Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab9f1003578cabb1…

MALICIOUS

PDF

84.0 KB Created: 2021-09-09 14:37:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: ed051426083a09254793958639b1e5c9 SHA-1: 31529831f1cbae280032229a52e0a8dd471437b8 SHA-256: ab9f1003578cabb140c5a6c2a1e31a5787d6c78cbd6d2877df42f5f3703101b4
156 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to lure users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a phishing or downloader campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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=best+2020+apps+for+android PDF link annotation
    • https://ietc-oman.com/userfiles/files/11935738331.pdfIn PDF document text
    • http://itexpertdog.nwoasis.com/upload/files/13686063125.pdfIn PDF document text
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134eec045d04---21416043866.pdfIn PDF document text
    • http://lamekatus.com/uploads/ckeditor/files/demulifizes.pdfIn PDF document text
    • http://solarexperten.ch/fckeditor/editor/images/file/7415753827.pdfIn PDF document text
    • http://ooexperience.be/assets/Image/files/12014369150.pdfIn PDF document text
    • https://www.sensiblemachines.com/ckfinder/core/connector/php/files/59066934782.pdfIn PDF document text
    • https://ddriu.hu/wp-content/plugins/super-forms/uploads/php/files/d5c6d4d69a8c556a8f9c61efc46ecc51/notapubidodegosek.pdfIn PDF document text
    • https://rails-bg.com/fckeditorfiles/file/balamuvezuwasemoteg.pdfIn PDF document text
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613487b5e1ba4---nimulopitikakotupokug.pdfIn PDF document text
    • http://synowka.pl/galeria/file/xizosimebetarapuladilupuk.pdfIn PDF document text
    • http://madveras.com/ckfinder/userfiles/files/zeketulujumuvobipan.pdfIn PDF document text
    • http://stroyvodservice.ru/upload/File/49062676454.pdfIn PDF document text
    • http://seto.cz/uploads/kanomew.pdfIn PDF document text
    • http://mnogonomerov.ru/uploads/file/93122928175.pdfIn PDF document text
    • http://autovoda.ru/upload/files/89825314424.pdfIn PDF document text
    • https://gaadalagi.com/contents/files/dunen.pdfIn PDF document text
    • https://veglifekc.org/wp-content/plugins/super-forms/uploads/php/files/tixuxovopigogi.pdfIn PDF document text
    • http://imdad-egypt.com/userfiles/file/dilexolasigoverovub.pdfIn PDF document text
    • https://procogs.com/FCKeditor/file/37829546345.pdfIn PDF document text
    • http://nadiadsa.org/userfiles/file/13373760322.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_off0000e2f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2F5 18084 bytes
SHA-256: e6b4fd26585f14be0862feeec5ba35e471a29200d7b8782f4411c30241cfaebf
font_01_sfnt_off000111a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111A6 10740 bytes
SHA-256: 588af168da73559deba05c7f192f8421e2221f1c85728ca21c4f412d54690895
font_02_sfnt_off00012a8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A8D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1