Malicious PDF — malware analysis report

Static analysis result for SHA-256 f05c569d2a848b03…

MALICIOUS

PDF

82.2 KB Created: 2021-09-03 09:35:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 491aef3fe96b228e1944fa1ac7e21d6b SHA-1: 08061c19cd67cb897d3a6a24796590dfbf6755fd SHA-256: f05c569d2a848b037bb7ecffb5d2a9a5ec23bd747e24aad63edea53d446ae9e8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://garglob.ru/uplcv?utm_term=esl+past+tense+worksheet PDF link annotation
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160732a1f0ae08---zagumejemunaludeveme.pdfIn PDF document text
    • https://detector-billetes.com/Imagenes/file/94071774444.pdfIn PDF document text
    • https://www.helpforbusymums.com/wp-content/plugins/super-forms/uploads/php/files/cceaeacc64b58d03c970b7a1996dcbf5/lunetisimi.pdfIn PDF document text
    • http://innobiztour.com/FileData/ckfinder/files/20210730_6D60C82FB3386390.pdfIn PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca5e2a9b4c---demotuz.pdfIn PDF document text
    • https://autoandtruckrepair.net/nbloom/fckuploads/file/biledukadixitan.pdfIn PDF document text
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609265c789c45---gonisazapojitod.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160c724928f1c7---88974882090.pdfIn PDF document text
    • https://fnb-concepts.com/images/uploads/files/mesolasenijak.pdfIn PDF document text
    • http://soundreaming.org/wp-content/plugins/super-forms/uploads/php/files/90a1ba581058776f64472be7fe01ab9d/52887320392.pdfIn PDF document text
    • http://lltsg.com/uploadfile/file///2021071222310152.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/83d0d61d74cca897cae80fd80be30d08/75408283443.pdfIn PDF document text
    • http://orosweb.hu/ckfinder/userfiles/files/35845397523.pdfIn PDF document text
    • https://lamaisonducoeur.ca/upload/editor/file/78869334562.pdfIn PDF document text
    • http://effektfilm.de/files/file/lebotijosiguzobuvedegur.pdfIn PDF document text
    • http://scissortailfarms.com/wp-content/plugins/formcraft/file-upload/server/content/files/160793e4d66113---fijutuximebenaxofesugawad.pdfIn PDF document text
    • http://hidramaco.com/files/files/33620978227.pdfIn PDF document text
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/ppqom1noae7mtr08fikbjq7et0/13458404782.pdfIn PDF document text
    • http://assistance.uz/images/shared/file/bagabojarexeretovufir.pdfIn PDF document text
    • https://successalpha.team/upload/files/64806035092.pdfIn PDF document text
    • http://agiusfuneraldirectors.com/files/file/96372544075.pdfIn PDF document text
    • https://filetorme.com/upload/files/mobesimebani.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_off0000d998.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD998 10416 bytes
SHA-256: 59e81ee3f175a2597232a72cb87f95102c8d59cf6ea1c39703e2183118a2b0ee
font_01_sfnt_off0000f144.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF144 19096 bytes
SHA-256: 99456a9f1ed5f8ab22a95167de945c400b0588219d7d2094f73e1c591b713372
font_02_sfnt_off0001234a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1234A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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