Malicious PDF — malware analysis report

Static analysis result for SHA-256 78976119ea107e04…

MALICIOUS

PDF

74.5 KB Created: 2021-09-10 19:16:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: d650299b743e34d15aee47e5b746c3e7 SHA-1: 2e3c928694bf28f5339d04571c4448a58245cf30 SHA-256: 78976119ea107e04a2be9cda10204ca99aa2dac3373b83c6e9e37aa3ea1a0812
156 Risk Score

Malware Insights

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

The sample is identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to multiple external URLs, some hosted on compromised CMS platforms. The primary goal appears to be redirecting users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9885

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://ryouhurt.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/bapet.pdf In PDF document text
    • http://uniondrygoods.com/fckeditor/userfiles/file/vuxokofekilirulozamuletol.pdfIn PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613407ca2e181---10437175702.pdfIn PDF document text
    • https://073741256.com/uploads/files/202109061821101070.pdfIn PDF document text
    • http://enjoybowlramenandpoke.com/uploads/files/bosijixarowusefaluku.pdfIn PDF document text
    • http://taikenplan.jp/ckfinder/userfiles/files/56859233281.pdfIn PDF document text
    • http://delta-serwis.pl/pliki/50726495765.pdfIn PDF document text
    • http://1yunnan.com/ckfinder/userfiles/files/62997094037.pdfIn PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1613a049e92c54---8519036955.pdfIn PDF document text
    • http://thai-apsproducts.com/file_media/file_image/file/zogosorifok.pdfIn PDF document text
    • http://ilturismoinitalia.it/userfiles/files/14048451274.pdfIn PDF document text
    • https://hometeamcorp.com/images/usr/noborekevagimixewe.pdfIn PDF document text
    • http://dealershop.es/camarasegovia/userfiles/file/zijuwadatixuka.pdfIn PDF document text
    • http://bc-arman.kz/ckfinder/userfiles/files/43246097423.pdfIn PDF document text
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/8ec2482d9f690a2928477b004d6f8273/zexutibafagedapex.pdfIn PDF document text
    • http://zdrowejaja.com/Upload/file/94400691962.pdfIn PDF document text
    • https://valubil.com/public/uploads/cms_file/cms_files/pimabapofemeri.pdfIn PDF document text
    • http://vaness-sens.fr/ckfinder/userfiles/files/90806736042.pdfIn PDF document text
    • http://allineers.morefriendship.com/upload/files/poroxolivawobijaxelebab.pdfIn PDF document text
    • http://prime42.ru/userfiles/files/lerugepifefopusin.pdfIn PDF document text
    • https://hantverksakuten.se/ckfinder/userfiles/files/1240629637.pdfIn PDF document text
    • http://iccjsc.vn/images/uploads/files/30696584271.pdfIn PDF document text
    • http://negaratoto.com/contents/files/gomigowodutogilako.pdfIn PDF document text
    • http://vitalbafitnessclub.eu/userfiles/files/wajebi.pdfIn PDF document text
    • http://www.afamaresme.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613b3ed0bf4bb---10834382770.pdfIn PDF document text
    • https://www.cifphosteleriayturismo.es/ckfinder/userfiles/files/47540306196.pdfIn PDF document text
    • https://hamayeshniroo.com/shop/file/gipavatoxoj.pdfIn PDF document text
    • http://mazraeir.com/images/upload/files/24664584432.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=how+to+extract+data+from+dead+phonePDF 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_off0000c01a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC01A 17064 bytes
SHA-256: 7e788df347e1a7d0b7b1edc2127b96e820f3b0f13541f6362299bce60e92c485
font_01_sfnt_off0000eba2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBA2 10756 bytes
SHA-256: c95eed4f8964726fa52ab399355498954d4134aa5d7127ecbc65970c3c2f1906
font_02_sfnt_off00010439.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10439 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1