Malicious PDF — malware analysis report

Static analysis result for SHA-256 b126f124b8ec4da6…

MALICIOUS

PDF

91.1 KB Created: 2021-07-23 13:15:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 7699b82166adbcc834721b30243e90f8 SHA-1: f1ee4c971f0de8a4402e98240f0abd60afd03677 SHA-256: b126f124b8ec4da62134e866d24b0d0338ced05af81bc58ea12259dedebd8836
156 Risk Score

Malware Insights

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

This PDF was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to other PDFs hosted on compromised websites. The primary attack pattern involves luring users to click these links, potentially leading to phishing or further malware downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://ddriu.hu/wp-content/plugins/super-forms/uploads/php/files/6e38fb6eee710938743e890611814fb3/ralobatawoluwefiw.pdf In PDF document text
    • https://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160b31690360a4---97944729705.pdfIn PDF document text
    • http://naucseto.cz/storage/nobin.pdfIn PDF document text
    • https://bluetact.com/ckfinder/userfiles/files/17508877632.pdfIn PDF document text
    • http://bochosushi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608536226e6ba---fafaxusixowodalisukog.pdfIn PDF document text
    • https://prosegik.com/wp-content/plugins/super-forms/uploads/php/files/ee303a6f5dc7fe97e3bf02e69a5ffc8f/53187842864.pdfIn PDF document text
    • http://zeroseistudio.eu/userfiles/files/lobexolapidoko.pdfIn PDF document text
    • http://trans-serwis.com/userfiles/file/tokibebitidenorefosel.pdfIn PDF document text
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e93d0c08e4d---68613618035.pdfIn PDF document text
    • https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160adffedb03a9---29070931966.pdfIn PDF document text
    • http://anticacarsulaeborzoi.eu/userfiles/files/75634601969.pdfIn PDF document text
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160818c5417960---18679011587.pdfIn PDF document text
    • https://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/79c86b0ac7a644fc78d80bedc4d733b2/rudituber.pdfIn PDF document text
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e8f70785b0c---tugaxezedisuj.pdfIn PDF document text
    • https://btcauction.vn/hinhanh/file/92827124671.pdfIn PDF document text
    • http://aite-materials.com/upfiles/file/83744988450.pdfIn PDF document text
    • http://villa-carlshorst.de/sites/default/files/file/69227078184.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b06c6c200e4---jobebozirikilorij.pdfIn PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1e65962681---42609743909.pdfIn PDF document text
    • http://bugaboo-buffalo.eu/UserFiles/File/73673951811.pdfIn PDF document text
    • https://forcechicago.com/wp-content/plugins/super-forms/uploads/php/files/6a2b080a586bae7769d6400631100bf4/silegofunawudipiwirove.pdfIn PDF document text
    • http://daegyung.kr/userfiles/file/20210723132939.pdfIn PDF document text
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/oe9sd1kldp9a568taoohq5vg83/tovogodutazewodekazaj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=a+simple+thank+you+would+sufficePDF 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_off0000fd83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD83 11156 bytes
SHA-256: 1e87a3e7d2c9321c04592aab413e97e547d8517dacd319fb0b38489350516ec8
font_01_sfnt_off00011788.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11788 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012f9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F9A 17736 bytes
SHA-256: 40ad2e53641dc8f55329687837a95ef7216db2c8cc3b83e032d363c0e51d14ee

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