Malicious PDF — malware analysis report

Static analysis result for SHA-256 f7c95ad639876af7…

MALICIOUS

PDF

69.4 KB Created: 2021-09-15 16:09:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 4bfc4e0dd3db880d23b7eb274228728c SHA-1: eb8be56b6eaf145aead659d58bc6a4fea014abcc SHA-256: f7c95ad639876af71ad5811e65ebf41b92b65cfb936f12262ce743b0ea279ed4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, with numerous embedded URLs pointing to potentially compromised websites or disposable hosting. These links are likely intended to lead users to phishing sites or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 https://smidgel.ru/uplcv?utm_term=android+personal+emoji PDF link annotation
    • https://dongciao.com/uploads/files/202109150459545022.pdfIn PDF document text
    • https://stpetejazz.com/wp-content/plugins/super-forms/uploads/php/files/pqsrnkhk59j6lqghnalbtchmh5/wabojexubabokotiresojosap.pdfIn PDF document text
    • http://ediljolli.com/userfiles/files/88992003348.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613aa073c47f4---misovox.pdfIn PDF document text
    • http://air-con.ru/upload/files/bemisax.pdfIn PDF document text
    • https://pustelnik-budownictwo.pl/ckfinder/userfiles/files/rosefovudekaguluzat.pdfIn PDF document text
    • https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/b834d4d631da7e93c1bc640c0c21ccef/72680935818.pdfIn PDF document text
    • https://bvphcn.bdata.vn/upload/files/gogogof.pdfIn PDF document text
    • http://bergfin.se/wp-content/plugins/formcraft/file-upload/server/content/files/1612f279e1eebc---71797156853.pdfIn PDF document text
    • https://www.havanasalsa-dance-tours.com/wp-content/plugins/super-forms/uploads/php/files/ce9a151d4ce70967dbbd8b3c1790faf0/lomemodebigabeladubegofa.pdfIn PDF document text
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/1706879ccb55bb8802cbd9c993bc2cd7/22277028949.pdfIn PDF document text
    • https://sunwayhk.com/louis/STARKGROUP/ckfinder/userfiles/files/28617965815.pdfIn PDF document text
    • https://gad-elhak.com/userfiles/file/15293072115.pdfIn PDF document text
    • http://kozelskadm.ru/files/uploads/files/disigutiwojifamuzefofumo.pdfIn PDF document text
    • http://jungvassar.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/bapukegipi.pdfIn PDF document text
    • http://harckocsik.hu/userfiles/file/63583980673.pdfIn PDF document text
    • http://sky1981.com/asset/uploads/files/zoxenelobudivoludupezif.pdfIn PDF document text
    • http://kcemsp.org/upload/editor/file/40551478247.pdfIn PDF document text
    • http://rebizplus.com/userfiles/file/wated.pdfIn PDF document text
    • http://rcp-ranstadt.us/files/taluzo.pdfIn PDF document text
    • https://mariapolis.net/ckfinder/userfiles/files/33990411314.pdfIn PDF document text
    • http://aiaato.com/FileData/ckfinder/files/20210911_41F141AA4B285810.pdfIn PDF document text
    • https://horgaszvelem.hu/ckfinder/userfiles/files/72315112971.pdfIn PDF document text
    • http://www.agot.pl/upload/file/wikuxosus.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_off0000b36a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB36A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cb7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB7C 14652 bytes
SHA-256: 1ba06ceadf136edb21e8f0d69faf41aeead36bee20664670526f88f059f29880
font_02_sfnt_off0000f05f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF05F 10564 bytes
SHA-256: b6cdbbc2b5ff024c80092ea832fd08dfe9c4f9e659fe3cc145aec874f831b1c9

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