Malicious PDF — malware analysis report

Static analysis result for SHA-256 511da36168226d9b…

MALICIOUS

PDF

80.8 KB Created: 2021-09-16 06:54:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 583118063fff0f0dcc6637353aac4952 SHA-1: a0f7fb5931ccfead676b6a4d64e9cb0e958781f8 SHA-256: 511da36168226d9bb2c6cef21ce1f6dacf9d9d0f7ac736a87c2efd1d0d5f11e9
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and link farms, with several pointing to compromised WordPress upload storage and disposable hosting. The presence of embedded JavaScript, combined with the link farm heuristic, suggests the document is designed to redirect users to malicious sites, likely for phishing or malware distribution. ClamAV detection further supports its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9933

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://drafthe.ru/uplcv?utm_term=epoch+2+apk PDF link annotation
    • https://lombardpruszkow.pl/local/userfiles/file/95494047290.pdfIn PDF document text
    • http://votava2.altrodesign.eu/ckfinder/userfiles/files/konejizutekeganogu.pdfIn PDF document text
    • http://remont-etalon.ru/upload/files/paxizigodasinikib.pdfIn PDF document text
    • http://dealershop.es/camarasegovia/userfiles/file/jokipoxoz.pdfIn PDF document text
    • http://vstarmp.cn/upload/files/20210911_092857.pdfIn PDF document text
    • http://oldadmin.k12cart.com/media/files/revupuzodude.pdfIn PDF document text
    • http://sangiorgioautoservizi.com/userfiles/files/sususaxisilane.pdfIn PDF document text
    • http://tg-focus.ru/userfiles/files/49094775169.pdfIn PDF document text
    • http://biomax.shop/filespath/files/20210903065036.pdfIn PDF document text
    • http://kronospan-mofa.hu/editor_up/2792836003.pdfIn PDF document text
    • https://allegypttours.net/userfiles/files/bedunuximoxezasuj.pdfIn PDF document text
    • https://goactive.hu/wp-content/plugins/super-forms/uploads/php/files/644eab2a737f823d4b36d7bd416fe4ab/16581079541.pdfIn PDF document text
    • http://daehnfeldt.com/userfiles/file/guluvibaguwabegekokavugow.pdfIn PDF document text
    • http://familiegravesen.dk/ckfinder/userfiles/files/62347390203.pdfIn PDF document text
    • http://nyitotthaz.hu/userfiles/files/69137962357.pdfIn PDF document text
    • http://dzirerealtors.com/uploads/pisuxosejipaxiripipejus.pdfIn PDF document text
    • http://cetis156.neutronds.com/assets/js/ckfinder/userfiles/files/ralanomow.pdfIn PDF document text
    • http://sirinthepgroup.com/userfiles/file/kenufazakimagujawubo.pdfIn PDF document text
    • http://oldmotorsclub.com/files/file/sebev.pdfIn PDF document text
    • https://www.singaporemedicalclinic.com/ckfinder/userfiles/files/97178003102.pdfIn PDF document text
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c2c1590fe6---jesusowufepimisafodesaju.pdfIn PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613277c664b8f---pojesapejoruwanujewejo.pdfIn PDF document text
    • http://gelikonline.ru/content/Files/1043566218.pdfIn PDF document text
    • http://nanchang.chinatupai.com/web/js/ckfinder/userfiles/files/nerevirapematixikepev.pdfIn PDF document text
    • https://vwb.mrv-educationservices.com/content_file/files/morivezusododejejogusego.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c17f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC17F 16124 bytes
SHA-256: 2c21ff3ceeb7a5749d3d52712a08aca31fcce6c6a030d08a19a294d8f4050a43
font_01_sfnt_off0000d6ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6EA 9928 bytes
SHA-256: a3db6998b9d2a39fd0ac7ed33964d48203e2cfd10b4b0c56e81254a99af90ca3
font_02_sfnt_off0000ed05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED05 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00010517.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10517 18596 bytes
SHA-256: d011fa9b113d8966ac8afb7d568f7cb44524ad18b38fe80613717ce8ec39fdf9

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