Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f9946c7778e47c3…

MALICIOUS

PDF

85.6 KB Created: 2021-06-26 07:24:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 0a8ebfc2e9194bf125e40acaad65f75a SHA-1: 3ec4fb6dea86e6d751d316df03bc7314ace3981e SHA-256: 6f9946c7778e47c35ca82c1b4781e0770ab3ab2292f30ea70074aebd0f9b5d94
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains a link farm pointing to multiple distinct hosts, many of which appear to be compromised WordPress sites hosting other PDF files. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The primary attack pattern involves directing users to these compromised sites, potentially as part of a larger phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bf3be2935c3---54905180951.pdf In PDF document text
    • http://iwish-cosmetics.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085d9e25d6ab---tinubabimil.pdfIn PDF document text
    • http://happyland-nsk.net/ckfinder/userfiles/files/kujexuvuxidez.pdfIn PDF document text
    • https://lightingsystemscol.com/wp-content/plugins/super-forms/uploads/php/files/27893f5c5fbb46b2a040ee680197df02/71386063552.pdfIn PDF document text
    • https://daleplumbinginc.com/wp-content/plugins/super-forms/uploads/php/files/518f1657f8c1f3d84c89a25d04184cca/78071932358.pdfIn PDF document text
    • http://endustriyelkiralama.com/wp-content/plugins/super-forms/uploads/php/files/1bks2fhvsa9upni1ckndtac7r3/55521942124.pdfIn PDF document text
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/1609e1f27d2df0---razugut.pdfIn PDF document text
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/404422ac2fd606c573ec10a883a04ca1/fivufa.pdfIn PDF document text
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/05ffde8c8b78ea3a41c13569ea46040c/51079866206.pdfIn PDF document text
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160ab3ae6aa1f8---22868882809.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/160c13c43641fa---19313331778.pdfIn PDF document text
    • http://www.ambredore.com/wp-content/plugins/formcraft/file-upload/server/content/files/160852bfedba83---gekifamenubetegage.pdfIn PDF document text
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607778889ed9c---7138128301.pdfIn PDF document text
    • http://orgue-chantepie.info/FCKeditor/upload/file/sufuzokoto.pdfIn PDF document text
    • https://chinese-wall.tw/upload/files/85181588500.pdfIn PDF document text
    • https://opsclown.it/ckfinder/userfiles/files/35292201117.pdfIn PDF document text
    • https://infravoip.com/wp-content/plugins/super-forms/uploads/php/files/95d74122cd4a149b0a125702fd6dc958/67161536626.pdfIn PDF document text
    • https://www.aceitedeoliva.com/wp-content/plugins/super-forms/uploads/php/files/8dbfdbe783dafd4219ea08232376f4b5/10942719168.pdfIn PDF document text
    • http://ei-windykacja.pl/upload/file/80814043042.pdfIn PDF document text
    • https://glowskincare.net/wp-content/plugins/super-forms/uploads/php/files/b89d81d03a376aeb4ed3c9c3ae938fdd/64572839568.pdfIn PDF document text
    • http://www.elstar.ru/uploads/files/zowejoguredoxeligimudad.pdfIn PDF document text
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/1607b49bd8c3db---22916235640.pdfIn PDF document text
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609595f0369a0---vubopomofijoxafanugawu.pdfIn PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086ddc8af2cf---ganubemiza.pdfIn PDF document text
    • http://piazzademarini3ge.com/userfiles/files/39427971146.pdfIn PDF document text
    • https://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/ba98bf661c48d3d9d292e1109e0cbd3f/mojusopimit.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=envision+math+book+grade+4+answersPDF 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_off0000ea60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA60 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010272.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10272 17272 bytes
SHA-256: cafd8dc0d9ae1efef6daf4cfc12e062623d7f2025765918f7022dc1c62d58f9b
font_02_sfnt_off00012f5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F5B 11096 bytes
SHA-256: 8c95144f2b84863ee8d2c73f25a4d00816d1ac3da497f6a1d5a9ac8cd5fa9ac0

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