Malicious PDF — malware analysis report

Static analysis result for SHA-256 dba00e99361e0db7…

MALICIOUS

PDF

76.6 KB Created: 2021-06-28 02:09:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 6a2e251da7f1484a2f075f884ca25940 SHA-1: bf9b27c58bca72a836e23b74b5685972c2e4cb9b SHA-256: dba00e99361e0db7b6c730349bf0809d6b85d9188f6bea785330c15d7c7c9465
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links pointing to compromised WordPress sites and disposable domains, indicating a link farm designed to redirect users to malicious content. ClamAV detection as 'Pdf.Phishing.Trojan' further supports its malicious nature. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://queure.ru/uplcv?utm_term=the+case+of+the+dubious+bridegroom PDF link annotation
    • https://ccveg.org/wp-content/plugins/super-forms/uploads/php/files/ocqu7eps5d1ov07md2q0e4jmvh/72753086853.pdfIn PDF document text
    • http://pnmanagementsolutions.in/uploads/54273156198.pdfIn PDF document text
    • https://markeishahall.com/wp-content/plugins/super-forms/uploads/php/files/2e35851ce55e4ee2c94f12fefffb45b2/57462187258.pdfIn PDF document text
    • https://www.endthestigmacounselling.com/wp-content/plugins/super-forms/uploads/php/files/k691sic3m28579ps5943l8ot5n/wosutoxasumewogewo.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/16085fbe2c40f0---46790140623.pdfIn PDF document text
    • http://optimus.org.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c77fab85ebd---dodosafubog.pdfIn PDF document text
    • http://beiwendq.com//data/attachment/file/rigugogelolamememetevo.pdfIn PDF document text
    • https://cwlighting.com/wp-content/plugins/super-forms/uploads/php/files/20f0f4a7665d06c3a2f3ed439bbebe25/sujofu.pdfIn PDF document text
    • https://www.dynasil.com/wp-content/plugins/super-forms/uploads/php/files/ae27a9112ec2c2bdb7a787539ab7caab/lalurogowuxasoviraz.pdfIn PDF document text
    • https://vdbergelectro.nl/wp-content/plugins/super-forms/uploads/php/files/0082987c7ab7897563c60bb8047e79b4/pubabeziwuva.pdfIn PDF document text
    • https://myupfield.link/wp-content/plugins/super-forms/uploads/php/files/dd4pok3ve1ua4ki5c834pqoph0/56317883225.pdfIn PDF document text
    • http://thanhlapcongtykiengiang.com/upload/ck/files/pigoniworelune.pdfIn PDF document text
    • https://deconkhoemanh.com/wp-content/plugins/super-forms/uploads/php/files/og2spu3iuk0s4ipl9344sq4vsa/46992293248.pdfIn PDF document text
    • https://blogsma.com/files/nufofotutuv.pdfIn PDF document text
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc4f0e16313---72187838080.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aed7ecd0055---99856183027.pdfIn PDF document text
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/a482925da1aee56bda93427c6fb5b702/manilugodasewejige.pdfIn PDF document text
    • https://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086ab529ac24---55624245473.pdfIn PDF document text
    • https://esperanzadeavila.com/fotos/file/natumuser.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098e732205f0---52293277230.pdfIn PDF document text
    • http://herodumpsterrental.com/wp-content/plugins/super-forms/uploads/php/files/4e61cd40f60a62653747c9cee718f49e/domim.pdfIn PDF document text
    • https://apoc.com.au/wp-content/plugins/super-forms/uploads/php/files/6c92bb417f62ba53016667083069524f/68425419041.pdfIn PDF document text
    • https://deedpoll.sg/wp-content/plugins/super-forms/uploads/php/files/eb0b8ac76de8dd0892a324198a54a685/79237525899.pdfIn PDF document text
    • https://samarpanbharat.org/trila/userfiles/file/bemaz.pdfIn PDF document text
    • https://christembassyromford.org/wp-content/plugins/super-forms/uploads/php/files/7b8ad60f9259b9711b325b5c5c97d123/28390761248.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/1os31fc20cs1kgb1tho66kl7n1/92491605140.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c719.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC719 17140 bytes
SHA-256: 67e07096710409d1d96ecfdec5f13421bb435f7631a89684d869c312db2adf00
font_01_sfnt_off0000f397.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF397 10976 bytes
SHA-256: a4b83400e93f7f947f8f657969983a7d48e1bb07f63f00a821ca1e8be773065f
font_02_sfnt_off00010ceb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CEB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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