Malicious PDF — malware analysis report

Static analysis result for SHA-256 135027a300e654f4…

MALICIOUS

PDF

82.9 KB Created: 2021-09-04 01:10:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 5f2f659db80009dde771901500c95fe5 SHA-1: 11d0c164d729ca8b8a8aafe3f549d3b12bd9767c SHA-256: 135027a300e654f46ec84930c1025cf50c8cdf3d2ca52f63709d1f7ce4762fed
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to multiple compromised CMS upload locations, suggesting it's used to distribute further malicious content or phish users. The presence of numerous distinct hosts and URLs, many hosted on compromised WordPress sites, reinforces this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://eliteswimmingpoolsinc.com/wp-content/plugins/super-forms/uploads/php/files/e74tgpfh75fmc4c5lvqs3se8u1/54377836307.pdf In PDF document text
    • http://www.playerclub.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1611941052e0cc---34035573783.pdfIn PDF document text
    • http://fmafirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/85569863088.pdfIn PDF document text
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/b5e813e230b4fe145dd4203f12366791/daruvobeg.pdfIn PDF document text
    • https://uppersanduskyrotary.com/cms/files/File/28591661231.pdfIn PDF document text
    • http://highendschmiede.de/highendfiles/file/92299634846.pdfIn PDF document text
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/160c02b3e7bd11---vaxezoporuposajetemu.pdfIn PDF document text
    • http://hoondb.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071c12b0c8d9---745544229.pdfIn PDF document text
    • https://www.lorenzofranzone.it/wp-content/plugins/super-forms/uploads/php/files/f1c34c802a43f830419a7349c33a9954/wuvimemekewe.pdfIn PDF document text
    • http://etoprosto.ru/ckfinder/userfiles/files/fugafaligopugesuv.pdfIn PDF document text
    • http://tafgambiatours.com/userfiles/file/64038909014.pdfIn PDF document text
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c178b2cd539---xuxazemajara.pdfIn PDF document text
    • https://berettyotv.hu/userfiles/files/pomabamoditino.pdfIn PDF document text
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079016b1a908---51816046806.pdfIn PDF document text
    • https://tycoonmarine.com/userfiles/files/38043491529.pdfIn PDF document text
    • https://esperanzadeavila.com/fotos/file/80113843277.pdfIn PDF document text
    • https://hanurichurch.org/ckfinder/userfiles/files/48114192063.pdfIn PDF document text
    • https://jaurrieta.net/USERFILES_JAURRIETA/files/75077440774.pdfIn PDF document text
    • http://armanetti.com/images/15721999118.pdfIn PDF document text
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095762d21470---tisakebaviruti.pdfIn PDF document text
    • https://tradingphrases.net/userfiles/files/14999468466.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/161181530a9aaf---serelijutiwivarob.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=algorithms+by+robert+sedgewick+and+kevin+wayne+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_off0000dc41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC41 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f458.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF458 11548 bytes
SHA-256: 850f5e18224f6127c2de96f5b5e8ffb0308c905430901921b9fa6f1ee00be6e2
font_02_sfnt_off00010f40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F40 17964 bytes
SHA-256: 233a2c11bf036390f2e9276ad687fccca8345f69c1f779ae805a7011e4ba9d5e

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