Malicious PDF — malware analysis report

Static analysis result for SHA-256 23f0198d45c0ac88…

MALICIOUS

PDF

86.9 KB Created: 2021-10-07 20:32:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: d6cf674d7b14f033561082aca852960b SHA-1: 98ff74a3d889d37e13c166a40ca77127d92d6933 SHA-256: 23f0198d45c0ac88e5f72ec55b5ae94037cd7f93b9d1cbab2faa01240ccded9c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs that point to compromised WordPress sites and other disposable hosting, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest a phishing or trojan payload delivery. Although no scripts were explicitly extracted, the nature of the embedded URLs and the heuristic firings point towards an attack pattern involving redirection to malicious sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://catamma.ru/uplcv?utm_term=grant+and+emyle PDF link annotation
    • https://www.havanasalsa-dance-tours.com/wp-content/plugins/super-forms/uploads/php/files/f8afc551d325bc99021b497dbcca492d/fanelewupa.pdfIn PDF document text
    • https://cargotavio.ru/files/file/fedobalonade.pdfIn PDF document text
    • http://jdjcnc.com/upfolder/e/files/20210917211951.pdfIn PDF document text
    • https://inprovitcaribe.com/ckfinder/userfiles/files/88049276845.pdfIn PDF document text
    • http://jtylek.pl/Upload/file/8216765381.pdfIn PDF document text
    • http://www.jobsincrete.gr/images/_user_na/file/72247461165.pdfIn PDF document text
    • http://fastcredit.ge/userfiles/file/dutubivafogiwubojuv.pdfIn PDF document text
    • https://matricula.arendic.cl/files/lerixibugukasipak.pdfIn PDF document text
    • http://capital96.com/userfiles/file/nijomabipitekobitapiv.pdfIn PDF document text
    • https://sayurhijau.com/contents/files/17360561650.pdfIn PDF document text
    • https://costumeworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/16152863e1b927---munapodonetaramaladinekej.pdfIn PDF document text
    • https://maximaainfoways.com/WebExams/ckfinder/userfiles/images/files/fikigaxadowukifomiz.pdfIn PDF document text
    • https://kotypsy.pl/ckfinder/userfiles/files/11926905036.pdfIn PDF document text
    • http://banghetretruc.com/media/ftp/file/fimumalonubitifogelopavo.pdfIn PDF document text
    • http://giadinhmedia.com/uploads/files/18015338070.pdfIn PDF document text
    • https://podgoricki-klub.me/userfiles/file/vedojegipo.pdfIn PDF document text
    • http://www.hon-ro.hu/userfiles/files/23027463679.pdfIn PDF document text
    • http://velkoobchod-man.eu/ckfinder/userfiles/files/74948260178.pdfIn PDF document text
    • https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/351ef9436d31e420efec587b18e67787/59544901592.pdfIn PDF document text
    • http://pp-aqua.com/userfiles/files/fagosusavogusifad.pdfIn PDF document text
    • http://www.texaco.bargiel.com.pl/ckfinder/userfiles/files/33959671643.pdfIn PDF document text
    • http://naszemotyle.natura2000.pl/imgturysta/files/juwinipusaxuzurobuk.pdfIn PDF document text
    • http://grotech.in/userfiles/file/tofudipoxuriv.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_off0000ed78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED78 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001058a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1058A 19224 bytes
SHA-256: b2204f752a6cdc909be6f7c52536b7ce86fe7ef3f5ffa599a1ec4022dae85009
font_02_sfnt_off0001373e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1373E 10184 bytes
SHA-256: c79a4e197ed67b74220669ee817c777118fbccc9fa14cc1bffc846e8130e1bb2