Malicious PDF — malware analysis report

Static analysis result for SHA-256 8653abb5a17c2191…

MALICIOUS

PDF

83.2 KB Created: 2021-09-20 00:08:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 4f66de3d0a72df2a42a85ef4a4886a4c SHA-1: f83b36da7589007eaf27a9cbec873989073991c0 SHA-256: 8653abb5a17c2191dca267fcc8911e3e3ce0e57422d632ed76f6be17c69381e3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many hosted on compromised or disposable domains, indicating a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are consistent with a malicious PDF dropper.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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://www.syria-report.com/sites/all/libraries/ckfinder/userfiles/files/wozevakiv.pdf In PDF document text
    • http://autosklo.sk/pictures/file/zofejabizobovazusepoked.pdfIn PDF document text
    • http://ihanzao.com/userfiles/file/20210903104258_294271427.pdfIn PDF document text
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132b54a28f43---34735346882.pdfIn PDF document text
    • http://bradhelferlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/668188581.pdfIn PDF document text
    • https://apz-arte.com/ckfinder/userfiles/files/242613533.pdfIn PDF document text
    • http://justsayhi365.com/uploads/file/49482573662.pdfIn PDF document text
    • http://1day2night.com/UserFiles/file/gadipaletanugis.pdfIn PDF document text
    • http://pspectr.ru/userfiles/file/dinidupubonoxadakaduj.pdfIn PDF document text
    • http://iweldbot.com/ckfinder/pho/files/87461286977.pdfIn PDF document text
    • https://pasarangroup1.com/contents/files/fikinanerijoje.pdfIn PDF document text
    • https://phr4u.com/files/28754064291.pdfIn PDF document text
    • http://foxadv.net/file/63001495176.pdfIn PDF document text
    • http://www.eau-msu.ru/ckfinder/userfiles/files/88581325292.pdfIn PDF document text
    • https://granitnet.hu/editor_up/tanogimataxanila.pdfIn PDF document text
    • http://cissi.it/userfiles/files/94008364452.pdfIn PDF document text
    • https://fetogram.com/images/upload/files/wimam.pdfIn PDF document text
    • https://willes-gb.com/uploads/files/202109160805161260.pdfIn PDF document text
    • http://biblioteka-belzec.pl/upload/files/32306150320.pdfIn PDF document text
    • https://enilubricant.hoakhanh.vn/uploads/image/files/56950106181.pdfIn PDF document text
    • https://www.sophrologue-nimes.fr/upload/news/files/22853333878.pdfIn PDF document text
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/99bfaaf51b99bbd9b9245c4d9f92192b/84545112321.pdfIn PDF document text
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/dfd40f5cb4e2b02b0d07f77c113e1fdb/megagirugizutita.pdfIn PDF document text
    • http://srihemkuntsahibfgp.org/hemkunt/userfiles/file/ramudolerima.pdfIn PDF document text
    • http://dinobajka.pl/Upload/file/bizujiguluga.pdfIn PDF document text
    • https://eltdb.com/UserFiles/files/mexanajovijo.pdfIn PDF document text
    • http://anhbanglaw.com/userfiles/file/menoj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=eac3+audio+format+not+supported+mx+playerPDF 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_off0000dc7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC7D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f48f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF48F 18472 bytes
SHA-256: 3958ef15db5838e998eb11161e038db6fe22c57ae4dd21aca4f840eb3c3b840e
font_02_sfnt_off0001244c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1244C 11252 bytes
SHA-256: 0cde6c1fd94ef24551c146957d6d36fdee66258b3d088167fc12556f1b35b577

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