Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c8d0de787429b56…

MALICIOUS

PDF

81.7 KB Created: 2021-09-17 18:32:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 0d19f754527b08e714184c4727d8dd56 SHA-1: 1f61068b967a952e56ce213886c03e0233aa2313 SHA-256: 0c8d0de787429b56295835a16eccbe04c4735a10a1e2a88f09b401ef5513ae8d
156 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, with multiple heuristics indicating it functions as a link farm. The embedded URLs point to various domains, some of which are associated with compromised CMS uploads or disposable hosting, suggesting a phishing or malware distribution scheme. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://laborke.ru/uplcv?utm_term=ip+address+android+device PDF link annotation
    • http://eastindiaspray.com/suvra/eastindia_spray/files/31100507613.pdfIn PDF document text
    • https://avukat.dnsaktif.net/upload/files/jufabamuvuk.pdfIn PDF document text
    • https://kingcarmotorista.net/uploads/files/dabufaba.pdfIn PDF document text
    • https://ekinyalitim.com/depo/sayfaresim/file/viwafularafofi.pdfIn PDF document text
    • http://tvcsoltau.de/userfiles/file/gonalabamarupatumosila.pdfIn PDF document text
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f731d490db---11892608281.pdfIn PDF document text
    • https://bbox.ru/images/shared/file/11734605469.pdfIn PDF document text
    • http://theemasternetworker.com/ckfinder/userfiles/files/woraxivabuwerif.pdfIn PDF document text
    • https://adtw1.elfjane.com/ckfinder/userfiles/files/79796352300.pdfIn PDF document text
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1612fac533813f---neputujojezik.pdfIn PDF document text
    • http://ecme.site/2015/vat/upload/files/38701167476.pdfIn PDF document text
    • http://olech-rzeszow.pl/userfiles/file/27625415895.pdfIn PDF document text
    • https://www.arc-welding.co.uk/wp-content/plugins/super-forms/uploads/php/files/7s3se8pr7dueekkt1l5d1g8grv/fefaladewovog.pdfIn PDF document text
    • http://www.fdconsult.qa/public/uploads/cms_files/44768393536.pdfIn PDF document text
    • http://trustycctv.com/ckfinder/userfiles/files/jeposodidipiwexifuvejoxag.pdfIn PDF document text
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133b1f741f39---88185590927.pdfIn PDF document text
    • http://nrgmedia.hu/files/file/jodenukun.pdfIn PDF document text
    • https://desertflying.club/wp-content/plugins/formcraft/file-upload/server/content/files/16138ada1c00ac---67209125463.pdfIn PDF document text
    • http://www.adarshvidhyasankul.org/userfilesfile/renitobowinububizolurite.pdfIn PDF document text
    • http://kibbkw.com/uploads/file/83501768805.pdfIn PDF document text
    • http://myucpb.net/userfiles/file/57730089697.pdfIn PDF document text
    • https://xtremefitness.com.au/application/third_party/ckfinder/userfiles/files/vopexunezax.pdfIn PDF document text
    • http://bluebirdcanada.com/FileData/ckfinder/files/20210911_0E593FCFBA88DDE7.pdfIn PDF document text
    • https://www.azulejositurry.com/wp-content/plugins/super-forms/uploads/php/files/9g3cv9m4lfp37uludchmr952q0/42548829116.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_off0000dafd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAFD 10380 bytes
SHA-256: 653389c71bd0c030f08a5add0b559df0d6918118f171b15139bf1efe2a6bc7b0
font_01_sfnt_off0000f294.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF294 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010aa6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AA6 17856 bytes
SHA-256: 7ae58d6f2ec6a7c1f2c0fcb431f269d294c96e54e7f0274d581fd90621079784

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