Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8169edecfe2ebea…

MALICIOUS

PDF

90.3 KB Created: 2021-06-30 01:00:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6e7266c93f5dd64d33aa19730c6afb8d SHA-1: e2b93d56c8fa45d4da8317622ec607a7bbb44df7 SHA-256: b8169edecfe2ebeaaef2a6f606ae7b0095ae08d8c02bd93a168125f2fd5a402a
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to compromised WordPress sites, suggesting an attempt to trick users into downloading further malicious content. ClamAV detected this file as Pdf.Phishing.Trojan, and ML classification strongly indicated maliciousness. The presence of embedded URLs and the nature of the heuristics point towards a phishing or credential harvesting campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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.
  • 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://huntic.ru/uplcv?utm_term=the+best+confectionery+in+the+world
    • http://olimpic.hu/ckfinder/userfiles/files/95677218789.pdf
    • http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c578042644f---8709479700.pdf
    • http://thamdinhgiadaiquang.com/img/files/zubafovagonaganiseras.pdf
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac89e2660b5---99651451704.pdf
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5af3df0388---motomaporadina.pdf
    • http://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f3f81a0376---pasoxesufajekudar.pdf
    • https://whiteplacard.com/UserFiles/file/vasofunoragibowagogaf.pdf
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/3493749267c8e20a2a44ed588838f19c/45043819125.pdf
    • http://countrysquirefoods.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609bcade44841---xizupemit.pdf
    • https://www.straightmyteeth.eu/wp-content/plugins/super-forms/uploads/php/files/92b85072336df18b4b8845e56559ebce/mewodapatakejusizaf.pdf
    • http://hotstamping.pl/files/file/58190338020.pdf
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b39a1b0fb6---29342758855.pdf
    • https://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/12f522e49eae906c6b22792fda941e69/27874875731.pdf
    • https://acryl-bg.com/userfiles/file/22261221532.pdf
    • http://cesnek-vysocina.cz/UserFiles/File/bedexobekubilidatibabikur.pdf
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160828600477a8---30226576284.pdf
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078210b7a8fb---76416587940.pdf
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607ab61eb583e---fetajewube.pdf
    • http://richmediahouse.com/admin/uploads/file/ponusavuperasenusil.pdf
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16082f9b17e582---jivuwuwenejanowoxo.pdf
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d55565a208---jevudapotiduko.pdf
    • http://zaragozalawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/matapomoperarobuk.pdf
    • http://myconnect-thailand.com/image/upload/File/fagogobifewod.pdf
    • http://yuhenganquan.com/userfiles/file/20210529153718_1815714696.pdf
    • https://www.charityweiss.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d437cd8d1bb---xowowon.pdf
    • http://zap-interactive.com/uploads/files/paposizasovemuvijemesezux.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_off0000fc5c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFC5C 16792 bytes
font_01_sfnt_off0001146e.bin
b276c4622fd067a44a85d85af7b48c1c944202c80678108e7a6a71cf02a2b39e
pdf-font-stream PDF embedded font (sfnt) at offset 0x1146E 17780 bytes
font_02_sfnt_off0001434a.bin
4b3eaf7523879ed2b190a1f2ace441714f875e2cbbb8e93c9c5d454ce28b7f21
pdf-font-stream PDF embedded font (sfnt) at offset 0x1434A 10716 bytes