Malicious PDF — malware analysis report

Static analysis result for SHA-256 887b29ea2df16d7d…

MALICIOUS

PDF

96.3 KB Created: 2021-09-20 18:27:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 120b39b7beedf25c1bd305884e7384ac SHA-1: 78466784a72dbfe0a58f0f6fdccfbf894e157067 SHA-256: 887b29ea2df16d7d6ec18d370bb5ee5e24f11d5a8ab0351600c97b7e358ce63b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a link farm directing users to multiple external URLs, with several hosted on compromised CMS platforms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lead users to phishing or malware distribution sites. No scripts were extracted, but the structure and URL analysis point to a phishing or content-luring attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9879

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 http://xn--80aatg4aaaddkhfhbf3evf.xn--p1ai/ckfinder/userfiles/files/gukoripam.pdf In PDF document text
    • https://searchkar.com/ci/userfiles/files/buwaliwisusogivew.pdfIn PDF document text
    • http://artstudiodesign.it/userfiles/files/69179530741.pdfIn PDF document text
    • http://playonathletics.com/userfiles/file/kisibovutigelanivimuvo.pdfIn PDF document text
    • http://marikitaberbagi.com/userfiles/file/18141065969.pdfIn PDF document text
    • http://sanyosushiglendora.com/uploads/files/wopofudiwazubo.pdfIn PDF document text
    • http://unewstoday.com/task/userimages/file/16651919549.pdfIn PDF document text
    • https://www.harnoordesigns.com/wp-content/plugins/super-forms/uploads/php/files/ace8cbc621c306fc3601b2f12905eeb0/24618414821.pdfIn PDF document text
    • http://veganogle.es/uploads/ckfinder/files/gosulipik.pdfIn PDF document text
    • http://skupka23.ru/upload/m/50225933995.pdfIn PDF document text
    • http://finadev-groupe.com/userfiles/file/dobarupusivebujikaw.pdfIn PDF document text
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16133ddecd5497---xajep.pdfIn PDF document text
    • https://happycustomerservice.com/wp-content/plugins/super-forms/uploads/php/files/eaa765b7863f0fe7a28a44b74ce5524b/77032759264.pdfIn PDF document text
    • https://daqing-jewelry.com/uploads/files/202109080348558956.pdfIn PDF document text
    • http://eg-connect.com/uploads/editorfiles/file///44952403766.pdfIn PDF document text
    • https://accidentmatters.com/ckfinder/userfiles/files/39552620153.pdfIn PDF document text
    • http://mistral-paints.cz/userfiles/files/75095319205.pdfIn PDF document text
    • https://univerosg.com/ckfinder/userfiles/files/wavilekasisedilavawufevun.pdfIn PDF document text
    • http://sinocelltech.com/filespath/files/20210920023146.pdfIn PDF document text
    • http://turbotechnik24.de/userfiles/file/xizebes.pdfIn PDF document text
    • http://sunriverps.com/data/editor/file/momawipupozana.pdfIn PDF document text
    • http://patrick-vallot.com/upload/files/22635183344.pdfIn PDF document text
    • http://shepardinteriordesign.com/rw/upload/file/1313574932.pdfIn PDF document text
    • http://obraz-tlt.ru/userfiles/file/mologepe.pdfIn PDF document text
    • http://lor-rostov.su/userfiles/files/95615138272.pdfIn PDF document text
    • https://topclassgardening.nl/images/file/40115573776.pdfIn PDF document text
    • http://emploi.nat.tn/ckeditor/ckfinder/userfiles/files/49250245467.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=biggest+country+in+the+world+by+areaPDF 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_off00011012.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11012 11144 bytes
SHA-256: 762aa77452f6abc330f9c6c1eb49ba3d8fc9bb30b46607c5c2e0c063fe7dd4dc
font_01_sfnt_off000129eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129EB 18808 bytes
SHA-256: 4113ed434b66bba7e586756a47a29cb6cb442f73b8b8b78ca2158141524f8bec
font_02_sfnt_off00015b0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15B0A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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