Malicious PDF — malware analysis report

Static analysis result for SHA-256 8789ce6d595ba15a…

MALICIOUS

PDF

103.1 KB Created: 2021-09-02 11:57:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 2f1a1b923b1f973dfb6bc47dcc7b38d5 SHA-1: b01ea824d499b31b0dd5038286ba66aaab6269f4 SHA-256: 8789ce6d595ba15aa9a073afebe34d7725060e85299d643f6bce6367bddcf553
156 Risk Score

Malware Insights

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

The PDF file contains a link farm with numerous URLs pointing to various domains, many of which appear to be compromised or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a non-clustered link farm on disposable hosting, and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' highlights links to compromised WordPress upload storage. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or redirecting users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://landlorddebtadvisory.com/wp-content/plugins/super-forms/uploads/php/files/88kl5kqcqs2q0d1l4fmaoq3pt4/kigop.pdf In PDF document text
    • http://congtyvima.com/images/Download/guvazenonubozafiv.pdfIn PDF document text
    • http://frutapac.es/ckfinder/userfiles/files/59371183405.pdfIn PDF document text
    • http://ahchala.com/img/file/jegozupoxoxis.pdfIn PDF document text
    • https://psychotherapie-coeppicus.ch/userfiles/files/20553281157.pdfIn PDF document text
    • http://creativecoms.net/userfiles/file/90634819665.pdfIn PDF document text
    • http://hkt-optics.com/hkt/images/userfiles/file/xutanadupukogijed.pdfIn PDF document text
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091b5c2139e8---37554510061.pdfIn PDF document text
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/16123e0b508002---bukoju.pdfIn PDF document text
    • https://medsplus.us/admin/images/file/88891864313.pdfIn PDF document text
    • https://colakcivi.com/userfiles/file/dudozowijusojoximalo.pdfIn PDF document text
    • https://mariellatriolo.it/public/file/52362479436.pdfIn PDF document text
    • http://kemenyseprosiklos.hu/upload/file/joraruvino.pdfIn PDF document text
    • http://sunnysidehigh65.com/clients/d/d0/d00d1ad1640c45b888f5e58ac216a5d1/File/90380645750.pdfIn PDF document text
    • http://hungthanhauto.com/luutru/files/sajulukepuji.pdfIn PDF document text
    • http://bowlingkillers.com/imgdb/files/44417744839.pdfIn PDF document text
    • http://tamlaproject.com/userData/board/file/16079937030.pdfIn PDF document text
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1606f35baea36c---begajiwosawipuwaximijudif.pdfIn PDF document text
    • http://emke.hu/uploads/ckfinder/userfiles/files/mekesujoxole.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160c9d829c1c2f---voxeputuxoluveluni.pdfIn PDF document text
    • https://www.audioclinica.pt/wp-content/plugins/super-forms/uploads/php/files/f7p0hct75kkp9pjlkmtjokelp4/zibebatewiramirogogujaxu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=sieve+analysis+chart+pdfPDF link annotation
    • 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_off00012e97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E97 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000146a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x146A9 18260 bytes
SHA-256: 0de6274a817475f75bbf6c0f87d44092067c6bbc967644e909d46527e7c226b2
font_02_sfnt_off00017633.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17633 10852 bytes
SHA-256: f163c2757d361c8c1c75402014b9a671261de314eded23b5c4badec4ab25af2a

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