Malicious PDF — malware analysis report

Static analysis result for SHA-256 c0f9823dc412334f…

MALICIOUS

PDF

92.9 KB Created: 2021-07-17 21:50:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b3c638595f213bde11678b7f21535d6b SHA-1: 2fc2f7264b72730d8861ca09e4ae4ab36b4556e8 SHA-256: c0f9823dc412334fe6dc9e00c4633ae403ad9cef5fe3c64e012505205697dd52
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed to distribute malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

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://cestovni-postylka.eu/userfiles/file/makeximevuwuziligomosik.pdf
    • http://gangwonbnb.com/FileData/ckfinder/files/20210714_980DEC6D25AE7D59.pdf
    • http://global-leasing-management.com/uf/file/tezemufo.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608828c5ef359---kitagijalufiwo.pdf
    • https://www.reflectionuk.com/wp-content/plugins/super-forms/uploads/php/files/f338cm3ghcfadojpme9eq5ujrm/25048213011.pdf
    • https://ivaco.it/file/nenesezokusitiguteduvela.pdf
    • http://www.socalgreatwhite.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2df629d825---sulavamofijososagokux.pdf
    • https://motelandratecuci.ro/userfiles/file/76881022869.pdf
    • http://musorcentrum.hu/files/article/file/belaxiwapojorakaguge.pdf
    • http://pension-erlkoenig.de/img/editor/file/93929541861.pdf
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608180ef6994b---vifopu.pdf
    • http://rld-carbon.ru/file/17850267797.pdf
    • https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/7212986b5f323bb1c436c788f1f2f1b0/31583444684.pdf
    • http://math-talk.kr/wp-content/plugins/super-forms/uploads/php/files/ana27vkqc8j3eu36nml53a6j77/88139217009.pdf
    • https://study-go.info/wp-content/plugins/super-forms/uploads/php/files/0b14577c69ea5d74ee6af5f76c42a4a0/69245538986.pdf
    • http://grupomarsamo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ada41a45c9---bepujojibaditogazolit.pdf
    • https://beribuket.ru/wp-content/plugins/super-forms/uploads/php/files/1b4640d73778eb9005a34824605f2f5a/18485159583.pdf
    • https://turismopontevedra.com/ckfinder/userfiles/files/sekakaxuwibopuxeki.pdf
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/160d918d73b795---bodomirozimovatutiv.pdf
    • https://suemsas.com/wp-content/plugins/super-forms/uploads/php/files/3i7vbkn00v0q1k4jpcm9gjvhi7/midavuwa.pdf
    • https://rittenhousesmiles.com/wp-content/plugins/super-forms/uploads/php/files/5e8b3e1c29fbc8bcd0938790da6a1734/9445331988.pdf
    • https://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/94d731198cc4dc906f2a598bf2d74369/86440858622.pdf
    • http://bahtiyardishekimi.com/fckfiles/file/24775534565.pdf
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/b99f473bb4d8f2eab92a79a9ef12eeb4/waludawaxigakawozakaku.pdf
    • http://gpmpoolandspa.com/ckfinder/userfiles/files/goxurukesaliw.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=sql+server+multiple+choice+questions+and+answers
    • 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_off00010835.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10835 16792 bytes
font_01_sfnt_off00012047.bin
bb6869c0d1d03d4dff1ecbc590124f1aa7afc192b40a4fcc1a8b4f97783576aa
pdf-font-stream PDF embedded font (sfnt) at offset 0x12047 16748 bytes
font_02_sfnt_off00014bd7.bin
dd8f6a661ff9a1e3efa56f78572e5aee6387d3a678fd008606df912acd23042f
pdf-font-stream PDF embedded font (sfnt) at offset 0x14BD7 11252 bytes