Malicious PDF — malware analysis report

Static analysis result for SHA-256 a20537d78b00dc58…

MALICIOUS

PDF

85.2 KB Created: 2021-09-18 23:57:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 29c6bb27d623397357a6804870dc03fc SHA-1: 16c400e10fc4b093ff3b028a3c6b04eeb9e6578c SHA-256: a20537d78b00dc583eac813788939275d1bf4f9f95c80578b65643e5b4223696
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The document body is heavily obfuscated and unreadable, providing no direct clues to its purpose beyond the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://crysiq.ru/uplcv?utm_term=mxq+pro+4k+display+settings PDF link annotation
    • http://neoneophytou.com/ckfinder/userfiles/files/92751436865.pdfIn PDF document text
    • https://valleyrentals.com/userfiles/file/90874303759.pdfIn PDF document text
    • http://johnmichaelharrisonlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/78865359527.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/161424007a4721---pakugazezomufobodipejipo.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/f863f1f2895a978f1abee8d2387c05e8/53365282323.pdfIn PDF document text
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141ad61616d2---46155105624.pdfIn PDF document text
    • http://precisao.net/files/files/78479874571.pdfIn PDF document text
    • http://xn--9w3b270a7kf.kr/data/editor/file/gegola.pdfIn PDF document text
    • http://www.portaldasfreguesias.com/portugal/vianadocastelo/vianadocastelo/geraz_do_lima_sta_maria/ckeditor/ckfinder/file/vemebetekugibukuwo.pdfIn PDF document text
    • https://cortemadera.com/wysiwygfiles/file/gisidokobamigomowad.pdfIn PDF document text
    • http://virus-safe-zone.com/ckupload/files/ramefowezar.pdfIn PDF document text
    • https://mariellatriolo.it/public/file/depokigulugajat.pdfIn PDF document text
    • http://rassadaspb.com/new/files/file/66849066430.pdfIn PDF document text
    • http://www.anglometais.com.br/adm/Editor/ckfinder/userfiles/files/43398419118.pdfIn PDF document text
    • http://architettotamborra.eu/userfiles/files/mafakajipulidobak.pdfIn PDF document text
    • https://www.eecpowerindia.com/codelibrary/ckeditor/ckfinder/userfiles/files/wavenavopopetagutasotukur.pdfIn PDF document text
    • http://sochi-vitrazhi.ru/ckfinder/userfiles/files/gakunijiru.pdfIn PDF document text
    • http://drukarnia-skawina.pl/app/webroot/media/files/55483874395.pdfIn PDF document text
    • https://olivierdaulte.com/ckfinder/userfiles/files/duzibimusovifefejatapuzu.pdfIn PDF document text
    • https://wyslijpaczki.pl/app/webroot/files/userfiles/file/sisibawov.pdfIn PDF document text
    • http://fobas.cz/userfiles/file/38666047869.pdfIn PDF document text
    • https://tidymoney.com/ckfinder/userfiles/files/jodalafi.pdfIn PDF document text
    • http://museodegliarazzimarsala.com/userfiles/files/zusuwimaluxikevedukadux.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_off0000e662.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE662 18024 bytes
SHA-256: c387999ebf8474f761275101ddb060427331875068c8c1ef50ab8f052562471a
font_01_sfnt_off00011547.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11547 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012d5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D5E 11092 bytes
SHA-256: 654cbb4d2887a12843ebba85eeaefd42785871c4e5fe593880453be5b818bc93

Open this report in the interactive analyzer, or submit your own file for analysis.