Malicious PDF — malware analysis report

Static analysis result for SHA-256 57c6b145271746c7…

MALICIOUS

PDF

77.3 KB Created: 2021-07-14 03:56:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 15fe1900816b889bdc06b02ecbef8025 SHA-1: 43750662fa177e089db987a559b00e3b764e359a SHA-256: 57c6b145271746c70b02163a7e44e441164684dccd29b7cd44b51a6713f00d01
156 Risk Score

Malware Insights

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

The PDF contains a link farm directing to multiple domains, several of which are hosted on compromised CMS upload storage or appear to be disposable. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, and the document body was unreadable, but the heuristic findings and numerous URLs are sufficient to assess the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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 https://tdsns.ru/userfiles/file/vureviridigovufizapizugil.pdf
    • https://szekszardportal.hu/userfiles/file/guxiti.pdf
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b93ef42aaa---4076211951.pdf
    • http://appletechsolutions.com/userfiles/file/werugoxituwipepuzonimu.pdf
    • https://iphonerepairservice.nl/app/webroot/files/userfiles/files/75977303357.pdf
    • http://thongthien.vn/upload/files/jetatukaserof.pdf
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/04bbaf7456a6841fdb763d0b305d7e19/monewivapibajaz.pdf
    • http://falconfam.com/ckfinder/userfiles/files/79332127458.pdf
    • http://pytextiles.com/userfiles/file/pinurotisanuwaxujudose.pdf
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/i72emk6sok8e9nft3tr6dr5o18/jafujoxagelipaxuxagine.pdf
    • https://costumeworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e70902170e---vimovoj.pdf
    • https://thehamptonsbloomington.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adcb8623b71---tuxidifepabezaf.pdf
    • http://primebrokeragetx.com/ckfinder/userfiles/files/povavusuvep.pdf
    • https://xn--80adj7cxa.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/314aed2726044af5d52ab89c3b07494c/74006858398.pdf
    • https://www.arc-welding.co.uk/wp-content/plugins/super-forms/uploads/php/files/sj3unsir2c9cj27134fi4ukv1j/lirewudatarozerizobofod.pdf
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/16075f08ddb948---zosuripudotaw.pdf
    • http://koszyczarek.pl/userfiles/file/62966038183.pdf
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160bb1395e3fe2---tinumaravemeguz.pdf
    • https://systematix.pl/userfiles/file/jefeguxoseminiwe.pdf
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/160cac165805c3---xalabawabilikesukopeleno.pdf
    • https://scriptdd.com/_file/file/mulezarasirusonibase.pdf
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083ce5bb755d---wekamuvetadinaw.pdf
    • https://tocgia247.com/wp-content/plugins/super-forms/uploads/php/files/4fg8l8d8r9p338a93rp7mejrjg/21483596300.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=the+weekend+song+50+shades+of+grey
    • 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_off0000ca3a.bin
2945d35240e677b399b025525083ba3a1c225938e3dfbc3b60277de19fa64b8e
pdf-font-stream PDF embedded font (sfnt) at offset 0xCA3A 16996 bytes
font_01_sfnt_off0000f67e.bin
78ed524cb9dd9642b9b6e9d3958f06580f1ed909df0376ba23bfb4e1a696ef5f
pdf-font-stream PDF embedded font (sfnt) at offset 0xF67E 10908 bytes
font_02_sfnt_off00010fa0.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10FA0 16792 bytes