Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b473b0268ae52a7…

MALICIOUS

PDF

82.9 KB Created: 2021-07-10 01:53:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c47d16274ebba1ea1b39dd49281a87fd SHA-1: 73425522cc248fa6bd214c23b52e182fb2e07f36 SHA-256: 6b473b0268ae52a747486d73b4d09bd8ff88bf884451b6744f582ef748cfb8e0
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress upload directories and other disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to phishing sites or download further malware. No scripts were extracted, but the link farm structure is a common tactic for distributing malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://hanhthien.net/uploads/file/siteginuporirixilalos.pdf
    • https://goactive.hu/wp-content/plugins/super-forms/uploads/php/files/859dce94c836a66b72284fd652ef3104/3778299465.pdf
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085e8a9de330---36336657269.pdf
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a736cbd13ce---vivavotove.pdf
    • http://amirafouad.com/uploaded_files/file/8992743928.pdf
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16077d9be6e5df---7407823896.pdf
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/16078322019530---wuborobelir.pdf
    • https://jiptv.nl/wp-content/plugins/super-forms/uploads/php/files/jd0d80om4go6t6lp4fv3fof9js/26697539194.pdf
    • https://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/ukuimamit9fc6p8ccibeqoo1r4/79741268524.pdf
    • https://useoneconvo.com/wp-content/plugins/super-forms/uploads/php/files/bd324ec49b77411c7044aa5be38fc463/juloluruda.pdf
    • https://wccia-vastu.com/wp-content/plugins/super-forms/uploads/php/files/385eedb0be2f4349f45e4104404777eb/sepugufelepezogofarefese.pdf
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/160803eb151d31---tazatoworepewivor.pdf
    • https://www.enterpriselighting.com/wp-content/plugins/super-forms/uploads/php/files/22ba4f50acc22c13fd30c66b4d1b711f/natudixiseko.pdf
    • https://tehnol.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160739bab31e7d---winarawabazopeno.pdf
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aff22dd462c---jepirevitib.pdf
    • https://www.blackandwhite-salon.com/wp-content/plugins/super-forms/uploads/php/files/021603155c342ea83e0b2598d6b0abae/fuwewixelokeji.pdf
    • https://veglifekc.org/wp-content/plugins/super-forms/uploads/php/files//60793850194.pdf
    • http://sahrugs.com/userfiles/file/84017880418.pdf
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b8c0e1b32c6---keteruvepidizenet.pdf
    • http://wittlich-luexem.de/userfiles/file/wexetelo.pdf
    • http://rethabise.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16098a838180e0---dokadawejazuxuje.pdf
    • http://megalaserasia.com/upload///burunumuxevobisi.pdf
    • https://airshow-bg.com/file/63067353505.pdf
    • http://mobydick-band.de/fckdata/file/bepajararuwep.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=nice+quotes+to+make+someone+smile
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e2ed.bin
6ca811ba8c35230baca631f967090550b1dc30c475b03496135d2a6eb8d21725		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE2ED 16696 bytes
font_01_sfnt_off00010e0d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10E0D 16792 bytes
font_02_sfnt_off00012624.bin
c5ee123e5704b571bd7f423561a4237fb77cf771983da521c44eacc602c11c30		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12624 10608 bytes

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