Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf710939585e9e64…

MALICIOUS

PDF

68.9 KB Created: 2021-09-29 13:50:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 64a647ee360d69c031398692932c49df SHA-1: f3f1769009f2e402c4e45cf864e0aa524adb6367 SHA-256: bf710939585e9e64c512c879f958a9774d06a9e12454daedbc49e4cb57a761cd
156 Risk Score

Malware Insights

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

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with many embedded URLs pointing to unknown or potentially compromised domains. The presence of multiple unknown URLs suggests an attempt to direct users to malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

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://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/f7cb37b0f90b2ad6e319dbd042997c3d/8706632425.pdf In PDF document text
    • https://arbormaster.us/uploads/files/22605942969.pdfIn PDF document text
    • http://kfoodntea.com/dataroom/file/digosibebiga.pdfIn PDF document text
    • https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/3i0n4si59kbsgu28lp0aqqbv0v/87499106617.pdfIn PDF document text
    • http://kukdae.com/files/fckeditor/file/30268305286.pdfIn PDF document text
    • https://proetcontra.hu/userfiles/file/fanifatikebigisepopesobel.pdfIn PDF document text
    • http://hoaphathotel.com/luutru/files/mikujowolegasapege.pdfIn PDF document text
    • http://dungcumaymoc.com/Images_upload/files/wegupinarizomebin.pdfIn PDF document text
    • http://vinaaquachem.com/uploads/files/85833445592.pdfIn PDF document text
    • https://fertilizerproductionprocess.com/d/files/gufulonewoxegudizo.pdfIn PDF document text
    • https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/0dfd230b4dbe28adcd61d18fb0323e76/6096088623.pdfIn PDF document text
    • https://shen-su.eu/gfx/userfiles/files/vifoporugelomijape.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/161393da97dab3---73964861082.pdfIn PDF document text
    • http://nadafashionbelt.com/Uploads/file/878099074.pdfIn PDF document text
    • http://boardmark.com/files/file/vibigepak.pdfIn PDF document text
    • http://orvosvalaszto.hu/uploads/files/tavutakipebadevazotak.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613243ad1a8ca---1851055363.pdfIn PDF document text
    • https://sportyou.fr/ckfinder/userfiles/files/xadovelebilixi.pdfIn PDF document text
    • https://pilot-nav.socksnbows.com/ckfinder/userfiles/files/dapikedim.pdfIn PDF document text
    • https://anmimar.com/royal/userfiles/file/21011919005.pdfIn PDF document text
    • http://fsgzb.com/upfolder/e/files/20210916150035.pdfIn PDF document text
    • http://seoulsquare.com/userfiles/file/tobexefutegojame.pdfIn PDF document text
    • http://elijasprojekts.lv/files/file/zobemobinak.pdfIn PDF document text
    • http://www.pantonerestauri.com/ckfinder/userfiles/files/jemawazoluxudefuz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=hcr2+update+2021PDF 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_off0000aec7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAEC7 10364 bytes
SHA-256: 852c37c3070c6eddca9216c4ce68cfdf112e8549b18d6e075a6a68ff541ab0f4
font_01_sfnt_off0000c661.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC661 15152 bytes
SHA-256: 06f4f31a80002f0868cef64904e3f29297b65c53c7dcced1fd4cc74364819780
font_02_sfnt_off0000ecab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECAB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1