Malicious PDF — malware analysis report

Static analysis result for SHA-256 403f6fc96238758a…

MALICIOUS

PDF

71.5 KB Created: 2021-04-27 19:23:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 37f4c94b5ad5a0dc23cf1703d7e24640 SHA-1: 02e5967fd7e61f1892d27a5c1147b59b7bde6542 SHA-256: 403f6fc96238758aea9fcb2495cff1918fe6706b87244b40257ce82b2fc7360c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier with high confidence. It contains numerous links pointing to compromised WordPress upload directories, suggesting it functions as a link farm to distribute malicious content or phish users. The presence of external URIs and link farm heuristics indicates a deliberate attempt to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 http://projectbudapest.hu/wp-content/plugins/formcraft/file-upload/server/content/files/1607cce861db86---91316599873.pdf
    • http://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606da6d26ea22---62102182454.pdf
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/hehgnc3pkak80vo1qud1mg19na/xoperazadaj.pdf
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/43bb197425672b4b668ac2696a066a80/nubonutevexozezoxijiruzan.pdf
    • https://ecomassage.pt/wp-content/plugins/super-forms/uploads/php/files/5s9dmtvgcl3smd0crlbucbd6h4/29159299276.pdf
    • http://shmountaineering.co.uk/wp-content/plugins/super-forms/uploads/php/files/iekldib4oev85vrcvbfu88i3a2/wesanuki.pdf
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/1606f18062f6a3---vutixasideluz.pdf
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607e80d37e254---59933745188.pdf
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/cdc8e19f35f26a8bf47b9eb605024177/bixulapitudigax.pdf
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/v1qlbqh3b6u1golcr2u9sip3e5/15791496706.pdf
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16084bc55c2281---45714679261.pdf
    • https://globalclassic.org/wp-content/plugins/super-forms/uploads/php/files/2u28nrt5esm81pjg8ovcp0561f/50274063478.pdf
    • https://www.infrascale.com/wp-content/plugins/super-forms/uploads/php/files/d48600ee9483f1f35e288e0cc5681067/34277812779.pdf
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077b7d58dedb---vogoporetepufiserezuju.pdf
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/cd1lnuke3vldolsj0kj3cqp1p4/doforafikasinivozetijul.pdf
    • http://www.zopfitravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fae4fce391---62512661708.pdf
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/1607dc98311920---lepumen.pdf
    • http://elmiraclassiccountry.com/wp-content/plugins/super-forms/uploads/php/files/a39le2cm14gs266enf6ub76736/keluxejitisujaluguku.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=boron+form+cation+or+anion
    • 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://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dcfc.bin
7dfe8532e6c6b80f71860061f4130aea37c0b2eb2cc651d9ececd124b584ba42
pdf-font-stream PDF embedded font (sfnt) at offset 0xDCFC 4864 bytes
font_01_sfnt_off0000ed74.bin
a69c899cbdce2171ae477ffb38413a55c230a54af84a447eca3ecec1f2940c91
pdf-font-stream PDF embedded font (sfnt) at offset 0xED74 10400 bytes