Malicious PDF — malware analysis report

Static analysis result for SHA-256 df9d31f564d0e6a4…

MALICIOUS

PDF

88.1 KB Created: 2021-06-27 07:23:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 980419c9c863b3b9690cc2bbb92c3be7 SHA-1: b813d424bb698df724954b5d2c3a528240eebeb2 SHA-256: df9d31f564d0e6a4f0373bb229e28484e8251992200bed37eabb684c7c6557e4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm pointing to multiple compromised WordPress sites, suggesting an attempt to distribute malicious content or lead users to phishing sites. While no scripts were explicitly extracted, the PDF structure and URL patterns are indicative of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://www.publicitymailing.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160ac3381b45d1---rawuno.pdf
    • http://rethabise.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16072aac24e745---tuligubiromuvosafuw.pdf
    • http://broadgatecapital.com/userfiles/file/16480131449.pdf
    • https://nowbali.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/16086003f3d996---92526299306.pdf
    • http://flomojapan.com/upload/files/kofawuviwu.pdf
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/tu65h1nbcluu6g36v2to18bu4a/neduwusewabikagezil.pdf
    • http://foodchemsino.com/d/files/26894776086.pdf
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070331a54c45---nisuxonitaxir.pdf
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba1ae9a6e8f---28454429308.pdf
    • http://effektfilm.de/files/file/23404196544.pdf
    • http://telekommarketing.com/firme_data/files/68526030346.pdf
    • http://bereanbaptistashton.com/clients/1/1c/1ca8668e480cca1e897b6add33210fc6/File/90354905960.pdf
    • https://xn--80aaa1anac6cg.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/26d21b8c6fe357f8793deefb28f89b90/gakamurawege.pdf
    • http://gd-weimi.com/upfolder/e/files/20210529170905.pdf
    • https://airshow-bg.com/file/kutelufemusu.pdf
    • https://www.rogierstoel.nl/wp-content/plugins/super-forms/uploads/php/files/g2rsqpm56m6lt0otki88mbrbgr/sakozafan.pdf
    • https://www.duffylighting.com/wp-content/plugins/super-forms/uploads/php/files/e8847e46389d9d6d99f28b9795396c44/14559510676.pdf
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/7f4b410f4gp3vi4a7te9812a49/fimenadukagebifize.pdf
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16077bf9b10600---pafevuzajopigakalurogo.pdf
    • https://lakeshoresmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/e042p0fkecl74o1iomeko1ers7/37428559878.pdf
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9802c54589---68157146342.pdf
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607dd394a77b9---wujoginejen.pdf
    • https://ajwatravel.com/wheelmarine/userfiles/file/24284799423.pdf
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609b179156a47---32024464500.pdf
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609f79ff6ca98---gudeferoxom.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=moment+of+inertia+about+y+axis+formula
    • 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_off0000f466.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF466 16792 bytes
font_01_sfnt_off00010c7d.bin
8b526cc4ba3e386d2983f9926c268d3e663701704e9c52900854b958014f4c18
pdf-font-stream PDF embedded font (sfnt) at offset 0x10C7D 10824 bytes
font_02_sfnt_off0001257b.bin
8354a59477d84ae3eece103ad83ca5c7350447e11a930ca7a04950b2faa0a40a
pdf-font-stream PDF embedded font (sfnt) at offset 0x1257B 17352 bytes