Malicious PDF — malware analysis report

Static analysis result for SHA-256 da867664da415e5a…

MALICIOUS

PDF

83.8 KB Created: 2021-09-02 18:23:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: ee0d729a597bb3d15bf2b20b672aa954 SHA-1: 5ac9db61e73b993c0d32c7064b74ee26d6bede9d SHA-256: da867664da415e5a3f543968f022b46157a10cc919dfb85c8e9b80bec7a5782a
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to compromised WordPress upload directories, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent. The primary attack pattern involves directing users to potentially harmful external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://lacecinella.com/writable/public/userfiles/file/41285639565.pdf In PDF document text
    • http://slenderclub.cz/ckfinder/userfiles/files/pebezazidedipofubuf.pdfIn PDF document text
    • http://otohondamientay.com/upload/files/18828507913.pdfIn PDF document text
    • https://hantverksakuten.se/ckfinder/userfiles/files/bokuwesozad.pdfIn PDF document text
    • https://cambodiadriverservice.com/userfiles/file/98691124735.pdfIn PDF document text
    • https://bandotrading.com/uploads/file/4936791255.pdfIn PDF document text
    • https://xn--80aaaglcftt5alesfkk7f.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/e7fa1ca1f075694b37eda1b417b8a024/89869731630.pdfIn PDF document text
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074bf6b8150e---jefoxesagovamelevevos.pdfIn PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609b006e7faf8---wiradanolejutuze.pdfIn PDF document text
    • https://danielfelber.ch/userfiles/file/wawigubolagupesoporanup.pdfIn PDF document text
    • http://kubak-ubezpieczenia.pl/userfiles/file/51436222786.pdfIn PDF document text
    • http://deauville.ru/files/file/wevukiniwebunu.pdfIn PDF document text
    • https://sckprime.com/wp-content/plugins/super-forms/uploads/php/files/c8addeacdac14103c15dfbf84fa94ca2/44782668683.pdfIn PDF document text
    • https://medok18.ru/wp-content/plugins/super-forms/uploads/php/files/dc64bcd0159e753b93e90eb83c647469/806617642.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/1607126fa4418d---puzanakanimevun.pdfIn PDF document text
    • http://enslev-anlaegsservice.dk/userfiles/file/99964127997.pdfIn PDF document text
    • https://wholisticvibrations.com/wp-content/plugins/super-forms/uploads/php/files/5aa1c69fabd1fe01ba0ed3b981535e32/sebetizerixavak.pdfIn PDF document text
    • https://howardsteeves.com/wp-content/plugins/super-forms/uploads/php/files/fae0b76fee12826531b73463383d684b/90776876157.pdfIn PDF document text
    • http://portakalweb.net/home/portakal/public_html/ckfinder/userfiles/files/75440998858.pdfIn PDF document text
    • http://capmar.eu/userfiles/file/sadigitalugeveb.pdfIn PDF document text
    • https://www.horisunmauritius.com/wp-content/plugins/super-forms/uploads/php/files/fad0fcf11b45c97d28ba559024b8e00a/21428405309.pdfIn PDF document text
    • http://accessoriesunlimitedinc.net/catalog/file/finobadat.pdfIn PDF document text
    • https://dongphuchuytai.com/upload/files/1104894135.pdfIn PDF document text
    • http://milwaukee.center/userfiles/file/felanuxopuvulatebasobosu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=ortografia+questoes+pdfPDF 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_off0000e0ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0AB 18800 bytes
SHA-256: f7561fed87f6cf2c7f727a8c7820f212e05b93b63d3a8cd5b49d13f7192a9041
font_01_sfnt_off000110c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110C8 10796 bytes
SHA-256: 6eb1334dac68ff5a8651aaad3a616648c728c3f6ac52cc2ae9c43005a2b635d9
font_02_sfnt_off00012956.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12956 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1