Malicious PDF — malware analysis report

Static analysis result for SHA-256 6bd62b7df4e21fea…

MALICIOUS

PDF

99.1 KB Created: 2021-09-14 11:22:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: d04ac6118a2e6e09976c042bb271ff44 SHA-1: 41edf4268dab5b968d51b0d7c2622fc41d7adacf SHA-256: 6bd62b7df4e21fea20332e814ccb17aa946f80ef773723b7c623228fda1961ef
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to other PDF files hosted on potentially compromised websites, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. The document body is heavily obfuscated and does not provide direct clues to the specific attack, but the overall structure and URL findings point to a multi-stage distribution scheme.

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://mayxaydunghoangphuc.com/userfiles/files/60560637023.pdf In PDF document text
    • http://888chji.com/userfiles/files/nesumuzarixow.pdfIn PDF document text
    • http://gzlmjx.com/data/home/bxu2343160066/htdocs/uploadfile/files/43105653164.pdfIn PDF document text
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/o3tk04pjjeuhbo5pqe6vkmhrci/4733672139.pdfIn PDF document text
    • http://dayuntang.com/assets/uploads/ckedit/files/20210902003124.pdfIn PDF document text
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/1612f6b4f7d769---leziporanobiforawufufip.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/ft5hl7ajrl1bjgqruebsmdb0h3/kejaz.pdfIn PDF document text
    • https://betsin.org/userfiles/files/9129130312.pdfIn PDF document text
    • http://ydis.kr/userfiles/file/131950368259.pdfIn PDF document text
    • http://wksx.top/images/userfiles/file/208390169.pdfIn PDF document text
    • https://bestcaps99.com/ckfinder/userfiles/files/jexuzirozakeg.pdfIn PDF document text
    • https://lexcyberia.com/userfiles/files/46988259187.pdfIn PDF document text
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/1613b181880cdc---woriranomitaxufetega.pdfIn PDF document text
    • https://oceanflowerhotel.com/uploads/image/files/zuzuxoxezonizozi.pdfIn PDF document text
    • http://tranhdaquydep.vn/upload/files/posovu.pdfIn PDF document text
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613075b067452---demipudut.pdfIn PDF document text
    • http://formpart.com/upload/ckfinder/files/pibinadidurelibijetu.pdfIn PDF document text
    • http://ulsantour.com/FileData/ckfinder/files/20210902_1F6769F14CB648FC.pdfIn PDF document text
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/161312b2e6513a---lavubupo.pdfIn PDF document text
    • http://insfilings.com/skyzone_classic/upload/files/nafalegeg.pdfIn PDF document text
    • https://www.ruchya.com.tw/upload/files/tosetu.pdfIn PDF document text
    • http://debten.net/UserFiles/File/relukevimirigazalafivex.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=chicago+med+full+episodes+freePDF 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_off00011b19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B19 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001332b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1332B 19172 bytes
SHA-256: 459394c9264e057ea9ef52a2547b7ed68ebe3388f30c20251928303f14ba7260
font_02_sfnt_off00016540.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16540 10996 bytes
SHA-256: 6e6794828e8c1783adc3c672511c62f2bbcf360d0fe7b545fa61c8ac50828b40

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