Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b770e403ccd95d6…

MALICIOUS

PDF

81.4 KB Created: 2021-09-19 00:29:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: b18e1c4e971e59664c85459c160dae05 SHA-1: cbfec05d7b8cc783fb4348c96255487d2011df02 SHA-256: 9b770e403ccd95d616bfc49d9948e12ebc9c46ff502124fbb01138847907a42d
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous links to external PDF files, many of which are hosted on compromised websites or disposable domains. The presence of a PDF_RANDOM_URL_LINK heuristic and ML_NYX_PDF_MALICIOUS classification strongly suggests malicious intent, likely to distribute further malware or phishing content. The embedded JavaScript, while not fully analyzed due to obfuscation, is a common vector for exploitation in PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 8

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://flygarfield.net/userfiles/file/71238677947.pdf In PDF document text
    • http://www.synagoge-stommeln.de/ckfinder/userfiles/files/48783916747.pdfIn PDF document text
    • http://ambulatorioveterinariocigliano.com/userfiles/files/wapugiwakuronokalume.pdfIn PDF document text
    • https://sieuthimayphat.com/ckfinder/userfiles/files/62216626460.pdfIn PDF document text
    • http://alltechsro.cz/files/23017740185.pdfIn PDF document text
    • https://www.frontiermea.com/sites/all/libraries/ckfinder/userfiles/files/1738532031.pdfIn PDF document text
    • https://sgotomotiv.org/upload/files/9623897308.pdfIn PDF document text
    • http://tomei4x4.jp/js/upload/files/wivamuzo.pdfIn PDF document text
    • http://drsrkbedcollege.com/ckeditor/ckfinder/userfiles/files/10120855501.pdfIn PDF document text
    • https://avflash.nl/upload/files/vomerakatidozotomowobivi.pdfIn PDF document text
    • https://thebottombillion.org/business_school/uploads/file/xiforu.pdfIn PDF document text
    • http://planet-for-events.de/userfiles/file/12264328910.pdfIn PDF document text
    • http://elektrostroy.kz/ckfinder/userfiles/files/16125898217.pdfIn PDF document text
    • http://31kouqiang.com/userfiles/file/1630930539.pdfIn PDF document text
    • https://finliz.lt/i/File/34674613232.pdfIn PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/1612fb870da424---togozatadotixodirone.pdfIn PDF document text
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/161365bc3d3075---latadojaporixowixuxesoxor.pdfIn PDF document text
    • http://dotacjedlaoze.pl/userfiles/file/19575459583.pdfIn PDF document text
    • http://retco.ge/ckfinder/userfiles/files/gutokav.pdfIn PDF document text
    • https://tssch.in/tssch/application/admin/uploads/file/tasegekipikexukowibebolew.pdfIn PDF document text
    • https://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/69aad32402ccc1fd903bdbd17890213a/29185505737.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=blackmod+market+appPDF 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_off0000da4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA4C 10456 bytes
SHA-256: a502dfe8519f9e2b4bf882301446a1a76e224c0cbdc82b3e388bb32fcb13a0a6
font_01_sfnt_off0000f21d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF21D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010a2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A2F 17420 bytes
SHA-256: 94de460baebb09bba4654c350f98b00834b9c354236034b7c20b6984b6aa765a

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