Malicious PDF — malware analysis report

Static analysis result for SHA-256 82a9812b01f22a97…

MALICIOUS

PDF

80.4 KB Created: 2021-08-03 15:47:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 956ac5c2958a0eaa9c22d34d20942bb4 SHA-1: 2db16f4f1573c383315ef55f6f03c19606ddaa5a SHA-256: 82a9812b01f22a97014c3a81e65bffc8d09c921915d9bcb973e9d38484b039c1
164 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of multiple URLs, including one hosted on a compromised WordPress site, suggests a link farm designed to redirect users to malicious content or phishing pages. The 'SE_DOWNLOAD_BUTTON' heuristic further supports the idea that the document is designed to trick users into downloading something.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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 http://sweetbasketsbyjackie.com/clients/864293/File/sevuremerapena.pdf In PDF document text
    • http://sanga.asia/userData/board/file/zotozimuket.pdfIn PDF document text
    • http://d4smontreal.com/clients/f/f5/f58105ca183540932673f5bf18e62671/File/pimutewanidewarolu.pdfIn PDF document text
    • http://sjhrz.com/images/upload/File/33949568333.pdfIn PDF document text
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160a4ac4d1228a---8148807033.pdfIn PDF document text
    • http://dzbnf.com/upload/file///78054913160.pdfIn PDF document text
    • http://vorne-sitzen.eu/pcms/content/file/xodufunuvuzivu.pdfIn PDF document text
    • http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d8af42c3ef1---11470368790.pdfIn PDF document text
    • http://ccforum.kr/uploads/file/1622349764.pdfIn PDF document text
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bc0fa47408e---gapokavof.pdfIn PDF document text
    • http://baliretreatcenter.com/olabali_ci/media/images/newsfiles/66895320305.pdfIn PDF document text
    • http://digifast.cz/userfiles/polimofetigugugojon.pdfIn PDF document text
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160903c8a87708---90577044817.pdfIn PDF document text
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/ccca4a2e17b829e14d148782d195abe5/64643335002.pdfIn PDF document text
    • https://yourlightingbrand.com/wp-content/plugins/super-forms/uploads/php/files/956dca6aaa3011bd606887348496a2de/lamogijidifo.pdfIn PDF document text
    • http://zentrumok.com/userfile/files/35712150794.pdfIn PDF document text
    • https://outsourcedbackoffice.co.uk/wp-content/plugins/super-forms/uploads/php/files/8420613c23ac388482617891490320ca/10944027761.pdfIn PDF document text
    • http://zonweringbelgie.be/ckfinder/userfiles/files/66856854472.pdfIn PDF document text
    • http://firewheels.pe/userfiles/file/64258833673.pdfIn PDF document text
    • http://atrsara.ir/resource/files/77712462498.pdfIn PDF document text
    • http://brezov-gaj.si/uporabnik/file/wamiwuz.pdfIn PDF document text
    • https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/dd8f51d0b6f2ccf60bbc0c9bf88f8b5f/40356501362.pdfIn PDF document text
    • http://csc0351.com/userfiles/file/20210708025611_lfo8vr.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=introducci%C3%B3n+a+la+biolog%C3%ADa+celular+alberts+3ta+edici%C3%B3n+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_off0000d040.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD040 11360 bytes
SHA-256: 8e1144af8a808ba5000390bc9312e1e3a68fc7e750c68b11ff4ab42c820480e8
font_01_sfnt_off0000ea69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA69 18048 bytes
SHA-256: 99e2642ad0f964d5a179f4617eb43cdf928d937c495e7cc3dcd70fb92ad0b034
font_02_sfnt_off00011804.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11804 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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