Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a22c61e42f99ed2…

MALICIOUS

PDF

94.2 KB Created: 2021-08-15 20:57:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 704b79313113a56166f54710f10d1b63 SHA-1: 301f72c002505832b5043e57df0c15905c3ffba6 SHA-256: 3a22c61e42f99ed259a15ff691b22d68314b72b86ed94420cdfeb4a899eebba0
156 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 identified as a phishing trojan. It functions as a link farm, containing numerous URLs that point to websites, some of which are hosted on compromised WordPress installations. The presence of these links suggests an attempt to lure users to malicious sites for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://oniceh.ru/uplcv?utm_term=game+of+thrones+season+7+episode+1+english+subtitles+free+download PDF link annotation
    • https://autoradiator.mn/uploads/ckfinder/files/zadosapekizisubenu.pdfIn PDF document text
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4217e504d2---nipakuze.pdfIn PDF document text
    • http://purepoem.com/resource/docContentImg/file/2021-08-02/72dcb6a622244000ca5f9de144189388.pdfIn PDF document text
    • http://blueyee.com/upload/file/240412403826.pdfIn PDF document text
    • https://jennysbooks.com/wp-content/plugins/super-forms/uploads/php/files/6db0694984ab304a1d5e11147e603a50/28934238546.pdfIn PDF document text
    • http://aaaexpressac.com/userfiles/file/58181179406.pdfIn PDF document text
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/hc3tudr1p23cr08c09l0tp0or3/gikerolezabovarusugatuj.pdfIn PDF document text
    • http://jerilyndavisrobison.com/clients/870655/File/25144843700.pdfIn PDF document text
    • http://msci.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/16100c609c193b---68842784115.pdfIn PDF document text
    • https://citytrafik.nu/images/file/81440181053.pdfIn PDF document text
    • https://quickonboarding.com/wp-content/plugins/super-forms/uploads/php/files/2e757fc0201bf50fc499cc5cab656eab/97875809125.pdfIn PDF document text
    • https://tucsonhomewindowtint.com/wp-content/plugins/super-forms/uploads/php/files/9e9d20dc50e81ea159b13231305d4c4f/tuwasawipufakazafagemewu.pdfIn PDF document text
    • https://pankalconstructora.com/wp-content/plugins/formcraft/file-upload/server/content/files/160888c5162f1d---pusizomedidazuzawobo.pdfIn PDF document text
    • http://pm-ural.com/uploads/files/2134918667.pdfIn PDF document text
    • http://op-gold.com/ck_image//files/mirefijelafasogodo.pdfIn PDF document text
    • https://macleanpinesdrivingschool.com.au/wp-content/plugins/super-forms/uploads/php/files/afccf0f8a1fccd508e30d2420f52614c/pofariketufufawosifus.pdfIn PDF document text
    • https://airflow-skateboards.com/upload/file/xinifumolulibunoririle.pdfIn PDF document text
    • http://greenhousehotel.vn/uploads/image/files/10335260200.pdfIn PDF document text
    • http://materialdeestudo.top/userfiles/files/2096298259.pdfIn PDF document text
    • https://copperscraphandlers.com/ckfinder/userfiles/files/86954847478.pdfIn PDF document text
    • http://mmbc.cz/_data/user_files/file/vanukanivemomaweme.pdfIn PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/160c0787941b9c---67600758177.pdfIn PDF document text
    • http://esistore.be/userfiles/file/felirikanobi.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_off00010a1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A1D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001222f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1222F 17748 bytes
SHA-256: 0452b9eb8e79418fdb2f8f7f5dfd2a018be22590224c2727c9f351c2bc043aef
font_02_sfnt_off00015092.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15092 11412 bytes
SHA-256: 13c03ecd6d968880fd8e27358074e940406889821b11f1fe87e2a4fe729df3e9

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