Malicious PDF — malware analysis report

Static analysis result for SHA-256 98ee7e310b3cfb88…

MALICIOUS

PDF

78.4 KB Created: 2021-09-03 03:51:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: ee143459de0e459ebbc33cd9297859e8 SHA-1: 11a67194caf0e0cd2f554ae6cc2c2ad8ce928662 SHA-256: 98ee7e310b3cfb88fd87b38d5e0251518b8b2ce6f17c98e8f21031004c29df78
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution via these links.

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://inijariku.com/ckfinder/userfiles/files/waruvimewasegajegulira.pdf In PDF document text
    • http://www.sevenchurchestour.net/seven/wp-content/plugins/formcraft/file-upload/server/content/files/1607bcd0d72940---36581871783.pdfIn PDF document text
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160a57a4f401cd---81591378207.pdfIn PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1612e56560f65c---lonanodulujukimizegolit.pdfIn PDF document text
    • http://kwong-cheong.com/userfiles/40611963100.pdfIn PDF document text
    • http://leinerpakgelatine.com/survey/userfiles/files/wabagizaxulaf.pdfIn PDF document text
    • http://debsluxe.com/clients/1/17/174397649ed9f07baa8f9d9f48c72a4d/File/tenerifimetugivijiwo.pdfIn PDF document text
    • http://abwpetersburg.com/uploads/files/36719616652.pdfIn PDF document text
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/160718ef8e03c1---2825923031.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/055249e6a616b97cade934d3e94c4b1a/satikezugutafutuginek.pdfIn PDF document text
    • http://hy-concrete.ru/d/files/nubotovedakepumedu.pdfIn PDF document text
    • http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b0f84538265---lozuledekemokolam.pdfIn PDF document text
    • https://forkidsvietnam.vn/wp-content/plugins/super-forms/uploads/php/files/lok3tf3oumikj7u52qhusnu3ok/datodiwovezolifegadulupo.pdfIn PDF document text
    • http://pomodorolennep.de/gfx/userfiles/files/galebazurotom.pdfIn PDF document text
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f5039c2b89---nodolorajajeparesoxabeto.pdfIn PDF document text
    • https://grahampropertytax.com/wp-content/plugins/super-forms/uploads/php/files/d4b04a99d468e42e4266b39827e9ac11/fagiwivovuromulimoxu.pdfIn PDF document text
    • http://ankurgroups.com/userfiles/file/motogadobazatapino.pdfIn PDF document text
    • http://massageindex.nl/images/uploads/74915905182.pdfIn PDF document text
    • http://stonebreaker.at/jepurobirenidezaned.pdfIn PDF document text
    • http://vanlysecurity.vn/vanly/album/files/3658075763.pdfIn PDF document text
    • http://dierenwinkelindex.nl/images/uploads/pibifusawileverulutuwukif.pdfIn PDF document text
    • http://conroeclassof72.com/clients/d/de/de0acc14889d5d69ce6a2e221f3e79cd/File/daronedoxonew.pdfIn PDF document text
    • https://abcoegypt.com/userfiles/files/vuvasodonofumofifexux.pdfIn PDF document text
    • http://orthodoxvaidikasanghom.org/userfiles/file/26407612900.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=heat+treatment+selection+and+application+of+tool+steels+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_off0000cdd0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDD0 10772 bytes
SHA-256: c48e97525e31471f6d00e20a41859fac67e707020682697dad305a7eaaab61a7
font_01_sfnt_off0000e685.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE685 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fe97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE97 17508 bytes
SHA-256: a8149b54c81c79be968dbaa876944b4de6c066ee6f76b2c8f4bb302a2908efb1

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