Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b22e9088aee8605…

MALICIOUS

PDF

86.6 KB Created: 2021-08-04 23:43:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: d22e467c865345f9a26db4df50523fd6 SHA-1: ce76ea66c0b06d601fbf96716e799e3c5b99da25 SHA-256: 7b22e9088aee86056f0120a261434b46a6cd477d1c0130e0c5d629695aa835eb
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 various external URLs, some of which are hosted on compromised WordPress sites. The presence of a visual download button further supports a phishing or malware delivery attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://medvor.ru/uplcv?utm_term=is+logitech+c920+webcam+compatible+with+windows+10 PDF link annotation
    • http://fittbike.hu/files/file/11261180443.pdfIn PDF document text
    • http://juicewarenhuis.nl/app/webroot/files/userfiles/files/teneguxijesebogit.pdfIn PDF document text
    • https://viettincapital.vn/upload/files/11598726895.pdfIn PDF document text
    • http://mygiftltd.com/userfiles/file/58302434287.pdfIn PDF document text
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075cf43195b6---retididesiza.pdfIn PDF document text
    • http://prmakeup.com/Image/files/72363411975.pdfIn PDF document text
    • http://turagent007.ru/userfiles/file/16259866034.pdfIn PDF document text
    • http://grubstreet.ca/ckfinder/userfiles/files/96712348075.pdfIn PDF document text
    • https://cvenhancer.com/wp-content/plugins/super-forms/uploads/php/files/9dee4d2f434f2e6f03b19f6b3b90a9da/33560620439.pdfIn PDF document text
    • http://polkovnik.su/upload/file/22983422625.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa5cb7d4171---10992612007.pdfIn PDF document text
    • https://homini.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16084d385be918---tenaparimebogexop.pdfIn PDF document text
    • https://sieuviet.net/webroot/img/files/tudobukokufitifajetixus.pdfIn PDF document text
    • https://ecohort.com/userfiles/files/60720872958.pdfIn PDF document text
    • https://bawaniint.com/ckfinder/userfiles/files/60613282158.pdfIn PDF document text
    • http://francescasciortino.it/userfiles/files/13863308187.pdfIn PDF document text
    • http://aucoindeshalles.com/menu/file/dubuginavokowebefa.pdfIn PDF document text
    • http://profisystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16079feecbd928---20614932971.pdfIn PDF document text
    • https://alshamiltrading.com/alshamilfiles/file/1232324803.pdfIn PDF document text
    • https://galedo.cz/www/data/cms_files/files/83853783164.pdfIn PDF document text
    • http://www.anjhimayath.com/upload/file/94857807328.pdfIn PDF document text
    • https://tecnibat.net/uploads/archivos/50375226129.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_off0000e9d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9D8 11500 bytes
SHA-256: 2f0e61381fa42a9b4fbfa71be92ec073252b2a38eebfac68ec203c2f2a352550
font_01_sfnt_off0001049a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1049A 18036 bytes
SHA-256: ea117a186ddf5dd8fa4f8e4c5a0ea54755d783cf5d6b4d643d78ba38a93c6c43
font_02_sfnt_off00013491.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13491 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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