Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8f67bfb98d465d3…

MALICIOUS

PDF

73.6 KB Created: 2021-07-02 00:53:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6fdaa535c8f963e5faa1699af3fa2501 SHA-1: 53fc3641bf2e489d4ccd581520b4d0b077a976ad SHA-256: c8f67bfb98d465d33bc81366b19a90363cad492e7414229e7ad74dae762d31b3
156 Risk Score

Malware Insights

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

The PDF was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to numerous disposable or compromised domains, suggesting a phishing or malware distribution scheme. The presence of multiple links to potentially malicious sites reinforces the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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 http://xn--ob0bjxt9h99icicrvkksa421cwwp7hiv4d6a.net/ckfinder/userfiles/files/kivotusozozuvinezokazutaw.pdf
    • https://desertflying.club/wp-content/plugins/formcraft/file-upload/server/content/files/160a6cfe8beaac---89221480655.pdf
    • http://dental-forum.ru/userfiles/file/vekinokakejome.pdf
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608cfdef813e2---bodez.pdf
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160d0359d667e4---vatitokog.pdf
    • http://allasclub.com/campannas/file/60708074329.pdf
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c26476de095---79543412506.pdf
    • https://technok.cz/wp-content/plugins/super-forms/uploads/php/files/877ec6b558e9203541c35d368d7f602b/39794621236.pdf
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160d9056c13053---zutitudewabo.pdf
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16071ecef9593f---vazovajejatusediluv.pdf
    • http://akkoryazilim.com/userfiles/file/pemarutetuwazov.pdf
    • http://abacusnancy.com/userfiles/file/lebufewakemanozugikimew.pdf
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087abb4e51e8---xudulifoloperugoxetixetut.pdf
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7705917a6---34515610535.pdf
    • http://omni-links.com/images/blog//file/15066537212.pdf
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/lmt70leeqgc2f1pcnblb2anmf7/55068907935.pdf
    • http://nordicaluminium.ru/userfiles/file/59637970113.pdf
    • http://perles-del-beya.com/userfiles/file/mazexikurujunikelu.pdf
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cb377b585f2---kefoj.pdf
    • http://phongkhamducphuc.net/images/files/88389588195.pdf
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/16081c241d9638---bipogif.pdf
    • http://www.sandzthabapanel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606cbb2b9731a---wopodowuburajaxelinozudof.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=georgia+commercial+driver%27s+manual
    • 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_off0000bde1.bin
e6b3669bc26df3448fa4501eab804c1732cb018d34fe7300af8ac7f640eb6348
pdf-font-stream PDF embedded font (sfnt) at offset 0xBDE1 10856 bytes
font_01_sfnt_off0000d6ce.bin
8ed9d89ce8729ee2000ea680062e8998edef112433024f6c9d3bb4bae3d76060
pdf-font-stream PDF embedded font (sfnt) at offset 0xD6CE 16372 bytes
font_02_sfnt_off00010127.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10127 16792 bytes