Malicious PDF — malware analysis report

Static analysis result for SHA-256 d7fad5a212130c77…

MALICIOUS

PDF

90.2 KB Created: 2021-07-15 19:43:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 30d2b1465b9113690f34bdd56787633c SHA-1: b88c34780acb052030c314583c6e7cbd6b21d928 SHA-256: d7fad5a212130c77cc34d80778c4e644cf9e62c411f0d5f50b25e5a96fc75537
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous URLs that point to compromised WordPress sites and other domains. These links likely serve as lures for phishing attacks or to distribute further malware. The PDF structure itself does not contain executable content, but its primary purpose is to redirect users to malicious external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9822

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://www.opdrrustukalac.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c3bb429334---24618766481.pdf In PDF document text
    • https://medsplus.us/admin/images/file/rajizotul.pdfIn PDF document text
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/160addbb2e1f15---39403956895.pdfIn PDF document text
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609265b230855---45227456662.pdfIn PDF document text
    • http://agendatourvietnam.com/hinhanh/file/40652291752.pdfIn PDF document text
    • http://brandweeramsterdamamstellanden.nl/userfiles/file/48756686351.pdfIn PDF document text
    • https://ontime-taxi.kg/wp-content/plugins/super-forms/uploads/php/files/1174502888c7dc4f902bd0dcdc0c8335/39204190995.pdfIn PDF document text
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16089e81ea5323---83377800435.pdfIn PDF document text
    • http://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/eb8d5c4f2e55199c207fe39092c06559/binijipuw.pdfIn PDF document text
    • http://mineraux-et-lithotherapie.fr/ckeditor/upload/files/63522164417.pdfIn PDF document text
    • https://www.alignerco.ca/wp-content/plugins/super-forms/uploads/php/files/19195d3f4565eb6c58ea8eca9008010f/44721871796.pdfIn PDF document text
    • https://zold-kommando.hu/files/jijexusozowasemelepito.pdfIn PDF document text
    • http://xn--l3cbpp3gh4a5g5c.com/userfiles/files/rogevesovamigunotize.pdfIn PDF document text
    • https://alshamiltrading.com/alshamilfiles/file/lujus.pdfIn PDF document text
    • https://workinhotel.com/upload/fckfile/38349359433.pdfIn PDF document text
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609840d256a16---47961861698.pdfIn PDF document text
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/ol67umddg70uqh3mopru561hba/mupexukanexene.pdfIn PDF document text
    • http://rufullthrottle.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7d6b8fbc2---nokekiwabidu.pdfIn PDF document text
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/9be6a5aad1b600761178e99d2312fa7d/tumatabanekowed.pdfIn PDF document text
    • http://homelife-superstars.com/image/files/80112369410.pdfIn PDF document text
    • http://shangrilatheshow.com/ckfinder/userfiles/files/87221480254.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/7ef7255872dbfa0f341f8e1a1e8a99da/lujadeki.pdfIn PDF document text
    • https://xlux.vn/wp-content/plugins/super-forms/uploads/php/files/clvki8bhasnpdhbunofcb3ttgc/tuguvone.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/32996939015.pdfIn PDF document text
    • https://doitsolutions.co/wp-content/plugins/super-forms/uploads/php/files/aeffa086cf08c5f32cc23e7b0cc3a055/63291625826.pdfIn PDF document text
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/a6bd03ac830a543b74987cd7ae8efea4/vilineranol.pdfIn PDF document text
    • http://cukiernia-waltar.pl/qcms/userfiles/file/rebakozazi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=share+market+working+hoursPDF 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_off0000fb4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB4A 10860 bytes
SHA-256: ff1561aec7ea133fb23a9b16d2fc1d631d0d3c29d81130376ee617726f5918b7
font_01_sfnt_off0001144a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1144A 18048 bytes
SHA-256: ee040079ad69119e6b9e4081932cc19f98c34150c4d4f9242fafeb27c7287557
font_02_sfnt_off00014354.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14354 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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