Malicious PDF — malware analysis report

Static analysis result for SHA-256 2d9547a7079052e9…

MALICIOUS

PDF

76.7 KB Created: 2021-09-08 05:02:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: c2063de7666d6582136c17abcee370e8 SHA-1: 2d9294b39953ef3db728d50c5a3a8315f49ce08f SHA-256: 2d9547a7079052e91872ea32abff8e1b4967b0343aec7734bc9e46e4434d4f62
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The file functions as a link farm, with numerous embedded URLs pointing to compromised WordPress upload directories and other disposable hosting. These links likely serve as lures for phishing attacks or to distribute further malware payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://smidgel.ru/uplcv?utm_term=comparative+anatomy+of+vertebrates+pdf PDF link annotation
    • https://www.varishastalari.com/wp-content/plugins/formcraft/file-upload/server/content/files/160905438803f1---kizise.pdfIn PDF document text
    • http://cunningham-reunion.com/clients/7/73/7399477c88ef979e1ad3ac38e42cffcc/File/kizezukadoxave.pdfIn PDF document text
    • https://laihouston.com/wp-content/plugins/super-forms/uploads/php/files/6df56b8ebab6dd8577cc4751b0e921ab/liritanabitazibopofipez.pdfIn PDF document text
    • https://tractorpulling-emmeloord.nl/upload/file/24101077430.pdfIn PDF document text
    • http://noithattamphuong.com/upload/files/jivoxorivedibowekenulik.pdfIn PDF document text
    • http://pogotowienaukowe.com/Upload/file/xoxasuxuke.pdfIn PDF document text
    • https://thinkhigh-tech.com/d/files/jokixotekoki.pdfIn PDF document text
    • https://divanich96.ru/admin/ckfinder/userfiles/files/84395150993.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/n3vdft85etfcec1rn5igesa8kq/duwidigiloza.pdfIn PDF document text
    • http://shiokuda1.com/contents//files/74244682587.pdfIn PDF document text
    • http://abwmountvernon.com/uploads/files/77747937025.pdfIn PDF document text
    • http://montesantangelo.it/files/files/19009726350.pdfIn PDF document text
    • http://eaas-journal.org/survey/userfiles/files/lutox.pdfIn PDF document text
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/257eb166d1f083473d74c49e983c8741/muruzutep.pdfIn PDF document text
    • http://jrmhandling.nl/upload/file/24768700416.pdfIn PDF document text
    • http://studiosiriosrl.it/userfiles/files/80003191035.pdfIn PDF document text
    • https://hamzsabegi60szallo.hu/UserFiles/File/4345923143.pdfIn PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16128805acdfba---xuset.pdfIn PDF document text
    • http://natproperty.com/userfiles/files/27009104924.pdfIn PDF document text
    • https://nslogisticservice.com/userfiles/files/80857711161.pdfIn PDF document text
    • https://tonitomov.com/picture/file/lezuxarake.pdfIn PDF document text
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e6fd8c85956---93962967567.pdfIn PDF document text
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160989c9576492---fizekabukezuxoxepu.pdfIn PDF document text
    • 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_off0000c5bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5BC 10964 bytes
SHA-256: fb97e5db16335fce0d6474624deb273ae69b0096c8769f88026650c513c3dff3
font_01_sfnt_off0000df01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF01 17816 bytes
SHA-256: feef29e8b7bf489e1867ea94c6ffde06553e58d9f37dcf102be7a5ef141e3ec4
font_02_sfnt_off00010d06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D06 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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