Malicious PDF — malware analysis report

Static analysis result for SHA-256 8279276c301fcb35…

MALICIOUS

PDF

98.0 KB Created: 2021-07-04 12:33:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 16405c428200902fcb242fff4feba2a6 SHA-1: 5bd86e75f6133e4900cb186eb52c5fa26bc61287 SHA-256: 8279276c301fcb351bbea36e8936265ad6ff344580dd6ac80a25f6ad94bcaee3
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress sites and disposable hosting. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware. The file's structure as a link farm suggests it's designed to redirect users to malicious content hosted on these external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9681

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://allytemp.ru/uplcv?utm_term=map+of+canaan+during+joshua%27s+time PDF link annotation
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/42528606c0a39cd1b5b4301cec212aad/nelifo.pdfIn PDF document text
    • http://peak-experience-japan.com/gusoluxipelerusuderog.pdfIn PDF document text
    • http://accessibilite-salle-eau.com/ckfinder/userfiles/files/20097941636.pdfIn PDF document text
    • http://tipsclubcr.com/campannas/file/zutugufewetaziji.pdfIn PDF document text
    • http://istrouma1971.com/clients/9/9b/9b88b062b8d6af44b28e209fcb06d7d5/File/beduwovorasadikudizunite.pdfIn PDF document text
    • https://reflexlighting.com/wp-content/plugins/super-forms/uploads/php/files/d201dc39a15350518c5bc2bb4e4bab9a/motabezi.pdfIn PDF document text
    • http://flambotour.it/themes/userfiles//files/gujunedagoludagulin.pdfIn PDF document text
    • https://securitydm.com/slicice/file/76535659006.pdfIn PDF document text
    • https://www.blackandwhite-salon.com/wp-content/plugins/super-forms/uploads/php/files/4de49757430bce1af78c7fdf0f3efc5d/93714249093.pdfIn PDF document text
    • http://benthanhsgfarm.net/images/uploads/files/41364859147.pdfIn PDF document text
    • https://kimtuong.vn/isc/public/files/fckupload/file/bovuvepabudaf.pdfIn PDF document text
    • http://carriewoodfamily.com/clients/5/5b/5b9f2fb360c4065436fb7fe1267c3612/File/giredojele.pdfIn PDF document text
    • http://zoncmswebsitebeheer.nl/files/editor/file/xakotuworosopomudemedo.pdfIn PDF document text
    • https://dineflon.com//files/81767716978.pdfIn PDF document text
    • https://sf-tfi-pgu.uz/wp-content/plugins/super-forms/uploads/php/files/7cd71c09a76511ce5f0f157a4b5cda7b/foron.pdfIn PDF document text
    • http://mahkotacare.com/tmr/userfiles/files/dezunujojomixu.pdfIn PDF document text
    • http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c98b5a8d495---63947715820.pdfIn PDF document text
    • https://qualitymattressfactory.com/admin/userfiles/file/2249530809.pdfIn PDF document text
    • https://oxi-dental.ro/imagini_ws/nuwoxe.pdfIn PDF document text
    • http://www.restorationservice.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160ab2ca4881b9---69528699134.pdfIn PDF document text
    • http://fdscience.com/UPFILE/userfiles/files/rexinira.pdfIn PDF document text
    • http://wchs67.com/clients/f/fd/fd50fd9748f3592dabdfdad26f378f15/File/76718218673.pdfIn PDF document text
    • http://status-go.net/gfx/userfiles/files/92729467827.pdfIn PDF document text
    • https://www.reachcast.ca/wp-content/plugins/super-forms/uploads/php/files/77aaff8092a9a89590e88f73f2d83139/remowebufojoxapogimokitef.pdfIn PDF document text
    • https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/k1abj15072o95b5oo6r61pukfm/85984839680.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7327f05664---64446281797.pdfIn PDF document text
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d16d175a54---tekelisudolevegixetubapir.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000101ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101EA 11276 bytes
SHA-256: 821e0edc198270b73c0a3661c0b2e7e11206ba5335548f43937e85379558bf39
font_01_sfnt_off00011c05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C05 17568 bytes
SHA-256: c3c3731737fc572843bc244af2f26f1bad60e689eb10deefc9f41e9112dc467a
font_02_sfnt_off00014994.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14994 16748 bytes
SHA-256: c18e59a2bf2f5c7fb997954a6772174f61a11f834efd826e3e61e9d6232de59f
font_03_sfnt_off00016183.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16183 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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