Malicious PDF — malware analysis report

Static analysis result for SHA-256 b87048adbbc19057…

MALICIOUS

PDF

142.1 KB Created: 2021-07-02 12:05:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 66f4910d487710c266a5c24c4eb52183 SHA-1: b6b774cc95705d9a83bebb069ce927cb9968f29e SHA-256: b87048adbbc1905763ef04ca9854665a1d5865ed7401713d677378ae1b6cf5e8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The sample is a PDF file identified as malicious by ML classifiers and ClamAV. It contains numerous embedded URLs, many of which point to compromised CMS upload directories, forming a link farm. These links are likely intended to redirect the user to phishing pages or further malware. The presence of multiple compromised hosts and the structure of the PDF suggest a coordinated effort to distribute malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9922

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://journeywithmypet.com/ckfinder/userfiles/files/37057828583.pdf In PDF document text
    • http://amctop.com/board_data/editor_img/file/202106251618.pdfIn PDF document text
    • https://balance-global.com/wp-content/plugins/super-forms/uploads/php/files/rvpj8etkpvjqirndbsm1gq4kkm/nerivosubaw.pdfIn PDF document text
    • https://lolakarimova.uz/ckfinder/userfiles/files/424597902.pdfIn PDF document text
    • https://space1500.com/wp-content/plugins/super-forms/uploads/php/files/df9eb1971c5a297c237c0e96317a4158/zuniluzadidifoxebazipu.pdfIn PDF document text
    • https://www.tangelo.no/wp-content/plugins/formcraft/file-upload/server/content/files/16083f27a065f2---91036092866.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16070b9b75dda0---lemunirawowovu.pdfIn PDF document text
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097c2cac5576---14048451838.pdfIn PDF document text
    • http://mhinflatable.com/upload/file/4528720727.pdfIn PDF document text
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160764d5c6ebdc---xilafi.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607306cdb8e7f---90992517823.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3a274cc1ae---mewalodojugoki.pdfIn PDF document text
    • https://praward.tw/wp-content/plugins/super-forms/uploads/php/files/96830092ce79d8d6f2125babe3d2b4b5/96511876221.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/76972869869.pdfIn PDF document text
    • https://bonafideonline.com.ar/wp-content/plugins/super-forms/uploads/php/files/e3516c9beb70e785885817809f011c7b/vodegikakupumurit.pdfIn PDF document text
    • http://birzebbugastpetersfc.com/files/file/88452199793.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608e4ad0c1526---wusiboponorolo.pdfIn PDF document text
    • https://lawpropertyconsultants.co.uk/wp-content/plugins/super-forms/uploads/php/files/4e7sshqeq77sb0oran73ptnq3i/43951170089.pdfIn PDF document text
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/85b91a041ae4efb874b9386b0d6582c6/98344434112.pdfIn PDF document text
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160bc2fd333719---82548821441.pdfIn PDF document text
    • https://associazionedynamica.it/uploads/file/kiwegakowinelote.pdfIn PDF document text
    • http://ijdssymposium.eu/upload/komumutoxagegapivepe.pdfIn PDF document text
    • http://beastyenergy.com/userfiles/file/rezowoku.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=eso+march+of+sacrifices+guidePDF 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_off0001c569.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C569 10760 bytes
SHA-256: ab77f034b8b99f38166922213af09afdcecccf7d105dbd02c7592a21b33ea859
font_01_sfnt_off0001dde8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1DDE8 19220 bytes
SHA-256: 139c8729d75926ae9dee19089674af2d956db81c689e7e4b069e2cb0389a9546
font_02_sfnt_off000210ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x210EA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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