Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f91305c732dc0ae…

MALICIOUS

PDF

78.2 KB Created: 2021-09-07 09:45:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: d18a5a1f205622c4eec5866428d6533b SHA-1: c0e4593378306d9ebe37990335164985525f7fb9 SHA-256: 6f91305c732dc0ae153c67345472f38874f3011a38cb2243495b2b0fc1de6925
164 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to potentially compromised websites or disposable hosting, suggesting a phishing or malware distribution scheme. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically highlights the use of disposable hosting and UTM parameters, common in SEO poisoning and phishing campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

Heuristics 7

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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=grade+8+math+questions+and+answers+pdf PDF link annotation
    • http://adabaskimerkezi.com/upload/file/kusijuxawunewibevim.pdfIn PDF document text
    • https://classykitchen.pl/web/uploads/files/66657697385.pdfIn PDF document text
    • http://townofwinslowin.com/flash/townofwinslowin.com/file/mopivuvaroj.pdfIn PDF document text
    • https://www.mnspineandsport.com/wp-content/plugins/super-forms/uploads/php/files/c096e4a9a32bfb004455cac757290601/juwebe.pdfIn PDF document text
    • http://itaindustrial.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c4fb5cdcc17---44220164061.pdfIn PDF document text
    • https://p87.hu/files/sijadifupekotukivedu.pdfIn PDF document text
    • https://progin.ch/ckfinder/userfiles/files/jabezavagojenakenijiked.pdfIn PDF document text
    • http://konferencii.org/web/uploads/assets/file/sipekugufule.pdfIn PDF document text
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160733e059591d---diwigewipofimabejaw.pdfIn PDF document text
    • http://detskaoptika.cz/ckfinder/userfiles/files/8895080679.pdfIn PDF document text
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/1610ed95720d52---ruzemojubimuxukukudodux.pdfIn PDF document text
    • http://masan315.net/board/imagefile/file/xodes.pdfIn PDF document text
    • https://www.karavanlakesfet.com/wp-content/plugins/super-forms/uploads/php/files/f4a9c5ca74b9d4e9e64a574560aad14c/fonaxedaruwagugemuwazuf.pdfIn PDF document text
    • https://svetpoznaniyaonline.ru/wp-content/plugins/super-forms/uploads/php/files/7c69c30e77b0a749aaab9b668498538c/mapilenizewejafikuwedame.pdfIn PDF document text
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b85c80dac9b---3931975315.pdfIn PDF document text
    • http://nrgmedia.hu/files/file/dotavisesamebobodanono.pdfIn PDF document text
    • https://anmimar.com/royal/userfiles/file/bepogebegapak.pdfIn PDF document text
    • http://ophirtonhotel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160b0e279cbb8a---jipip.pdfIn PDF document text
    • https://indikino.com/ckfinder/userfiles/files/78985465872.pdfIn PDF document text
    • https://at1-turbo-j3t.com/contents//files/bexokudufarosiwe.pdfIn PDF document text
    • http://pfmconsulting.org/survey/userfiles/files/ladifiwov.pdfIn PDF document text
    • https://connect.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/208ffbe141a1e3b54d9a74fecb528d0f/runavamakubajotirafisamit.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/mifvrkhnmtpv0esgu2r1efp521/60094291668.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cb75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB75 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e387.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE387 17556 bytes
SHA-256: 20c8c878236f086dff59769d65c9e2b257faeb8d11e2bf964f55d76ff908f0b3
font_02_sfnt_off000110fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110FD 11296 bytes
SHA-256: 3972800ed80b212f0b01baa77e895aed680a1a5174bacd0f1940b543b3175517

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