Malicious PDF — malware analysis report

Static analysis result for SHA-256 1148314c4f1c2441…

MALICIOUS

PDF

81.2 KB Created: 2021-08-26 03:56:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 05b609123300d52a3dd82bf69fef56e3 SHA-1: cf99597343b763d8b40592c6994f9e0b570fb4ea SHA-256: 1148314c4f1c244150be2006910628d5ea154df0c1b5a06cae818277247e15cf
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to compromised websites or disposable domains, suggesting a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://queure.ru/uplcv?utm_term=what+color+makes+yellow+green PDF link annotation
    • http://sattamatkapatti.com/userfiles/file/rujiwirosek.pdfIn PDF document text
    • https://ajambary.com/userfiles/file/lexibamewidinasusedi.pdfIn PDF document text
    • http://swhwsolution.it/ckeditor-ckfinder-integration/uploads/files/92438012156.pdfIn PDF document text
    • http://zhuoer.ltd/userfiles/file/dawenexilijomexowifuwuru.pdfIn PDF document text
    • https://www.msolartop.cz/wp-content/plugins/formcraft/file-upload/server/content/files/16077551cc9e4f---16170524538.pdfIn PDF document text
    • https://rclurie.com/wp-content/plugins/super-forms/uploads/php/files/e9edb0216e21ec767c90df298c5d3d8a/4558520720.pdfIn PDF document text
    • https://atlastoursntravels.com/userfiles/file/dedugakufidefoxomigoxavuw.pdfIn PDF document text
    • https://szaniterplaza.hu/ckfinder/userfiles/files/28808664320.pdfIn PDF document text
    • http://www.moyekolodin.com/files/58569855508.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/160909171b3db0---51193974348.pdfIn PDF document text
    • https://baileyelectrical.services/wp-content/plugins/super-forms/uploads/php/files/ds8bsh2tdjte63lbenkq041guq/rarasalowokonilisasapow.pdfIn PDF document text
    • https://mymango.ru/wp-content/plugins/super-forms/uploads/php/files/52d0e55fe024ac92b9e6b953859de260/xuzozitolelemifupe.pdfIn PDF document text
    • http://rmgoals.com/userfiles/files/peperom.pdfIn PDF document text
    • http://amoy-art.com/Upload/file/jodupapajumifejibi.pdfIn PDF document text
    • http://hengtaixin.com/HangShun/ckfinder/userfiles/files/67422063888.pdfIn PDF document text
    • http://bamt.be/wp-content/plugins/formcraft/file-upload/server/content/files/1607b352b74670---8505130159.pdfIn PDF document text
    • http://barudan.hk/UploadFile/file/20210530043739647.pdfIn PDF document text
    • http://innotec-industrie.be/userfiles/file/fiwadekozafatididoke.pdfIn PDF document text
    • http://chupanhnoithat.vn/upload/files/kakukovibovomabunojareri.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609a4b56364b0---jidowexulokitate.pdfIn PDF document text
    • https://hetodon.com/fckeditorfiles/file/tatinemovar.pdfIn PDF document text
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1606d5169e8d2b---19751883640.pdfIn PDF document text
    • https://intervalhousehamilton.org/ckfinder/userfiles/files/vivadubezimajuvupenezuve.pdfIn PDF document text
    • https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/b6n24oo6sjgc05k1ublfnj7mja/dubugejutidevakebas.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d94c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD94C 16424 bytes
SHA-256: 09f9c9534492ca9741f9a7c24c1cf5e4c29fba03a9185de83bf87f1bc10b252a
font_01_sfnt_off00010403.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10403 10872 bytes
SHA-256: 9a171549743e59835fa0e428bd0a705a01907eaeaefdaf094ffe06fd8ce90343
font_02_sfnt_off00011d22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D22 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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