Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2d7b09032811c19…

MALICIOUS

PDF

87.2 KB Created: 2021-06-27 15:46:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: de4dd005fd029e9d8f931699c7489b3a SHA-1: 5adc37b9a9546e4f9693b125b02a30067bdcb0cd SHA-256: a2d7b09032811c1961cb6e4dd2146d2cd9d36586bfd9244ab0fd1abfff213d1c
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple compromised WordPress sites and other disposable hosting domains. The embedded URLs suggest an attempt to lead users to phishing pages or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://krisoc.ru/uplcv?utm_term=how+to+turn+text+into+pdf
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/2141ff56c11e0a86394e3d5f397f9951/53359326503.pdf
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/16075cb50a43e6---98170866801.pdf
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/123389f03a36297fb1db88559cd5b119/85972922119.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c9834c303c---jutumokigepulugodok.pdf
    • https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/1cd7898e69080466d4b81ffbcdc37ec1/63707225249.pdf
    • http://www.jamesbgriffinlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160859876e8ae6---28337230125.pdf
    • https://edusfera.pl/upload/file/nebatozobo.pdf
    • https://wilsonbarrera.com/inicio/wp-content/plugins/formcraft/file-upload/server/content/files/160d573e0bf48c---98289951754.pdf
    • https://acryl-bg.com/userfiles/file/lexoxurupobu.pdf
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160aa5bba9720c---76306625466.pdf
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/15ci646aithid38ddkpq160s7t/nevivenobag.pdf
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a081323070---86626335139.pdf
    • http://prosquash.by/data/juzopejo.pdf
    • https://www.infratechgroep.nl/wp-content/plugins/super-forms/uploads/php/files/9e08c796232df12a99a43bccf52879de/savamipekonifik.pdf
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/lfs7mgl0qrnk86qf83vfhkb6f4/89871010194.pdf
    • http://xn--b1akwe.xn--p1ai/userfiles/file/90080332750.pdf
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ef24e0f755---rovatezukotetoturumu.pdf
    • https://www.femregenx.co.za/wp-content/plugins/super-forms/uploads/php/files/9tce25h9dj9rj0scag7nfqiapv/26227879636.pdf
    • https://rittenhousesmiles.com/wp-content/plugins/super-forms/uploads/php/files/e4e31c34cec2b5f731db8ac036ad8c99/81310604973.pdf
    • https://www.ltgpartners.com/wp-content/plugins/super-forms/uploads/php/files/34afbb942098e067d9b0eea1e503c8d5/70811563557.pdf
    • http://atenngo.com/admin/sites/site/documents/kuvutepadexemorirakuru.pdf
    • http://nanobubblevietnam.com/uploads/userfiles/file/rubisosekukimovovate.pdf
    • http://www.advokat.com/app/webroot/img/fck/file/37985713183.pdf
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/sotdckbjioq784me1jal7dm717/54798397505.pdf
    • http://dblbtech.com/userfiles/file/38720792222.pdf
    • 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_off0000f181.bin
23992b99f15874034249562f41824e405463f226b9bd890db7e8b95963194459		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF181 10392 bytes
font_01_sfnt_off00010920.bin
f709e9ec79e606977b025d3a9757f3852815ff439459b17569540b56b49783cd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10920 17200 bytes
font_02_sfnt_off00013616.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13616 16792 bytes

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