Malicious PDF — malware analysis report

Static analysis result for SHA-256 a897ba6202661420…

MALICIOUS

PDF

136.5 KB Created: 2021-07-02 05:45:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: e42a4aca7c2b4f772e926305e9797c93 SHA-1: 54f51599f1be8419ca180602634a8f57892bc8d2 SHA-256: a897ba6202661420c74ef6956b283fafdf3731a700eaa301bfdf37f18a325e90
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier with high confidence. It contains numerous links to external websites, many of which are hosted on compromised WordPress sites or disposable domains, suggesting a link farm or phishing lure. The document body is heavily obfuscated, preventing a clear understanding of its specific content, but the overall structure and URL analysis indicate a malicious intent to redirect users to potentially harmful sites.

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://atolab.it/wp-content/plugins/super-forms/uploads/php/files/34027b40c71ecb680d2ffa1f68acfc72/3033050704.pdf In PDF document text
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c89c7656785---75357806593.pdfIn PDF document text
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1608c7e361138a---mumikinedimililinapedi.pdfIn PDF document text
    • https://alibabaoman.com/basefile/alibabaomancom/files/733149051.pdfIn PDF document text
    • http://xn--e1aazeoc7d.xn--p1ai/images/shared/file/linoradomuwogesejotag.pdfIn PDF document text
    • http://www.misshandicap.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160bfd66321cb7---20904749223.pdfIn PDF document text
    • http://highlandhighclassof1962.com/clients/c/c3/c330a44b04b080977bf299ea430a317d/File/judubevegexofug.pdfIn PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b436a8c898---72101868459.pdfIn PDF document text
    • https://nowbali.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/160909c944d7c7---zinizefipej.pdfIn PDF document text
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cc6bb2ddcc---82246362857.pdfIn PDF document text
    • http://garmagostaran.com/Upload/file/jagujositelozejutiwat.pdfIn PDF document text
    • https://globalclassic.org/wp-content/plugins/super-forms/uploads/php/files/0e1pqqkdomtvjrdsjp2ienns14/52879946382.pdfIn PDF document text
    • https://www.ciabrini-immobilier.com/wp-content/plugins/super-forms/uploads/php/files/01phpma45kgfpl14j9tc9m6ikn/5650229369.pdfIn PDF document text
    • http://theettiaresmontreal.com/clients/f/f0/f03dfc1790708d0b03c48e9879ef2ea6/File/jagelitulizobi.pdfIn PDF document text
    • https://cor.org.ar/wp-content/plugins/super-forms/uploads/php/files/5dghmugdlp839diko6t0u78v6e/dapogebuvopi.pdfIn PDF document text
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160bae0e062003---7002938141.pdfIn PDF document text
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1609af70f2cf2e---mapowarenafijotoj.pdfIn PDF document text
    • http://henghuitong.com/jingkelun/userfiles/files/20210616234849.pdfIn PDF document text
    • https://k2salight.com/wp-content/plugins/super-forms/uploads/php/files/8a558dbd1cb67530d63de11394cab30e/zonatebozemukusonuzarik.pdfIn PDF document text
    • https://transpack-krumbach.de/_upload_bilder/_filemanager/file/guwowi.pdfIn PDF document text
    • http://www.zaluziemalina.cz/userfiles/file/56670719341.pdfIn PDF document text
    • https://globalmediaminds.com/uploads/files/20421051091.pdfIn PDF document text
    • http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bc59a08c6f---82690083877.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160cdb5a16b25d---kudixiberevofuz.pdfIn PDF document text
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160beaf48d923b---guwotagurimutur.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=letter+of+intent+sample+for+school+pdfPDF 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_off0001b42e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B42E 10844 bytes
SHA-256: d7416124dee656829afd4bcb7b7a4ed12664907ae27b5a8144ec41bdf5c62068
font_01_sfnt_off0001ccf8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1CCF8 17940 bytes
SHA-256: 58fee19c2d2a8283efa681115746eb3988b687afe8ebcb3175b471b4c216766d
font_02_sfnt_off0001fbe0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1FBE0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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