Malicious PDF — malware analysis report

Static analysis result for SHA-256 98c8efc2e58839d3…

MALICIOUS

PDF

73.9 KB Created: 2021-09-17 22:02:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 580553363a311f573e9b9646ade37891 SHA-1: 3218caa2b8fdfaa8a540cdc3319480b8c6b362d5 SHA-256: 98c8efc2e58839d3f9c7c9fb41f6ffb175680b646328726b3a97731e2d9a48af
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and a large number of external URIs, many of which point to compromised CMS uploads or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript likely facilitates the redirection to these malicious URLs, which are designed to deceive users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://wastran.ru/uplcv?utm_term=how+to+create+shortcut+on+android PDF link annotation
    • https://speakingparrot.com/upload/ckfinder/files/bixuvefizasuvusez.pdfIn PDF document text
    • http://architettoannalisatinelli.it/userfiles/files/66486224108.pdfIn PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/161310e45af4e4---mobaxaminotijakidegu.pdfIn PDF document text
    • http://huarui-bio.com/upload/files/68255598457.pdfIn PDF document text
    • http://interroadholland.nl/userfiles/file/jakonolugegawuzevo.pdfIn PDF document text
    • http://langfordfinancialservices.com/userfiles/files/zivekebawol.pdfIn PDF document text
    • https://italvaping.com/file/nanomixawabodo.pdfIn PDF document text
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/c39f54a2dedec23009b63303cdcb87ff/65376577103.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f547102f05---rufazefiwebovusivusofuge.pdfIn PDF document text
    • http://xn--80aafbjcazdrhzgiddbbcsg4l.xn--p1ai/pict/file/voravodema.pdfIn PDF document text
    • https://plewmal-d.com/Uploads/files/fajagujobonunenewititu.pdfIn PDF document text
    • http://railwaysrailroads.com/upload_files/files/41634310967.pdfIn PDF document text
    • http://synphabase.ch/upload/file/52437352795.pdfIn PDF document text
    • http://garageanything.com/js/upload/files/33207774185.pdfIn PDF document text
    • https://www.confirmedtour.com/files/zitexawepilivetuk.pdfIn PDF document text
    • http://prodottoitalia.eu/userfiles/files/weken.pdfIn PDF document text
    • https://hylyt.co/wp-content/plugins/super-forms/uploads/php/files/a6fdec21766feacd669ee16387bc9375/48479117196.pdfIn PDF document text
    • https://nslogisticservice.com/userfiles/files/kifavonobek.pdfIn PDF document text
    • https://e-motorcycle.tw/upload/emotorcycle/files/sibuwe.pdfIn PDF document text
    • http://zoncmswebsitebeheer.nl/files/editor/file/75755384909.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_off0000bf61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF61 16376 bytes
SHA-256: 69b2be4f936d1cbbd428c104175582c2085a01f4bf80f50c732441b5d7d21451
font_01_sfnt_off0000e9b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9B2 10600 bytes
SHA-256: c5babf9873297162164a29614a996f6a182a4db4d16b35bdf8c6e95827cda3fa
font_02_sfnt_off000101db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101DB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1