Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c37d7afff79b790…

MALICIOUS

PDF

95.3 KB Created: 2021-06-28 06:55:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 815951dbbd0aa7c87436c6751dc5e35e SHA-1: c7cd6279087e8b029fccb5a63c0a38ac0d9f4d6f SHA-256: 0c37d7afff79b79091f4e4ef0e259d99b25b5523ea9c28589086bb38f22bea09
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories, indicating a phishing or redirection scheme. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to lure users to malicious sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9929

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://sportsht.com/userfiles/file/33280782793.pdf
    • https://festival.bg/fckeditorfiles/file/96329256837.pdf
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160d523759ddb5---wovaroginijopajepusifilo.pdf
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/aa5d232042e71fe2f7f6dfa4ec50f298/bimomuxitovotuzilewaxi.pdf
    • http://tweedehandswikkelaar.nl/app/webroot/files/userfiles/files/81194392017.pdf
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b9c467d8008---tafonalezibabifevizor.pdf
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/84c90d1e2c83bfd6f2ad0b400c0e5201/fazajixelevajifepuxog.pdf
    • https://www.focus.mu/wp-content/plugins/super-forms/uploads/php/files/30b3c189da6d09fcbed8c1ed25f0aa00/xijenoronixax.pdf
    • https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/0848e443312be3c01e657326cf2528bc/6259111743.pdf
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160a18560da8f7---zepafevimuju.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cff05f290d3---midenalimajebawasev.pdf
    • http://vyveva.eu/UserFiles/File/lanuwomejovifobogij.pdf
    • https://mannerfeltdesignteam.se/ckfinder/userfiles/files/fepexuvowajezow.pdf
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160bc7dbef3b49---17043192462.pdf
    • http://project-st.ru/userfiles/file/2349827062.pdf
    • http://thanuyentea.com/ckfinder/userfiles/files/5953483067.pdf
    • https://www.guestquesttravelmedia.com/wp-content/plugins/super-forms/uploads/php/files/kgvgfg3p565bq819oj4ogpt9lv/52471302202.pdf
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076173cc8990---97108287965.pdf
    • https://hanedantoptan.com/upload/files/kukakaxik.pdf
    • https://bamor.org/userfiles/file/tivemiwatapamefizix.pdf
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160822763a438a---dagofoginugeduluboletaje.pdf
    • http://www.homefacelifters.com/wp-content/plugins/super-forms/uploads/php/files/a74b8a7075e8199028f3c5b2c91f6b9d/pupen.pdf
    • http://www.empresasdelimpeza.info/wp-content/plugins/formcraft/file-upload/server/content/files/1608c738ae5850---musubo.pdf
    • http://myucpb.net/userfiles/file/36616048125.pdf
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1608b60f495f7c---56999672453.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=use+abstain+in+a+simple+sentence
    • 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_off0001144b.bin
72591cb48197eeeb8bb251395f0538d5baedc82153167059d6759000a0f6cc8f
pdf-font-stream PDF embedded font (sfnt) at offset 0x1144B 10464 bytes
font_01_sfnt_off00012bc8.bin
8a76b7ab1da243b571ae18db88c7f50ac78ce903204d501e943a94710313e109
pdf-font-stream PDF embedded font (sfnt) at offset 0x12BC8 16840 bytes
font_02_sfnt_off000157e3.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x157E3 16792 bytes