Malicious PDF — malware analysis report

Static analysis result for SHA-256 7e4a8cab9e87f50a…

MALICIOUS

PDF

82.2 KB Created: 2021-09-17 06:45:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 31f59c50ced75623f959d4c0f8672ad1 SHA-1: 03ec5c4cf7a24069979dd04eda9a079e1b2a8a90 SHA-256: 7e4a8cab9e87f50a2c7a71693faf7e8777c976e13b11b442bbc6b0be17d6f3f3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple compromised websites, suggesting an attempt to trick users into downloading further malicious content. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics, along with numerous unknown URLs, strongly indicates a phishing or malware distribution scheme. No scripts were extracted, but the overall structure points to a social engineering attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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 http://traslochimontalto.it/userfiles/files/42940115143.pdf In PDF document text
    • http://jobsandhi.com/uploaded_files/userfiles/files/16060840124.pdfIn PDF document text
    • http://johnlillylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/27432399366.pdfIn PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/161403300013de---jararitasolufoxam.pdfIn PDF document text
    • https://cualuoihoanmy.com/uploads/userfiles/file/jurevilova.pdfIn PDF document text
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132d446d2668---tizunokobuwov.pdfIn PDF document text
    • http://www.gpe-el.pro/ckfinder/userfiles/files/72434632919.pdfIn PDF document text
    • http://aquaclub.hu/userfiles/file/70964368478.pdfIn PDF document text
    • https://natinsel.com/imagenes/file/sidowoloxukuledadomi.pdfIn PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/16144081ed0aca---25811977146.pdfIn PDF document text
    • http://bargiel.com.pl/ckfinder/userfiles/files/dupujofizef.pdfIn PDF document text
    • https://kenkochaya.com/user_data/ckfinder/files/53704489802.pdfIn PDF document text
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/161421bd0444ee---turoved.pdfIn PDF document text
    • https://astoriareiki.com/wp-content/plugins/super-forms/uploads/php/files/ef86a065fc7da1bd21a090eb298c674c/75331770189.pdfIn PDF document text
    • https://bccphil.paramedix.biz/uploadfiles/file/48231848006.pdfIn PDF document text
    • http://psychologkmalinowska.pl/ckfinder/userfiles/files/muxumutegusanamebob.pdfIn PDF document text
    • http://arcos-eff.it/userfiles/files/jisivuwanuvonumogosaf.pdfIn PDF document text
    • https://silverbirdmarketing.com/pages/images/file/27483141961.pdfIn PDF document text
    • https://www.popcaffe.it/wp-content/plugins/super-forms/uploads/php/files/e3a1dbcfae6d5230d9f4946dc6455e60/ratudujajepixekotadovef.pdfIn PDF document text
    • https://bibliotheque-des-arts.ch/ckfinder/userfiles/files/kimuzanininevebafi.pdfIn PDF document text
    • https://searchkar.com/ci/userfiles/files/33610356095.pdfIn PDF document text
    • http://studioturina.com/userfiles/files/dapaxe.pdfIn PDF document text
    • http://alternativefitness.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613317a35c007---71915617954.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=hogatoga+app+download+screen+lockPDF 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_off0000dd71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD71 17208 bytes
SHA-256: 7bc110ac4712474ab257eec2fd185638d913b7af1bcc0375276c2b87ebe0b568
font_01_sfnt_off00010a31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A31 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012248.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12248 10764 bytes
SHA-256: e2b5249b85464e04c5649d4b85a8d6cf4323a6424da36b744935c1cc97cb8ee2

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