Malicious PDF — malware analysis report

Static analysis result for SHA-256 67876b2e3f954527…

MALICIOUS

PDF

89.0 KB Created: 2021-08-01 23:59:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 10f3f214d586af8fd26f237d558416d0 SHA-1: a2d5a2bb0228bf4cafd0dda6b34a07d4a4872c4a SHA-256: 67876b2e3f9545278aa720ea8ad9718407f1031d7d8ba165c5fa035b01dfa504
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous embedded URLs, many of which point to compromised CMS upload directories or are hosted on disposable domains, suggesting a link farm designed to redirect users to malicious content. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

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://adaviestransportltd.com/userfiles/file/81814543047.pdf In PDF document text
    • http://bandenplaats.nl/cmsimages/file/53902656668.pdfIn PDF document text
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/u30gi3f9muq1tmflf2haphcpau/94495377895.pdfIn PDF document text
    • https://www.ideaklinikkadikoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160855618303d6---98885702169.pdfIn PDF document text
    • https://creativitagh.com/pevron/www/img/file/jamixiwuzerorub.pdfIn PDF document text
    • http://kochamsushi.pl/UserFiles/file/59664798222.pdfIn PDF document text
    • http://alphasigmaoverseas.com/userfiles/file/peloki.pdfIn PDF document text
    • https://cvsc.co/userfiles/file/18432002488.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/160ccedd785ddd---vovidinejalakunedu.pdfIn PDF document text
    • http://merwepizza.com/upload/file/64968905877.pdfIn PDF document text
    • http://omegapizza.net/uploads/files/xemeguderadamirabomunege.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/160783de609ed5---71588053243.pdfIn PDF document text
    • https://cargoservice.pl/cargoservice/userfiles/file/72817515364.pdfIn PDF document text
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080fb20da36a---41196910490.pdfIn PDF document text
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608526df0d621---45531014999.pdfIn PDF document text
    • https://www.icslights.com/wp-content/plugins/super-forms/uploads/php/files/79ace48cd5ddb63fbb4e77acdc681b30/temotafipaveseluxalunas.pdfIn PDF document text
    • https://wpsqld.com.au/wp-content/plugins/super-forms/uploads/php/files/48f21e2e0173c0f697783a812994b30f/65273513664.pdfIn PDF document text
    • http://kcde.kr/userfiles/file/51166490778.pdfIn PDF document text
    • http://nuraski.pl/wsg/userfiles/mugogagimixofojadabetif.pdfIn PDF document text
    • http://brightwayconsultancyservices.com/userfiles/file/robalakot.pdfIn PDF document text
    • http://fpole.ru/sadm_files/59781410044.pdfIn PDF document text
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b1323467a21---30249639085.pdfIn PDF document text
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f546064cba---moxivazugabesafipugabe.pdfIn PDF document text
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad8efd70869---48546846152.pdfIn PDF document text
    • https://balance-global.com/wp-content/plugins/super-forms/uploads/php/files/luph0m9cdo529appo3kaqsn77f/wivifumi.pdfIn PDF document text
    • https://benjamindreyer.com/wp-content/plugins/super-forms/uploads/php/files/03115304002b0a5739057b229d00b248/xebomarewunivi.pdfIn PDF document text
    • https://www.finestkindcharter.com/wp-content/plugins/formcraft/file-upload/server/content/files/160877b7980348---vedipovudi.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606f224d73f6e---kovokujom.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=grammaire+fran%C3%A7aise+avec+exercices+corrig%C3%A9s+pdf+gratuitPDF 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_off0000f068.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF068 19244 bytes
SHA-256: 30b9a4549ede51dfa1fac4f948f7d3b9ca7f184a3ebd2f98109cda4d4af13a6e
font_01_sfnt_off00012022.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12022 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013839.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13839 11576 bytes
SHA-256: a8162ffe7e3407d00550b4029e49e7b6edbbecd7e9912f30a2c7dbf2701f01e0