Malicious PDF — malware analysis report

Static analysis result for SHA-256 172a5c1a587364cd…

MALICIOUS

PDF

78.6 KB Created: 2021-09-20 00:01:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 356913efe5a612560b2df122cb8a542a SHA-1: cdf3f982a2e14391b16e4c7f77ab4953c6b156be SHA-256: 172a5c1a587364cd61ecfcd293b05abd77a50648b5f67b0848435b3082412dd3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of external links, many pointing to compromised websites or disposable domains, indicating a link farm designed to distribute malicious content or phish users. ClamAV detection and ML classification strongly suggest malicious intent. Although no scripts were explicitly extracted, the nature of the link farm and the detection results point towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://medvor.ru/uplcv?utm_term=android+app+development+in+eclipse PDF link annotation
    • http://ctkupavna.ru/upload/file/tidagelabubokofeva.pdfIn PDF document text
    • http://www.mkkdigital.pt/wp-content/plugins/formcraft/file-upload/server/content/files/16145154c41709---2797757670.pdfIn PDF document text
    • http://condominiobrisasdelnorte.com/userfiles/file/63907599122.pdfIn PDF document text
    • https://hoakhanh.vn/uploads/image/files/nutinirasimewoso.pdfIn PDF document text
    • https://nsck-cykelmotion.dk/userfiles/file/jutedeg.pdfIn PDF document text
    • http://mgtofubbq.com/uploads/files/79247742383.pdfIn PDF document text
    • http://mateuszkucharski.pl/admin/file/togapirakafodig.pdfIn PDF document text
    • https://www.d-table.com/wp-content/plugins/super-forms/uploads/php/files/c934335dbbd0e816831401fd1dc860ca/19609014969.pdfIn PDF document text
    • http://busankid.com/webfiles/board/file///76355080770.pdfIn PDF document text
    • https://egyseg.eu/ckfinder/userfiles/files/2513579142.pdfIn PDF document text
    • http://spc1991.com/ckfinder/userfiles/files/sisudufixiwo.pdfIn PDF document text
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/56ujqsj474gqtq0q0oah0n1f3g/wawogidazeli.pdfIn PDF document text
    • https://triyoga-tv.ru/userfiles/file/63758676967.pdfIn PDF document text
    • https://confidence-ist.com/ckfinder/userfiles/files/62572235720.pdfIn PDF document text
    • http://wirtrauenuns.ch/images/file/ruvovumozikejivosilelita.pdfIn PDF document text
    • http://merklink.nl/site/data/ws/files/riwajomadoweroso.pdfIn PDF document text
    • http://jrpst.pl/userfiles/file/40434744617.pdfIn PDF document text
    • http://pozitron-s.ru/userfiles/file/mogurupufelidemekegop.pdfIn PDF document text
    • http://househouse.it/userfiles/files/23750036863.pdfIn PDF document text
    • https://mimpishio.com/contents/files/gikobuna.pdfIn PDF document text
    • http://uralteplostroy.ru/content/file/56017148555.pdfIn PDF document text
    • http://lavera.it/wp-content/plugins/formcraft/file-upload/server/content/files/161408755be842---23191278477.pdfIn PDF document text
    • http://auswallendorf.de/userfiles/file/64051126436.pdfIn PDF document text
    • http://www.mattig-accounting.bg/fisiere/file/rofudidud.pdfIn PDF document text
    • http://dissanna.com/temp/fckeditor/file/90594913388.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_off0000cd7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD7F 10720 bytes
SHA-256: 5e9dbe00b9c5a76f22cf9fc02bf28df01ab56e92dfc8993ee0e6d87cd2343e7c
font_01_sfnt_off0000e61b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE61B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fe2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE2D 18028 bytes
SHA-256: 6614d580689bb507977540a2b6f1d22ce715c7651935f8dbdac650beeed9fa06

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