Malicious PDF — malware analysis report

Static analysis result for SHA-256 011a4e71408d53bd…

MALICIOUS

PDF

82.6 KB Created: 2021-08-11 12:44:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: b8020b4f5d64787254d4d45f00667371 SHA-1: 627685b45dad64b699c85e22c925e6a66ce45819 SHA-256: 011a4e71408d53bdf27915defeca92f8e3e15dddee48eb100b9120aade864975
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ML classifiers and ClamAV, with critical heuristic firings indicating it's a phishing trojan. Embedded JavaScript and a link farm pointing to compromised WordPress upload directories suggest an attempt to lure users to malicious sites. The primary attack pattern involves using the PDF as an attachment in a spearphishing campaign to redirect victims to these compromised hosts.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160bd9be6c1b39---84529725505.pdf In PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c733009477---48651625685.pdfIn PDF document text
    • http://alexlunacoach.com/img/editor/file/16357749723.pdfIn PDF document text
    • https://at1-turbo-j3t.com/contents//files/ruxugedabulevomerinok.pdfIn PDF document text
    • http://www.mostenpo.jp/userfiles/files/67769969890.pdfIn PDF document text
    • http://deforma.it/userfiles/files/63072529454.pdfIn PDF document text
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606ee3c8684af---xeruzabakorufozipewudorof.pdfIn PDF document text
    • http://usagimatur.com/files/others/ritunufenuw.pdfIn PDF document text
    • http://douzonebnf.com/upload/file///totur.pdfIn PDF document text
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/07t25j9ud0ao31b6ruugfga891/47222918792.pdfIn PDF document text
    • https://dijitalsanat.link/upload/files/zasasaxazujazabe.pdfIn PDF document text
    • http://amadpich.com/userfiles/file/10298609168.pdfIn PDF document text
    • http://zaun-produzent.de/userfiles/file/19917565431.pdfIn PDF document text
    • https://californiaoptionsrealestate.com/wp-content/plugins/super-forms/uploads/php/files/e16faf82756fcfd6954b87d728b62b3c/50212887661.pdfIn PDF document text
    • http://homelife-superstars.com/image/files/41866581547.pdfIn PDF document text
    • https://rescue.bg/wp-content/plugins/formcraft/file-upload/server/content/files/160785846b9849---wuvipelegozolon.pdfIn PDF document text
    • https://expeditions-travel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ce4f02e416---555791074.pdfIn PDF document text
    • http://yuha.be/_files/file/tutasovolet.pdfIn PDF document text
    • https://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/5255e79bb8106d79606ae9179a69f5b9/ligasipexefo.pdfIn PDF document text
    • http://webcertain.net/contentupload/fckeditorUploads/organization_/file/wodep.pdfIn PDF document text
    • http://dspec-car.com/js/upload/files/tedizizegojagakesa.pdfIn PDF document text
    • https://299-45.com/CKEdit/upload/files/69429004749.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=atores+do+filme+o+curioso+caso+de+benjamin+buttonPDF link annotation
    • 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_off0000d70b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD70B 10988 bytes
SHA-256: e5d035d96d31a4040e2937442fca549c83bc4d182d1c1cfa6b2c88e8521838be
font_01_sfnt_off0000f08c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF08C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001089e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1089E 20180 bytes
SHA-256: 4ddf9be6be615916fdde4ddb2faf0cff3fdff0da390e515aa8c7e4ed18854fe7

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