Malicious PDF — malware analysis report

Static analysis result for SHA-256 1ad085ef4e42bf30…

MALICIOUS

PDF

71.8 KB Created: 2021-09-02 23:24:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 43f3c7496f16bed7612ae6b7577849c2 SHA-1: da23fb24c705b46bae4077e6f305d6f100ecb673 SHA-256: 1ad085ef4e42bf300ff637df196e76e55dd04b04239a3b88fa12e40b8e65675d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF containing numerous links to external resources, many of which point to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically identified as phishing or a trojan. The presence of multiple links to potentially malicious PDF files suggests a campaign to distribute further malware or conduct phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://moniimpex.com/wp-content/plugins/formcraft/file-upload/server/content/files/160895a3648cdc---bevarofu.pdf
    • http://auxerretv.com/content/public/file/gazamaginexegemu.pdf
    • http://fw-simple.com/uploads/files/63392029734.pdf
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0f99371c2b---60790960957.pdf
    • http://ajarnveerapong.com/UserFiles/file/kirimurepiromagilugimetod.pdf
    • http://mottaing.eu/userfiles/files/tesuwirevik.pdf
    • http://areawifi.com/DESARROLLO/userfiles/files/80100949416.pdf
    • http://vandientuchinhhang.com/upload/files/90243285980.pdf
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608093a8b5e2d---1221613862.pdf
    • http://pn-tech.net/userData/board/file/falira.pdf
    • https://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/db92a3c76f271049a5339adb4e8aebfd/30799289308.pdf
    • https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/72469dc28ab6e977be67c7de112986b2/gegamanavemokebuwobixoso.pdf
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/160b61d9f9f2b1---53586765453.pdf
    • http://www.megasaludips.com/wp-content/plugins/formcraft/file-upload/server/content/files/160de2aa128d97---54725254717.pdf
    • https://lecourbe.dk/userfiles/file/84713022379.pdf
    • http://matkinhantai.com/luutru/files/13093719176.pdf
    • https://www.emma-solutions.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a37a2173757---libefufusozuguviguwajev.pdf
    • http://nct-vn.com/userfiles/file/farof.pdf
    • https://askisan.com/upload/ckfinder/files/59323777372.pdf
    • https://tramhuonghanoi.vn/upload/files/fekagabemadolawegizulirow.pdf
    • http://laros.cz/UserFiles/file/37770284611.pdf
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16087f53e164bb---35977422174.pdf
    • https://desertflying.club/wp-content/plugins/formcraft/file-upload/server/content/files/1611a39301b350---munofomedomerulepupidefiv.pdf
    • https://www.freshstartdigitalmarketing.com/wp-content/plugins/super-forms/uploads/php/files/6eb45d29ccdba3f5aabb0f66e1e3d2dc/64934673410.pdf
    • http://tiszaikaland.hu/upload/file/93694088674.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=lord+of+the+flies+full+pdf+download
    • 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_off0000ba79.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xBA79 16792 bytes
font_01_sfnt_off0000d290.bin
3431de2c2a76b38691c480e8da03af860d1492c158470f54579ce250f54fa783
pdf-font-stream PDF embedded font (sfnt) at offset 0xD290 10740 bytes
font_02_sfnt_off0000eb35.bin
2850cc22f0ff131000aa02c1da712f528e56c8f210f82744c1d01a652ebfe338
pdf-font-stream PDF embedded font (sfnt) at offset 0xEB35 15028 bytes