Malicious PDF — malware analysis report

Static analysis result for SHA-256 22f9d891bd2e6a76…

MALICIOUS

PDF

86.3 KB Created: 2021-09-14 06:45:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: b02bfc43539bf20283f461c473c21063 SHA-1: cdffac219b8f90f0f3a189ee1ebd59f8011350ce SHA-256: 22f9d891bd2e6a7622f79488d896b77c0e28ddbcb490130ec7ae68e156407be4
196 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It contains a link farm pointing to various domains, some of which are associated with compromised CMS uploads. The document also includes a lure for password-protected archives, suggesting an attempt to bypass security controls and deliver a payload. The primary attack pattern involves directing users to potentially malicious external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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 http://archiw.bibliotekalesmierz.eu/img/upload/files/boxeri.pdf In PDF document text
    • http://sinocelltech.com/filespath/files/20210909204546.pdfIn PDF document text
    • http://www.mueblesgamez.com/ckfinder/userfiles/files/16470247983.pdfIn PDF document text
    • http://singer-island-condos.com/userfiles/files/29789981149.pdfIn PDF document text
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613043dfa00fd---89889856490.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fe3db62953---79973365840.pdfIn PDF document text
    • http://coquicart.com/ckeditor/ckfinder/core/connector/php/uploads/files/goxirorudilebugiwuri.pdfIn PDF document text
    • https://teplitsyoptom.ru/wp-content/plugins/super-forms/uploads/php/files/a870362ebe0c16db66dac6136304af35/basurubumaxupaxeg.pdfIn PDF document text
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/161369089c4d41---23700901592.pdfIn PDF document text
    • https://eternalbliss.net/file/2308562926.pdfIn PDF document text
    • http://jingmingtai.com/filespath/files/20210904100435.pdfIn PDF document text
    • http://jl-vacuum.com/upload/files/terokizidumajipilusuguwo.pdfIn PDF document text
    • https://hk-delight.com/UploadFiles/file/17667067343.pdfIn PDF document text
    • http://basketaci.cz/UserFiles/File/tunozomutaxazozexe.pdfIn PDF document text
    • http://mobilni-kadernictvi.cz/files/file/96898571873.pdfIn PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/16131479891acc---96902560872.pdfIn PDF document text
    • https://dichocungtoi.com/userfiles/file/timebinumopatim.pdfIn PDF document text
    • https://datatech-int.com/userfiles/file/tifiwosutaluj.pdfIn PDF document text
    • http://xn----ctbguteehkho5h.xn--p1ai/ckfinder/userfiles/files/49529443111.pdfIn PDF document text
    • https://n95america.com/wp-content/plugins/super-forms/uploads/php/files/bf14e8775781b3633b67d4fe74232b40/22137024921.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140149fe0076---xufidakusexebunamikigazu.pdfIn PDF document text
    • http://zgkimsteszew.pl/img/upload/files/25382795583.pdfIn PDF document text
    • http://badischer-kunstverein.de/ckfinder/userfiles/files/juputowunodokebafegesiz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=what+is+the+meaning+of+wipe+cache+partitionPDF 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_off0000ea24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA24 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010236.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10236 18068 bytes
SHA-256: ef20ff3624a1690b896049bfc3c2a5a5c124c486c77f1599efd99cabc7378e3f
font_02_sfnt_off000131ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131AD 10960 bytes
SHA-256: 6fee6215214fca62297161235bab747d331b1088acb711c67f9115f2ab9ccf86

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