Malicious PDF — malware analysis report

Static analysis result for SHA-256 b558314d7c8cadb3…

MALICIOUS

PDF

95.4 KB Created: 2021-08-10 20:45:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: a0adacfa7cb8f92646c9bcd018307ba1 SHA-1: 442377bf4a0bb4fd62410ea29f0ccfbc2d0d0710 SHA-256: b558314d7c8cadb34384878cd9fab4b8269fcd35f3fe5941a38f6110951e9aad
156 Risk Score

Malware Insights

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

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

Machine Learning

  • Nyx PDF Classifier malicious score 0.9928

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://nomylo.ru/uplcv?utm_term=east+anchorage+high+school+football+schedule PDF link annotation
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/16108d914e1a85---vuvijosonazakowut.pdfIn PDF document text
    • http://vvk-wiedermann.at/userfiles/file/fuxagile.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/fokawikovusulelanodo.pdfIn PDF document text
    • http://www.saito-ken.jp/userdata/file/45779222997.pdfIn PDF document text
    • https://gionggiacam.com/ckfinder/userfiles/files/zajudonobalelexatowiso.pdfIn PDF document text
    • http://azizolace.cz/images/file/89380367806.pdfIn PDF document text
    • https://optical-axis.com/uploads//files/202108051719173847.pdfIn PDF document text
    • http://al-bandak.com/userfiles/file/rekevixinagugefavafadu.pdfIn PDF document text
    • http://nuyewrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/2cff71fd272609a24a6b9457985b4dc1/mesuvun.pdfIn PDF document text
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16088553115316---64063794326.pdfIn PDF document text
    • https://yssnewlessons.org/UserFilesTwo/file/vebanizopejodolobimonoruz.pdfIn PDF document text
    • http://www.grupohk.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bc0e60c9368---85504028211.pdfIn PDF document text
    • http://polipack.ru/content/file/84345733397.pdfIn PDF document text
    • https://joepromenshealth.com/wp-content/plugins/super-forms/uploads/php/files/f3497efcc414582657912cafa608ff35/fotoxogajatu.pdfIn PDF document text
    • https://greyquotient.com/wp-content/plugins/super-forms/uploads/php/files/6420dfdd5c42c9050da4d687f346b421/81929480735.pdfIn PDF document text
    • http://tomaszfilipczak.pl/userfiles/file/59504295116.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7ef40966f---bomikaburezesalomegup.pdfIn PDF document text
    • https://www.sanier.pl/wp-content/plugins/super-forms/uploads/php/files/96t91oab71php506fb6sio09a3/timelofada.pdfIn PDF document text
    • https://rajakeempat.com/contents//files/20745784413.pdfIn PDF document text
    • https://www.harnoordesigns.com/wp-content/plugins/super-forms/uploads/php/files/3424935e0e9d58f61aa4bd3c54602d2f/genutiminuzut.pdfIn PDF document text
    • http://dlikefulproductions.com/clients/875850/File/35697177756.pdfIn PDF document text
    • http://krasneclanky.cz/uploads/jukirabepodupenijakikosok.pdfIn PDF document text
    • http://zhengfutz.com/v15/Upload/file/20216121512477130.pdfIn PDF document text
    • http://www.urbanwaterways.info/files/2831060002.pdfIn PDF document text
    • http://cambridgekapurthala.com/damana/userfiles/file/jewojuxogeli.pdfIn PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/16083b60b59188---79377294769.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_off00010e4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E4A 17892 bytes
SHA-256: 0c9fdff25198f3c43139646ddf515cdb59acfd5c30f7d8b817cea2c667658082
font_01_sfnt_off00013d57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D57 10976 bytes
SHA-256: df33a72ccc560ad7dfa44d8497d640676a32b0cdb994a34608914a4b4a71d547
font_02_sfnt_off00015689.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15689 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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