Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b897dadc64cf5a5…

MALICIOUS

PDF

174.1 KB Created: 2021-07-02 16:52:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2f354fcceba52f1f794db83c9d291e83 SHA-1: 1cad32456a7c07687c74780f8f58081f64013a17 SHA-256: 8b897dadc64cf5a53e29d51521bf08ac947280644954d6c37b673fe0a3bf31bf
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1055.012 Process Injection

The PDF contains numerous embedded URLs, many of which point to compromised WordPress upload directories or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to 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 0.9727

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://floridainvestment.cz/files/file/313070237.pdf
    • https://viajespereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a782856fb1c---70597797824.pdf
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/160aef05402c24---vawatinuzawokaf.pdf
    • https://aymsoft.us/aym_image/files/47862327809.pdf
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160c17ae18750a---78155534564.pdf
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/44891e38d3f216f4dfce8a3238d696b4/tovixidotetulowonoxude.pdf
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/h3c2up8i1tj2j3c9ppfid1m5t1/teromaserata.pdf
    • https://www.harnoordesigns.com/wp-content/plugins/super-forms/uploads/php/files/qb9oqv2fjsg6vndc5kjsop69a4/79264029738.pdf
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/2jqi8k2q0n2uokg1r82qhu5h2u/45024732800.pdf
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083e6d7f3543---vomorinolenavuva.pdf
    • https://howardsteeves.com/wp-content/plugins/super-forms/uploads/php/files/bbd8bd10417c0791c5566c7da338cd58/11950106956.pdf
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16084e27c250ea---bepebufajusesuvezuxi.pdf
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fac5e7dbdd---sesalugugapagiporevojewi.pdf
    • https://sharidendesignasphalt.com/wp-content/plugins/super-forms/uploads/php/files/fab81e493c63ed5891cfee997e8d836a/jevavupesojup.pdf
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1609da5dc4e7c3---93360624942.pdf
    • http://a-aqua.fr/ressource/site-image/files/13910602088.pdf
    • http://weifong.tw/fckimages/file/86614354508.pdf
    • https://haltia.mx/sii/ckfinder/userfiles/files/zovowopugoduwumeposuneg.pdf
    • https://crownprolaw.com/userfiles/Proj_Name//files/fubijapaj.pdf
    • https://www.bakirkoytemsilcisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077cf26096a9---sufewebefexa.pdf
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/6c51ncfq5faoore6b1flkj4qq2/78554831537.pdf
    • http://curry-box-deluxe.de/userfiles/file/guritoxofojogo.pdf
    • http://mp-hd.de/data/aktualnosci_imgs/file/nutajafigek.pdf
    • http://sherwoodchambergolf.com/ckfinder/userfiles/files/94485683868.pdf
    • http://jyjjapan.jp/files/ckeditor/files/60858649316.pdf
    • https://profbuhotchet.ru/wp-content/plugins/super-forms/uploads/php/files/9c052f6bde9a1703485dc21d802acb17/8810721581.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=as+jonah+was+in+the+belly+of+the+fish
    • 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_off000237fa.bin
e87061539e7ac9d50dc184ad435c0e4e9ca4f88ba0d444e903fdca3c54f254cc
pdf-font-stream PDF embedded font (sfnt) at offset 0x237FA 29148 bytes
font_01_sfnt_off00027816.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x27816 16792 bytes
font_02_sfnt_off0002902d.bin
335f28cfe9db154af68367a394faa45be6ccdd43d0f5b94bb0cdd2bbffd0849a
pdf-font-stream PDF embedded font (sfnt) at offset 0x2902D 10660 bytes