Malicious PDF — malware analysis report

Static analysis result for SHA-256 c697304b7bb7084a…

MALICIOUS

PDF

86.3 KB Created: 2021-06-29 07:21:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ed0a1cea9d44d6e3c5e79a8d19a15509 SHA-1: 1313003a9133408938001a36d61179b32f41fc70 SHA-256: c697304b7bb7084a3f20fa6b5a386c81a1952908b7801bde12c157c7b930a81c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress sites used for hosting. This suggests a phishing or malware distribution scheme, where users are lured to click on links that may lead to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://crewmak.ru/uplcv?utm_term=how+to+add+pdf+to+powerpoint+slide
    • http://smartpaintingplus.com/userfiles/files/gevuruxarevefuf.pdf
    • https://investainternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609661d7cbc8a---58381348409.pdf
    • https://majorsagilekvaros.hu/uploads/file/gulutelasaxovolu.pdf
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/16077ade99fcef---76265093843.pdf
    • https://free-spirit-city.eu/uploads/wysiwyg/files/xasejinife.pdf
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/qclscob0edm39c1hc03ludgrlf/54943334470.pdf
    • https://upchealth.net/wp-content/plugins/super-forms/uploads/php/files/d47eea80912451b7b85eaa702f303d6f/rogudajerogu.pdf
    • http://www.advancedevents.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609758bf878e8---digikenijekutiwuwoxugujew.pdf
    • https://hgb.se/filer/file/37832923528.pdf
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a638b14ff79---soluwibezapefizibed.pdf
    • http://avtoarka.ru/wp-content/plugins/super-forms/uploads/php/files/da1e4f03c5489dbd7f560986a471aeaa/51723501399.pdf
    • http://pc75.net/upfiles/file/1621367315.pdf
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079dc8b6fb30---tezopewa.pdf
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070ab64174d6---46931814530.pdf
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7574cc56a---waxazamogakovoxuzununuw.pdf
    • http://nicenpos.com/userData/board/file/winolapabiboturuxini.pdf
    • https://eseninternational.com/uploads/files/38424564578.pdf
    • https://mimpishio2.net/contents//files/kaxumutimefatew.pdf
    • http://kiuanai.com/userfiles/file/72859913867.pdf
    • https://asiajitutop.com/contents//files/67133446665.pdf
    • http://arisutour.com/ckupload/files/21396521414.pdf
    • http://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606da6d26ea22---62102182454.pdf
    • http://teledirk.com/d/files/16806754589.pdf
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160ade1e1796af---19858981976.pdf
    • http://kstarsmall.net/userfiles/file///70241980262.pdf
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/160a5db974d51b---87892346168.pdf
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2964d66393---92757524064.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_off0000ede1.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEDE1 16792 bytes
font_01_sfnt_off000105f8.bin
b84af10988f3798b6e797e2d0e36fd8b9b61e1c054d7573e32e9990b910bb54c
pdf-font-stream PDF embedded font (sfnt) at offset 0x105F8 10568 bytes
font_02_sfnt_off00011e35.bin
bdf75f91ff40b33e7e39dce048354e2eb4baa7612802aea1b1217563af933277
pdf-font-stream PDF embedded font (sfnt) at offset 0x11E35 17392 bytes