Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c4873e67538ab49…

MALICIOUS

PDF

87.4 KB Created: 2021-07-03 18:46:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 720578bd4b128710adfefa95c84f5e36 SHA-1: 42913961e89c4ab222e3cd2e8a06b219d9774748 SHA-256: 7c4873e67538ab4923a066fd38b1b2baba7476c3e6c90de759ae4f2d16b611cf
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious. It functions as a link farm, containing numerous URLs that point to compromised WordPress sites, specifically within form upload directories. These links are likely intended to lead users to phishing pages or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://crewmak.ru/uplcv?utm_term=best+free+anime+streaming+sites
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a599b534662---xobidalikofi.pdf
    • https://gresathouse.com/wp-content/plugins/super-forms/uploads/php/files/51db7faabf74d51f19a1b964a98af77e/gasorake.pdf
    • http://synerfreight.com/syner_upload/images/files/40087839341.pdf
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160afe24d60264---85282083748.pdf
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160c6fde53c11e---13463594050.pdf
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/160a8c27299b39---liruxabazakumezijudepu.pdf
    • https://amenajarisiconstructii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160852ffb1ca93---20032787899.pdf
    • https://www.clubmanizales.com.co/wp-content/plugins/formcraft/file-upload/server/content/files/160bb5690d766f---wivalalozufukovew.pdf
    • https://hmjrgoldhockey.org/wp-content/plugins/super-forms/uploads/php/files/e09ba53f8dbf48e830749639a2de55a7/15334434054.pdf
    • https://xn--mietkndigungsrecht-best-gpc.de/userfiles/file/xajisoditadam.pdf
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/5v7j26hi2338i30ohnfs9ri943/pujudofefuga.pdf
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5a880305ba---xitibizevozudu.pdf
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/1lvf00oopsje3o3gnj84rj3gd9/potenolubiweporazirer.pdf
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/0rsp5ke902in75gn09pr77qn6a/13365571270.pdf
    • https://www.jscorporation.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/1608629f97f835---61316932478.pdf
    • http://hit-air.pro/ckfinder/userfiles/files/44716841605.pdf
    • http://greenbrier101.com/userimages/fegukoramakuvag.pdf
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/16095a04bf3a8c---78842609935.pdf
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/31c6d2d3143574d8420dfd43322a0439/sumuvogifonopevazol.pdf
    • https://krimgranit.ru/wp-content/plugins/super-forms/uploads/php/files/88b4cb40a51b29744e3ae679ac216d30/57206417243.pdf
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a9e40a04694---74349245868.pdf
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089a03c0b3c1---68892709930.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_off0000f360.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF360 16792 bytes
font_01_sfnt_off00010b72.bin
7132a4fd4a5e2be52d3abb7bfafca72a952789b78eab9bd7d6f22ecfd9f072cb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10B72 17324 bytes
font_02_sfnt_off000138a9.bin
e90fccf0a6c35ab4ab52c5dd5ba527fc78927fe9bec2cafd4c83c815ea9dfeb0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x138A9 10444 bytes

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