Malicious PDF — malware analysis report

Static analysis result for SHA-256 8996d827a4a6d398…

MALICIOUS

PDF

83.9 KB Created: 2021-09-13 07:15:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: ebab936632cad46d9caffc8ce356064b SHA-1: a70b0f50beb5d7c019aefa28cbf6f1667eed9b4f SHA-256: 8996d827a4a6d398963d2f234170549ce8f850bdcc0b17dd7e47c3674b8881fc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious File

This PDF file was flagged by a machine learning classifier and ClamAV as malicious. It functions as a link farm, containing numerous URLs pointing to other PDF files hosted on various domains, many of which appear to be compromised or disposable. The presence of multiple 'link farm' heuristics indicates a deliberate attempt to distribute content through a network of interconnected links, a common tactic for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 http://artanuji.ge/admin/ckeditor/ckfinder/userfiles/files/21271043408.pdf In PDF document text
    • http://dragonera.cn/admin/userfiles/file/97365033251.pdfIn PDF document text
    • http://ttmplus.com/userfiles/files/rijuridagikidutekefe.pdfIn PDF document text
    • http://securitydirect.it/wp-content/plugins/super-forms/uploads/php/files/9594921394a02b946e4f02cbc2916e48/mapenibenefimi.pdfIn PDF document text
    • https://gulf-rope.com/images/bulk_images/files/pefugugujufexi.pdfIn PDF document text
    • http://ipost.mn/ckfinder/userfiles/files/80404923385.pdfIn PDF document text
    • http://cageart.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613ea11d204b7---jexefanufe.pdfIn PDF document text
    • http://benedictinoselrosal.org/ckfinder/userfiles/files/lozanuzolo.pdfIn PDF document text
    • https://beytarimcilik.com/admin/editor_resim/file/rusikerukisuketuzi.pdfIn PDF document text
    • http://sakuragiramenandsushi.com/uploads/files/xonusevanebulinux.pdfIn PDF document text
    • https://mepho.hu/ckfinder/userfiles/files/73272018837.pdfIn PDF document text
    • http://erictex.com/ufiles/files/badorejoruvarujis.pdfIn PDF document text
    • http://bbfederico2.net/userfiles/file/pipirakelu.pdfIn PDF document text
    • http://systemsbiology.at/uploads/assets/file/59242575846.pdfIn PDF document text
    • https://dimensionshoppe.com/alpha/ckfinder/userfiles/files/8433717597.pdfIn PDF document text
    • https://readxyz.org/wp-content/plugins/super-forms/uploads/php/files/7ad66f9e9acb49c441c9415f3ca3046f/kedupewiwasivusi.pdfIn PDF document text
    • http://nt-module.ru/ckfinder/userfiles/files/23625589137.pdfIn PDF document text
    • https://portecitadelle.portecitadelle.ca/ckfinder/userfiles/files/49394535081.pdfIn PDF document text
    • http://www.hausman.eu/images/wyswig_images/file/wosoxix.pdfIn PDF document text
    • http://donauwell.at/userfiles/file/74888104797.pdfIn PDF document text
    • https://chineseclothingonline.com/File/36080890675.pdfIn PDF document text
    • http://namhungholdings.com/uploads/ckfinder/files/16232036391.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=collective+noun+for+group+of+puppiesPDF 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_off0000e260.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE260 18056 bytes
SHA-256: f284138fca3823a81db3acfc0bf34e1225e34311cb7f8a4d8100906bbaa31005
font_01_sfnt_off000110fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110FD 10688 bytes
SHA-256: 63256038a2f7b9924bd68bb899aff22606ce5339738aca7f70ff2dfdc85f8366
font_02_sfnt_off000129ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129AD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1