Malicious PDF — malware analysis report

Static analysis result for SHA-256 d31913cffa7fd9db…

MALICIOUS

PDF

84.9 KB Created: 2021-07-13 08:47:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 51b739a86d54182c883850514b29489f SHA-1: e4bb83c95d1e825fa5de402cb6754208a36888b5 SHA-256: d31913cffa7fd9dbc2a36044ae7a5559e8848e05ad70896f96507f23c7f05301
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple compromised websites and disposable hosting domains. While no scripts were explicitly extracted, the nature of PDF exploits often involves embedded JavaScript to facilitate redirection or payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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://laborke.ru/uplcv?utm_term=no+layers+match+the+filter+photoshop PDF link annotation
    • http://barsugo.com/ckfinder/userfiles/files/55586630729.pdfIn PDF document text
    • http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e8e8faa5383---suzapilakurikovamomege.pdfIn PDF document text
    • https://najarshi.com/basefile/najarshicom/files/fupixegekaxajemufizuz.pdfIn PDF document text
    • http://carszana.com/image/upload/File/nikinigafiw.pdfIn PDF document text
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1609b3dc66f0ba---gofajodasivejelije.pdfIn PDF document text
    • http://1975geegees.com/clients/78603/File/fupofisebok.pdfIn PDF document text
    • https://cgeminfos.ma/upload/file/fejodazagimaxunotiweg.pdfIn PDF document text
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dfc8c3b4676---19145271182.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160759c0cc63b3---dizomolo.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608845d321d46---lixopizodiwewavovaw.pdfIn PDF document text
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608c97e3c842f---38336286022.pdfIn PDF document text
    • https://traveltokiev.com/wp-content/plugins/super-forms/uploads/php/files/ufjmj3n93blmgni3bjfg8phq45/79168455909.pdfIn PDF document text
    • http://xn--e1aazeoc7d.xn--p1ai/images/shared/file/baruzolatejofapozedino.pdfIn PDF document text
    • http://boekenwinkelindex.nl/images/uploads/11117173024.pdfIn PDF document text
    • https://bataretak.com/img/files/file/laxamorutuvejotowo.pdfIn PDF document text
    • http://quocteanviet.com/img-chamthi/files/30738986547.pdfIn PDF document text
    • https://www.reachcast.ca/wp-content/plugins/super-forms/uploads/php/files/d4770433605505f1b4f172d5ccc11ba4/48685203710.pdfIn PDF document text
    • https://cjsc.se/ckfinder/userfiles/files/24903196.pdfIn PDF document text
    • https://vresponse.net/userfiles/file/rozoz.pdfIn PDF document text
    • https://299-45.com/CKEdit/upload/files/wikedefa.pdfIn PDF document text
    • https://paidionresearch.com/userfiles/files/sakem.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_off0000e8f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8F7 10732 bytes
SHA-256: 9bd2f459d50a79681e99ffdc92be341b9e1ea3d33bf45c5d7560741921a9254e
font_01_sfnt_off000101ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101AB 17160 bytes
SHA-256: b75edaa77821b3ffcc3113df2c162312d959271a3d8ea608f5a3df086c1fd3a4
font_02_sfnt_off00012e91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E91 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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