Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a7d21dec52595f0…

MALICIOUS

PDF

81.6 KB Created: 2021-09-01 17:08:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 366b7911eafe1d2908f0f08545eece41 SHA-1: ac3a8f4af698fb3f39866e5b4b9b43bda907f8a9 SHA-256: 1a7d21dec52595f0812e9ea4b1994f92c92946c15ee16ba8cbda35adc4574717
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains a large number of external links, many pointing to compromised CMS uploads or disposable hosting, suggesting it functions as a link farm to distribute malicious content or conduct phishing attacks. The presence of numerous URLs indicates a broad attempt to lure users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://drafthe.ru/uplcv?utm_term=sexy+ghost+film PDF link annotation
    • http://ultrabeauty-ff.ru/userfiles/file/92250088394.pdfIn PDF document text
    • http://iberryhomemade.com/userfiles/files/57389617438.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a64f02562d3---zopidezexexafalogizivu.pdfIn PDF document text
    • https://xn--80aaaglcftt5alesfkk7f.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/1741c5a5cd6aeafbc16108480270324f/72940826976.pdfIn PDF document text
    • http://boxethai38.com/upload/file/51279542949.pdfIn PDF document text
    • http://oaklandscreche.ie/userfiles/files/bivolokimegebol.pdfIn PDF document text
    • https://bacninhonline.com/webroot/img/files/mubexi.pdfIn PDF document text
    • https://ccveg.org/wp-content/plugins/super-forms/uploads/php/files/qan2juj19i1ta46efp4crhuher/vidip.pdfIn PDF document text
    • http://hnc2.com/userfiles/file/54156436861.pdfIn PDF document text
    • https://raiporjai.com/piceditor/file/tepewodelojaloriboke.pdfIn PDF document text
    • https://voziky-paletove.cz/mctree.cz/pictures/other/files/7389335707.pdfIn PDF document text
    • http://flygarfield.net/userfiles/file/312862997.pdfIn PDF document text
    • http://witnesstherealist.com/wp-content/plugins/super-forms/uploads/php/files/59c0350e5afca6f758ed6ffe588c4ea0/63047636800.pdfIn PDF document text
    • http://associacaoguainumbi.org.br/wp/wp-content/plugins/formcraft/file-upload/server/content/files/16080c9af80ba3---belazi.pdfIn PDF document text
    • http://humanitool.ru/userfiles/file/42780489325.pdfIn PDF document text
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160755170a7819---28591218941.pdfIn PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/1608c0d37322b7---nopoponuxarofizimekitenut.pdfIn PDF document text
    • http://cbgnfinance.com/userfiles/file/kugesaxutalezosedusol.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_off0000dacf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDACF 17980 bytes
SHA-256: e0f79b70636f0b48140926ed0e700a8315b9cf9d275838eaf99a82573854ea75
font_01_sfnt_off00010982.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10982 10584 bytes
SHA-256: fd9f74dbaca087b8db97f0854d4711b0f53a0726f4d2f11f449bdcf58d669009
font_02_sfnt_off000121b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121B7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1