Malicious PDF — malware analysis report

Static analysis result for SHA-256 7df11b44094d917b…

MALICIOUS

PDF

80.4 KB Created: 2021-06-24 23:12:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 0e091ec2b06dc83f9e63b18e1dd05e93 SHA-1: 0416625b3a95fed54547e95cdebdbc8c3ef5b799 SHA-256: 7df11b44094d917b715bfebc9a2080d20477943a7455c8e3adc61764babeaf55
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs that form link farms, many hosted on domains identified as potentially compromised or disposable. The document body, though heavily obfuscated, contains references to 'Web pdf editor' and 'wkhtmltopdf', suggesting a lure to a fake utility that redirects to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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 http://srihemkuntsahibfgp.org/hemkunt/userfiles/file/93066630944.pdf In PDF document text
    • http://gtlmarinefuel.com/userfiles/file/11492230892.pdfIn PDF document text
    • http://payassistinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071daf7cf285---dimogipokobiwusabedita.pdfIn PDF document text
    • https://airflow-skateboards.com/upload/file/92743549322.pdfIn PDF document text
    • https://aravlicraft.com/cmsCart//upload/file/kibipujitikivir.pdfIn PDF document text
    • http://romangruszecki.com/uploaded/file/bibavaratamemabolofoj.pdfIn PDF document text
    • http://dobraukraina.org/sites/all/sites/dobraukraina.org/files/57328596713.pdfIn PDF document text
    • https://anpheatingandac.com/nbloom/fckuploads/file/55062646994.pdfIn PDF document text
    • http://mygotour.com/FileData/ckfinder/files/20210618_28070589D0ABA220.pdfIn PDF document text
    • https://famecosmica.it/file/42577752257.pdfIn PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ac283f02cc---bepulutajenoxebe.pdfIn PDF document text
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160a34ccd60f60---40586056130.pdfIn PDF document text
    • https://zweiund40.com/wp-content/plugins/super-forms/uploads/php/files/lefpantmrbcveu6enjj8809f52/29087308077.pdfIn PDF document text
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7c2dd323d2---sonidimebiditiv.pdfIn PDF document text
    • https://goldenparadisestsimons.com/wp-content/plugins/super-forms/uploads/php/files/ad5a5528a898827b86908386524eafe4/sirivepudejal.pdfIn PDF document text
    • https://empylean.com/wp-content/plugins/super-forms/uploads/php/files/nok93544bd297pf8kiejr8308f/90892713148.pdfIn PDF document text
    • https://mmszke.hu/files/file/ruvimupedasugake.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=web+pdf+editorPDF 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://scripts.sil.org/OFLIn 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dd1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD1D 3348 bytes
SHA-256: 14036120a24d1a83b5f4411e221baa2ce378351dbd421a24adee975180a69505
font_01_sfnt_off0000e915.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE915 4768 bytes
SHA-256: c6d58d2eec5332da471387c520073ddcb6a45a8c1985f2e5f91660ef04f62464
font_02_sfnt_off0000f967.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF967 10992 bytes
SHA-256: 0faf432d4cd2d302067f789a586c8179eb0ca7127ee7975de00813fcc5b207dd
font_03_sfnt_off00011f09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F09 16168 bytes
SHA-256: bcfecb9fde4b74e4a2b692e15caf305b2988a1cfe4c6386614002e38d35feb86

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