Malicious PDF — malware analysis report

Static analysis result for SHA-256 34693f13859a5244…

MALICIOUS

PDF

69.9 KB Created: 2021-09-13 00:55:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 342cf84612c5106dfb0d403a3a44f828 SHA-1: d106814a0041eb39a9df6b42c8d13b64adba836e SHA-256: 34693f13859a5244c375fb58267e4975eba5bfb59db16f10f33cff9ea887d76e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. The presence of multiple external URIs and a link farm heuristic points towards an attempt to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://chcial.ru/uplcv?utm_term=parking+master+download PDF link annotation
    • https://gizaviation.com/uploads/files/bojuxaxujo.pdfIn PDF document text
    • http://dxczx.com/ckfinder/userfiles/files/20210909_000728.pdfIn PDF document text
    • http://bagiez.de/userfiles/file/168658370.pdfIn PDF document text
    • https://onderhoudnlgarantie.nl/upload/file/62671252853.pdfIn PDF document text
    • http://zgkimsteszew.pl/img/upload/files/7113909854.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e6c56e050a---wenasiligisalaguzemawuse.pdfIn PDF document text
    • http://koovappadyscb.com/ckfinder/userfiles/files/pakud.pdfIn PDF document text
    • http://hulstcustoms.ru/uploads/files/wodijemari.pdfIn PDF document text
    • https://hoatuoi360.vn/uploads/files/71294418489.pdfIn PDF document text
    • https://truckforceone.eu/upload/editor/file/41118783394.pdfIn PDF document text
    • http://ramenhajimetustin.com/uploads/files/bepujudomokibuguvekize.pdfIn PDF document text
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134b19ee9155---21902691538.pdfIn PDF document text
    • http://kronikarp.pl/ckfinder/userfiles/files/kepabowisodesifaraf.pdfIn PDF document text
    • https://kochitaxirental.com/ckfinder/userfiles/files/63839803565.pdfIn PDF document text
    • http://lnshiyue.com/userfiles/file/20210910231517_844677129.pdfIn PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/1613e6f086df07---ponozununota.pdfIn PDF document text
    • http://namngonviet.vn/user-/files/rusaxakafojuzar.pdfIn PDF document text
    • http://studioagm.it/userfiles/files/40497746244.pdfIn PDF document text
    • https://www.sonorisation-auxerre.fr/ckfinder/userfiles/files/natozilopid.pdfIn PDF document text
    • http://jmyhship.com/uploadfile/files/wanokijobozakataxubaji.pdfIn PDF document text
    • http://www.truca-taoules.com/ckfinder/userfiles/files/71002742977.pdfIn PDF document text
    • https://avela.md/userfiles/file/19192158480.pdfIn PDF document text
    • http://shepardinteriordesign.com/rw/upload/file/bulotig.pdfIn PDF document text
    • http://polins.org/public/userfiles/file/95426580009.pdfIn PDF document text
    • http://toszegisuli.hu/userfiles/file/45961992128.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_off0000b309.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB309 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cb20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB20 10768 bytes
SHA-256: a4ade594795aad0b2028945ba77fc1223c223eed1dc228ca487280614d4d271c
font_02_sfnt_off0000e3be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3BE 15292 bytes
SHA-256: 988ad97b966e921de2bba33d013ccfbe389057ae9175253be5bc230fb51e8627

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