364f---1194091562.pdf
    • http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/f35hrdj9nr0j8n8vj7m15pgs54/94239030540.pdf
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/16073cd0151721---5439177882.pdf
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa84e0c3cee---82633774182.pdf
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/a045d6638e7028759ec18266eb7f5ffa/nagubapukunizikevibu.pdf
    • https://baconbites.com/wp-content/plugins/super-forms/uploads/php/files/h4d1rr6seu6g5shvipkveao883/64365274423.pdf
    • https://legouic-peinture.fr/userfiles/file/74875281780.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=google+self+driving+car+ieee+paper+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_off0000e20c.bin
08ac4b3dd4b533ff0663ffdc57d372356154cea2e97466a9e9e1628dd5190d6f
pdf-font-stream PDF embedded font (sfnt) at offset 0xE20C 18260 bytes
font_01_sfnt_off000111e6.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x111E6 16792 bytes
font_02_sfnt_off000129fd.bin
526f86c02979d63464d8a33ae590d6e275ba033793c12c8841d0e7e3f618efff
pdf-font-stream PDF embedded font (sfnt) at offset 0x129FD 10800 bytes