Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f679135ddb4d68a…

MALICIOUS

PDF

86.6 KB Created: 2021-06-29 13:11:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6c76e5f02adbbba70306560cda6e2431 SHA-1: 02fad839169113be014d4b0fad9a6f8d71d9427b SHA-256: 3f679135ddb4d68a274915869cdea447e2be3195107bda736749f1f9c986a5cf
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript and multiple external URIs, many of which are part of a link farm hosted on compromised CMS uploads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. The embedded JavaScript and link farm structure suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://www.mixedclass.com.au/wp-content/plugins/super-forms/uploads/php/files/pq9ar7rfeesn9revq2qimefm2p/87044829983.pdf
    • http://enotecagaribaldi.it/userfiles/files/futuvatusenuzutasopakito.pdf
    • https://www.kbstephens.com/wp-content/plugins/super-forms/uploads/php/files/edf95994d26833913decdff5985502b0/64906656727.pdf
    • http://stylist.in.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160b54f65cb611---wofidafesu.pdf
    • http://bpsstudio.hu/uploads/tuparudamax.pdf
    • http://eko-inwest.eu/upload/file/tobajevapekada.pdf
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607be8f17035e---niwavekonerabu.pdf
    • http://goodslib.com/userfiles/files/kuxowasapizusab.pdf
    • http://garageanything.com/js/upload/files/kesabowibigamavu.pdf
    • http://benedictinoselrosal.org/ckfinder/userfiles/files/luvarofufibewuwuwimapefa.pdf
    • https://daks-96.com/f/uploads/files/95398949097.pdf
    • http://africanhairbraidingsalon.com/userfiles/file/79754574544.pdf
    • https://alexandrapanayotou.com/web/images/static/file/kogaj.pdf
    • https://bistro-8.com/wp-content/plugins/super-forms/uploads/php/files/57abea119a994a521b89ed5f74a91c97/garefizuf.pdf
    • http://ahlhy.com/uploads/file/021528557448.pdf
    • https://srp-galabau-rostock.de/wp-content/plugins/super-forms/uploads/php/files/r6bmqv09tcf2hpeo28dghu5a3h/27776588272.pdf
    • http://dansensvenner.dk/imagesfile///wabizojanu.pdf
    • https://ivanda-commerce.hr/userfiles/file/35041586225.pdf
    • http://philippinesroadshow.com/wp-content/plugins/super-forms/uploads/php/files/1158bee480658a84d3ac168581021321/96248266243.pdf
    • http://zxpgw.com/userfiles/file/rovuzurasalivorodu.pdf
    • http://kozszemle.hu/uploads/files/vuganal.pdf
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/1609e6382e568c---22915400636.pdf
    • http://www.everhouse.lt/wp-content/plugins/formcraft/file-upload/server/content/files/160a92c206ed8c---dovuwizewawo.pdf
    • https://www.federatedlighting.com/wp-content/plugins/super-forms/uploads/php/files/f8ccbbeb3ed5910355d4f7889638629b/kesefudata.pdf
    • https://mangonebike.com/uploads/file/xujimoragidej.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=road+king+for+sale+near+me
    • 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_off0000ec01.bin
65bf3f123e21e2cdbd1731c52c3d2ed095ab63ef20656a5ffe110d8e6f327acb
pdf-font-stream PDF embedded font (sfnt) at offset 0xEC01 10736 bytes
font_01_sfnt_off0001046f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1046F 16792 bytes
font_02_sfnt_off00011c81.bin
0c9b0b2250cd78bfc224c706b1f6dce14e34d4e82337963547762e23bbe31546
pdf-font-stream PDF embedded font (sfnt) at offset 0x11C81 18808 bytes