Malicious PDF — malware analysis report

Static analysis result for SHA-256 d9bd98a0e074b7d8…

MALICIOUS

PDF

79.8 KB Created: 2021-09-11 12:02:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 0816b465bee4d8a77e76e5730341ee7a SHA-1: 0db0a560c82beb8ad419d7508b6c0695cc39ef81 SHA-256: d9bd98a0e074b7d84a44eb8e52b016aa747a94a5057d8ecb09a6410aaf1b8eb7
164 Risk Score

Malware Insights

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

The PDF contains a link farm with numerous URLs, many hosted on compromised or disposable domains, indicating a malicious intent to redirect users. The ML classifier and ClamAV detection strongly suggest this PDF is malicious, likely serving as a lure for phishing or malware distribution. The presence of a 'download button' heuristic further supports the idea that the document is designed to trick users into clicking links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://shuimotongyuan.com/userfiles/file/xegavixapovaz.pdf In PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/4142261502a75ede7016b6b818d40cff/rupirisobukofiwaturem.pdfIn PDF document text
    • http://qdxqw.com/uploadfile/file/85380355789.pdfIn PDF document text
    • http://khacvietlaser.vn/public/images_news/files/reviraximuruduv.pdfIn PDF document text
    • http://artgraf24.pl/userfiles/file/xalujubami.pdfIn PDF document text
    • http://kingkady.cn/uploadfile/files/8057228981.pdfIn PDF document text
    • http://anabakorea.jp/userfiles/file/60920925239.pdfIn PDF document text
    • https://forkidsvietnam.vn/wp-content/plugins/super-forms/uploads/php/files/7mjh5p26iqlpquf4d020ok1ei9/lagobogomijuwepat.pdfIn PDF document text
    • https://playworkspartnership.ca/sites/default/files/file/wubugagonifalazov.pdfIn PDF document text
    • https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/m6u2h03du5nqstvgqubmmhkic1/11684489990.pdfIn PDF document text
    • https://renfrewareahealthvillage.ca/ckfinder/userfiles/files/29025590965.pdfIn PDF document text
    • http://tvsatkrosno.pl/userfiles/file/dotebudij.pdfIn PDF document text
    • https://altinhediyeler.com/calisma2/files/uploads/96189975537.pdfIn PDF document text
    • https://mimpishio1.com/contents/files/83476797445.pdfIn PDF document text
    • http://ebiocell.com/uploadfile/file///2021091011530978.pdfIn PDF document text
    • http://incomingmakedonia.com/files/files/52969911524.pdfIn PDF document text
    • http://gyarmatilovastorna.hu/userfiles/file/60257001708.pdfIn PDF document text
    • https://j26clean.com/upload/files/20655182113.pdfIn PDF document text
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/1612f0981a1a09---segexinu.pdfIn PDF document text
    • http://allmedicus.com/userfiles/file/damumonegurele.pdfIn PDF document text
    • http://micronforgacsolo.hu/UserFiles/file/77170673757.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=mini+militia+mod+shd+unlimited+healthPDF 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_off0000d34a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD34A 10504 bytes
SHA-256: 7cd3566d22636398e33199c30f8d3b44b60097c353e97b6c33740425a74d4913
font_01_sfnt_off0000eafa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAFA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001030c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1030C 17552 bytes
SHA-256: 19d4a7f348f85f25cef9f4fd5db99ecd8190deaf5958c1e595111950389ce415

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