Malicious PDF — malware analysis report

Static analysis result for SHA-256 9814e79488a862d1…

MALICIOUS

PDF

90.0 KB Created: 2021-09-10 00:29:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: b9afea7a37d548f6ff7b9d3526c2b563 SHA-1: 0e7d23f3957fcd6f31c0373b3d5b26a97cc1bee6 SHA-256: 9814e79488a862d15a3f59bb8da5fce23fa2c4176f5dbf4b0bb0149dea875a57
156 Risk Score

Malware Insights

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

The PDF was flagged by a machine learning classifier and ClamAV as malicious. It contains numerous embedded URLs, many of which point to domains that appear to be compromised or disposable, suggesting a link farm designed to redirect users to malicious sites. The presence of these links and the overall structure indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://homeshopeez.com/uploaded_files/userfiles/files/mufoluloburugibojeseg.pdf In PDF document text
    • https://muacash.com/webroot/img/files/zajugujemiledegudoditiber.pdfIn PDF document text
    • https://nffcd.org/userfiles/files/20764418776.pdfIn PDF document text
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161369e9b60385---6125914638.pdfIn PDF document text
    • http://riverside-plaza.com/upload/userfile/files/19429570374.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134da123b8d8---67009062929.pdfIn PDF document text
    • https://rumputhijau.com/contents/files/14442806797.pdfIn PDF document text
    • http://videofilm-tv.ru/content/File/82215985532.pdfIn PDF document text
    • http://kovacsoltvaskerites.hu/images/file/momagovelesorifejitolak.pdfIn PDF document text
    • http://kleinschadenexperte.com/userfiles/file/bigajegoxuvorudimir.pdfIn PDF document text
    • https://skl.deindrukdemo.nl/upload/files/45725943574.pdfIn PDF document text
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/8481bc5b9b311909be97ff3e380b6a25/15337732062.pdfIn PDF document text
    • https://www.liftechforklifts.com.au/application/third_party/ckfinder/userfiles/files/11064298913.pdfIn PDF document text
    • https://predial-rua-nova.pt/056-CovadaLua/images-editor/file/13204456039.pdfIn PDF document text
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/161346522459a1---27215793060.pdfIn PDF document text
    • https://commonwealthsportsawards.com/userfiles/file/pijosobidatizisub.pdfIn PDF document text
    • https://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/c05a26f9a6dee660a94fc64c6e1643c2/miduja.pdfIn PDF document text
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613256ac9dc37---vedimofipise.pdfIn PDF document text
    • http://www.darvidproperty.com/news/file/gobavalotukimelujolisi.pdfIn PDF document text
    • http://diagnosticaedilizia.com/userfiles/files/92217180796.pdfIn PDF document text
    • https://viadagio.be/userfiles/file/safepetoxatelisebekon.pdfIn PDF document text
    • https://valgott.com/images/userfiles/file/diwimaforuxorap.pdfIn PDF document text
    • https://atavio.ru/files/file/pividor.pdfIn PDF document text
    • http://angelescare.com/userfiles/file/40567831130.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=1000+c%2B%2B+programs+pdfPDF 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_off0000fa5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA5C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011273.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11273 10568 bytes
SHA-256: 41e591921f6bd7f9940c1411b5746014afef95e0d900c96a44bf044d0baf4fb4
font_02_sfnt_off00012a55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A55 18496 bytes
SHA-256: a624d165659e8fdcc1be3f373406959abe5eb230d7d0bdbfd8c91d3b5c4bba13

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