Malicious PDF — malware analysis report

Static analysis result for SHA-256 22088b3b272c9da1…

MALICIOUS

PDF

86.2 KB Created: 2021-07-31 03:48:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 711fdffbdb8876276025cfd8a8f15cf6 SHA-1: 865f9fe5066ef8060f518a11088664d20e190844 SHA-256: 22088b3b272c9da177444768f59c5545342cf6053fcbf7eca9d32d09b58629e8
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised WordPress sites or disposable domains, suggesting a link farm designed to distribute malicious files. The presence of a 'download button' heuristic further supports the lure of downloading a file. ClamAV detection and ML classification confirm the malicious nature of the PDF, likely acting as a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 https://queure.ru/uplcv?utm_term=marvel+encyclopedia+new+edition+pdf+free+download PDF link annotation
    • https://vernadoc.com/wp-content/plugins/super-forms/uploads/php/files/c73dd00b2effeded5d8ccc07afdd168e/wuluwe.pdfIn PDF document text
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1609e8dee93aed---dijujaduroxovibupokapefun.pdfIn PDF document text
    • https://fallsplat.se/file/ramuzepijaxufif.pdfIn PDF document text
    • http://sarljarry.fr/userfiles/file/rizujiwasav.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d6ad1650d3---53799956930.pdfIn PDF document text
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/160918a8245c40---bidekuxelagonid.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a2d0bad1039---dorevenanofe.pdfIn PDF document text
    • http://mdbim.pl/ubezpiecz/obrazy/file/37024176785.pdfIn PDF document text
    • https://tramtron.vn/uploads/files/files/32151085546.pdfIn PDF document text
    • http://builderall.info/userfiles/file/48318361094.pdfIn PDF document text
    • https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/0bf1df7cd2113b5eabbc9ec592b15c4d/9319558635.pdfIn PDF document text
    • https://forkidsvietnam.vn/wp-content/plugins/super-forms/uploads/php/files/mpa057nsf1bsdhmn8qaccijq54/jiporomo.pdfIn PDF document text
    • https://www.charityweiss.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607d5632658bf---raloderagizujogedi.pdfIn PDF document text
    • http://mediaworld.pro/ckfinder/userfiles/files/kafutitepijidadomuse.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160f5bef2c8f08---munavukaxugukefewelom.pdfIn PDF document text
    • http://mav-auto.ru/images/file/99883711052.pdfIn PDF document text
    • https://afanasyev-design.ru/wp-content/plugins/super-forms/uploads/php/files/3dd0f30ef8d9cbb3cd7482eb0b934e42/74240306626.pdfIn PDF document text
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/48433274a6ef4c114bfa89d6fcee2898/dodinawijurubusukosuva.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/vobqjbhd7t67ou7shh6bm4g3h3/zemeviwakabokukivanagepop.pdfIn PDF document text
    • https://ahha.az/userfiles/file/navalezureduwopife.pdfIn PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607b19039b96a---kavofozi.pdfIn PDF document text
    • https://shining4u.com/wp-content/plugins/super-forms/uploads/php/files/12f1d1f120146261348248ec88a5fa40/disejonobiw.pdfIn PDF document text
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b0b502ef1a9---wafugiponu.pdfIn PDF document text
    • http://wildpflanzen-planung.de/file/tebabinoboranilasawowojuf.pdfIn PDF document text
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f0f2c60fd99---67781588017.pdfIn PDF document text
    • 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_off0000e974.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE974 10704 bytes
SHA-256: df06b3e6d717335c64a2a1cd5d788c84fccbbfcea8e889be0c7a611e2c215c12
font_01_sfnt_off00010230.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10230 18616 bytes
SHA-256: 2c8f1adb31a071e5be2b2ed57d200eaec63b3553617df66f0ede775bf03e2e79
font_02_sfnt_off000132f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132F6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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