Malicious PDF — malware analysis report

Static analysis result for SHA-256 962a2f358abd0746…

MALICIOUS

PDF

88.7 KB Created: 2021-08-31 10:11:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 7ffbcf4592ab2e03e9f3c7a04b6d5540 SHA-1: 156600d87c182c39ae27bb4855ff2993ef8e3aa3 SHA-256: 962a2f358abd074613b805d9d5321c117267e13940d28b3c68d4d8dca7e8af51
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains a link farm pointing to multiple compromised websites and disposable hosting, suggesting an attempt to distribute further malicious content or conduct phishing. Although no scripts were explicitly extracted, the nature of the link farm and the PDF format itself often implies the use of embedded JavaScript for redirection or exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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 http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4e9c6e7aa3---76759753557.pdf In PDF document text
    • https://nanyangtextile.com/userfiles/file/54358591425.pdfIn PDF document text
    • https://gagiongvitgiong.com/ckfinder/userfiles/files/tebowavubamibisolosuw.pdfIn PDF document text
    • https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/698b9fede5d9b2c640737ed864dd0b3e/perefafirizovifiwesomi.pdfIn PDF document text
    • https://dhcom.vn/userfiles/file/kivaxedodanejevepoxiveva.pdfIn PDF document text
    • https://eurocomm-italia.com/file/95893492408.pdfIn PDF document text
    • https://bhiringisamsankalimandir.org/ckfinder/userfiles/files/75923142160.pdfIn PDF document text
    • https://qamarapps.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611824f946628---76564282034.pdfIn PDF document text
    • http://autoklej.pl/app/webroot/media/files/sopavuworatutejenoda.pdfIn PDF document text
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/16077a9be8e5f0---paviwibefaziluzuzof.pdfIn PDF document text
    • http://leebyenghun.com/new/upload/board/files/dufiluburagatebov.pdfIn PDF document text
    • https://canvasations.com/wp-content/plugins/super-forms/uploads/php/files/o5vt8qfgoadbd4hja1b24asen5/8733115214.pdfIn PDF document text
    • http://skup-laptopow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c35cfa565a1---xezubidepuxuwapafop.pdfIn PDF document text
    • http://finpacecuador.com/userfiles/file/19275268867.pdfIn PDF document text
    • https://www.waterlooarmsnewforest.co.uk/wp-content/plugins/super-forms/uploads/php/files/c590833521a1d6f43f4e8591700d11a0/33681857756.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/16095d190c6b22---4533967068.pdfIn PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa081470108---zuzuzus.pdfIn PDF document text
    • http://net-marketing.hu/images/files/jawapalazekasagixodalizil.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa5cb7d4171---10992612007.pdfIn PDF document text
    • http://world-green-hope.com/uploads/files/59960411234.pdfIn PDF document text
    • http://antonellascarpittadesigner.it/userfiles/files/pesixuwebaxodusowazekuvik.pdfIn PDF document text
    • http://mineraux-et-lithotherapie.fr/ckeditor/upload/files/besewapoj.pdfIn PDF document text
    • http://brandnewgoods.net/userfiles/file/nebizej.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=residential+building+section+drawingPDF 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_off0000f09d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF09D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000108b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108B4 10916 bytes
SHA-256: bcec32528c828ea50ac48ada0d209b5f8f3eb9aa6879a9291b80dc5a2cb18eae
font_02_sfnt_off000121f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121F6 19168 bytes
SHA-256: a3ba9944a7d0830713864b4f025aca6760df1f6475b34565bb7981f0b02c3838