Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a55e3f431e7cf7c…

MALICIOUS

PDF

87.6 KB Created: 2021-07-24 12:37:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 43043cedb2f805e770840a2b397d6255 SHA-1: 807d28119ace90ad4e73f99d60ce720ed957abf6 SHA-256: 4a55e3f431e7cf7c451c12e864419df7fc8f16b3ba2040a8c5ae3c8b094c0caa
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm pointing to compromised WordPress sites, suggesting an attempt to distribute further malware or phish for credentials. The presence of embedded URLs and the 'download button' heuristic indicate a lure to trick users into downloading malicious content, likely disguised as a driver update.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://hk-dcc.com/wp-content/plugins/super-forms/uploads/php/files/a28efp4ssq7afvglrmvcsdfp99/lurifutububuwefunirubi.pdf In PDF document text
    • http://fsoa.cn/userfiles/file/nexemetineledejekago.pdfIn PDF document text
    • http://learningkey.org/userfiles/48819747075.pdfIn PDF document text
    • http://turskazka.ru/ckfinder/userfiles/files/pidamiseso.pdfIn PDF document text
    • https://footballsod.com/images/ck-uploads/files/57444468624.pdfIn PDF document text
    • https://b2b-intelligence.it/uploads/file/nopamibofizozanumazos.pdfIn PDF document text
    • http://loveperfectionschool.com/upload/file/29182029923.pdfIn PDF document text
    • https://www.profiemg.cz/upload/ck/files/60624574956.pdfIn PDF document text
    • https://vetranhtuongmamnon.vn/wp-content/plugins/super-forms/uploads/php/files/p8vlrka6n8kratmlpimltsk5f2/10102021343.pdfIn PDF document text
    • http://cdkkck.com/uploadfile/file/20210610195245.pdfIn PDF document text
    • http://nfrostov.ru/upload/files/datoxep.pdfIn PDF document text
    • http://rszm88.com/upfolder/e/files/20210604210017.pdfIn PDF document text
    • https://rajakedua.com/contents//files/47402226398.pdfIn PDF document text
    • http://imhkayseri.com/resimler/files/27138145256.pdfIn PDF document text
    • http://adabaskimerkezi.com/upload/file/buzogaleniwoteme.pdfIn PDF document text
    • https://leunamgroup.com/wp-content/plugins/super-forms/uploads/php/files/ea5bf66262b91115bb7be75d2b2ed727/dujuzavazosuliwuti.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085992d4644e---65899040312.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ef806aebaa---disarotosufunikarafaki.pdfIn PDF document text
    • https://activepymes.com/pub/file/gotolixukel.pdfIn PDF document text
    • http://www.liveartsaskatchewan.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608236f3294aa---39454027729.pdfIn PDF document text
    • http://xn--80adpfaaeictf0c6c7i.xn--p1ai/public/file/jakizaju.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=canon+canoscan+lide+25+driver+download+windows+8+64-bitPDF 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_off0000ecef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECEF 11428 bytes
SHA-256: 6fd919f5ea1463099e17537b7eaa4d84662dae1bb6ea9dee8078e9345a1adc82
font_01_sfnt_off00010843.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10843 17924 bytes
SHA-256: a1e8680c1e5c8316d8ec0aa350bd7b31c45a7d335307a77d684aee2c8d255bc5
font_02_sfnt_off000137e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137E7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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