Malicious PDF — malware analysis report

Static analysis result for SHA-256 1be37240f1ac2e1e…

MALICIOUS

PDF

80.0 KB Created: 2021-09-24 02:28:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: 24f9814cd14b12a6e82dd845987038b4 SHA-1: 9e9de69b968fa9a0342253d6c038ad685e6e1103 SHA-256: 1be37240f1ac2e1eda98d3f50259903dc4e2c1f99c383a0116584fdcfaccadeb
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 disposable hosting or compromised CMS upload directories, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. The presence of external URI heuristics and link farm indicators supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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 http://fapannimario.it/userfiles/files/52428866654.pdf In PDF document text
    • http://khyljg.com/uploadfiles/files/51315750244.pdfIn PDF document text
    • http://rosniyom.com/userfiles/files/95675820294.pdfIn PDF document text
    • http://eros-arena.name/eros/userfiles/file/2007877377.pdfIn PDF document text
    • https://certifiedmoversinc.com/wp-content/plugins/super-forms/uploads/php/files/ebc821837b59208be3fda9e7c6fff4f9/1739201715.pdfIn PDF document text
    • http://begemot-rus.com/uploadfiles/file/2021090305011373499.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/1614cfa5fe1de1---84218483169.pdfIn PDF document text
    • http://karat-dobremiasto.pl/userfiles/file/kesavafulipi.pdfIn PDF document text
    • http://professional-tuner.at/uploaded/file/xajuroronaxidibalukow.pdfIn PDF document text
    • http://khyljg.com/uploadfiles/files/gifunoxuwuju.pdfIn PDF document text
    • http://indemo.pl/Image/files/76496346987.pdfIn PDF document text
    • https://chokysitohang.com/Uploads/userfiles/files/28795950910.pdfIn PDF document text
    • http://stellarp.com/userfiles/files/pakewo.pdfIn PDF document text
    • http://www.dkmodels.net/ckfinder/userfiles/files/sebize.pdfIn PDF document text
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/422ba775c5072436a37309985a81dbaa/fonekodusewizagularaso.pdfIn PDF document text
    • https://matras-matrasych96.ru/admin/ckfinder/userfiles/files/48265532374.pdfIn PDF document text
    • http://bfcy88.com/uploads/files/barovozifuji.pdfIn PDF document text
    • http://dinhvi5s.com/images/newtech/files/570753404.pdfIn PDF document text
    • https://saikekanglun.com/filespath/files/20210909132935.pdfIn PDF document text
    • https://staffxrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/36420d2ac363450153c14f29ad4e75e5/42078607927.pdfIn PDF document text
    • https://lexcyberia.com/userfiles/files/71288133697.pdfIn PDF document text
    • http://iphysiology.ru/upload/11331074680.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140972580cca---pejenojuniluwivedokuzar.pdfIn PDF document text
    • https://thefertilizergranulators.com/d/files/83379571008.pdfIn PDF document text
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614c8eed33c2b---maruvaj.pdfIn PDF document text
    • https://brihat-group.com/assets/userfiles/files/87905719555.pdfIn PDF document text
    • http://kimwendelldesign.com/ckfinder/userfiles/files/gimufowexileno.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=sex+addon+for+minecraft+pePDF 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_off0000cdf1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDF1 19792 bytes
SHA-256: d66223939dabb7fa543739f828f5b4b559bdef75cca6e114a7788e9f9a83a377
font_01_sfnt_off000101c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101C1 10744 bytes
SHA-256: d95ffb2d3206143576e4af5468426ca3cb3605da1dbcfd3847ba80c6f5b0f917
font_02_sfnt_off00011a7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A7E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1