Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c29c095c96347ba…

MALICIOUS

PDF

87.8 KB Created: 2021-07-15 09:59:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 16ee58c40ce5e25d929d13dd31bec60e SHA-1: e388d2f43793dd984ca646ee20ecabbe9a26e817 SHA-256: 3c29c095c96347bafae4068fb0f122108171d8da966aa37948a17a449ad95e40
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier, with heuristics indicating a malformed exploit stream and a link farm pointing to compromised WordPress upload storage. The document body is heavily obfuscated, but the presence of numerous URLs hosted on compromised sites suggests a phishing or malware distribution campaign. No scripts were extracted, but the PDF structure itself is indicative of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • 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://suemsas.com/wp-content/plugins/super-forms/uploads/php/files/putddlk6gvc8caa8bq6bqbbm83/9473887845.pdf In PDF document text
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/5c6b00a6a6cf119def657280fe88a479/64253243995.pdfIn PDF document text
    • http://penoplex24.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609df06ec1db0---wulemugisizevofokunuge.pdfIn PDF document text
    • http://angelojrobles.com/admin_initial_test/userfiles/file/56319071991.pdfIn PDF document text
    • http://lotusromeo.fr/app/webroot/files/userfiles/files/mezaburujizowavosu.pdfIn PDF document text
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/babjk6252cmkqdvljo3m96df4p/luguw.pdfIn PDF document text
    • https://jclifeschools.org/wp-content/plugins/super-forms/uploads/php/files/d5a933d49cb31cb5ac4c8b26da35b524/vevuzek.pdfIn PDF document text
    • http://bubblesoflove.net/wp-content/plugins/formcraft/file-upload/server/content/files/160abb6aa38bc8---lefobaz.pdfIn PDF document text
    • http://huiking.cn/uploads/file/021358188947.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/97708ec1e0cd244cc17f12412246173c/36764942167.pdfIn PDF document text
    • http://rc-modeller.se/images/file///6542361775.pdfIn PDF document text
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/160853c8735df0---74835225839.pdfIn PDF document text
    • https://specialbrands.gr/wp-content/plugins/super-forms/uploads/php/files/8c519a820941db04b4fe88ec3d5f7ea4/29000969953.pdfIn PDF document text
    • https://urbanlivin.lu/userfiles/files/94376004127.pdfIn PDF document text
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608005864bbf6---99634197483.pdfIn PDF document text
    • http://noithattamphuong.com/upload/files/zelivorawel.pdfIn PDF document text
    • http://sva-jeanroze.com/xmedia/file/febesezumatawura.pdfIn PDF document text
    • https://pensiuneavalentina.ro/app/webroot/file/ruduxufidutejubavu.pdfIn PDF document text
    • http://www.k-24.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608cbb765eb98---sovosifodufegunovavudu.pdfIn PDF document text
    • https://legacydockandmarine.com/wp-content/plugins/super-forms/uploads/php/files/0a16442500bf667e4c5b9c910bd5e1a4/8115518926.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=how+to+unshrink+a+jumperPDF 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_off0000f644.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF644 16632 bytes
SHA-256: 1186d0c723fd4262b53752c13d2733436a39d9e384c7f312fab283455bb346c5
font_01_sfnt_off00012161.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12161 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013978.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13978 10872 bytes
SHA-256: e258145cb50a870694ff382c380773dfbbf4a8d0bc9bee1033f43e9063c03b9c

Open this report in the interactive analyzer, or submit your own file for analysis.