Malicious PDF — malware analysis report

Static analysis result for SHA-256 eab33bf08653d2ae…

MALICIOUS

PDF

73.5 KB Created: 2021-09-08 05:03:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 63ba6fe16688fff1e0f74bc7e39671d2 SHA-1: 21133a8cc50c77a4492de66b5c3f292572d7f1a9 SHA-256: eab33bf08653d2ae498643207a7d998dbad25913489324a534a8da5302eb88d7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and an ML classifier. 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 attempt. The document body is heavily obfuscated and unreadable, but the presence of multiple PDF link farm heuristics indicates an attempt to redirect users to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://www.nordatec.com/wp-content/plugins/super-forms/uploads/php/files/2eisqdpq1qo60fsht5a1ifnon2/zilosajapapigajabek.pdf In PDF document text
    • http://palyavalaszto.hu/teszt/upload/file/sutovodo.pdfIn PDF document text
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a6221d776b---24383828344.pdfIn PDF document text
    • http://volamtuyetthe.com/userfiles/file/54316946070.pdfIn PDF document text
    • http://fujavietnam.com/images/Download/fowewiwivepi.pdfIn PDF document text
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607f22d5f001b---pefelojo.pdfIn PDF document text
    • https://www.mysmilestudios.com/wp-content/plugins/super-forms/uploads/php/files/cfb5b03f6537ea4e2d78f8188df53b6b/wokoxumapuputopev.pdfIn PDF document text
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a869d69969---lurubavij.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/72759fecfcbea881b352ee9f182430a4/37510370991.pdfIn PDF document text
    • http://takeacode.com/user/d41d8cd98f00b204e9800998ecf8427e/file/nujufegenemawu.pdfIn PDF document text
    • https://maintogelonline2.org/contents/files/nikufoximejilujawo.pdfIn PDF document text
    • https://www.nvsrolko.org/ckfinder/userfiles/files/fagerosexoli.pdfIn PDF document text
    • http://rafaelokazakov.com/file/2545663760.pdfIn PDF document text
    • http://keitbg.com/images/files/nazowavuv.pdfIn PDF document text
    • https://arihantgranites.in/wp-content/plugins/super-forms/uploads/php/files/a76cc7bce6bd69081bc5a086f7d558a9/gopukuti.pdfIn PDF document text
    • http://www.laterveer-biesenbeek.nl/ckfinder/userfiles/files/65050598973.pdfIn PDF document text
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608be3b7abc64---24204064584.pdfIn PDF document text
    • https://roofmed.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160790bd8ec21a---molarozimotiguwatupodi.pdfIn PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096902f446cd---vutadiniritaxenebimupu.pdfIn PDF document text
    • https://portugaliaimagyarok.com/ckfinder/userfiles/files/jolinebozamanufakoverixe.pdfIn PDF document text
    • https://web-sila.ru/wp-content/plugins/super-forms/uploads/php/files/145b575f88fa261ff8fd4766289e5d93/45172540489.pdfIn PDF document text
    • http://hrdiborice.cz/erucom1/files/files/limolabu.pdfIn PDF document text
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/o4qo8ss5mnc7d21rtn7tcie94k/15566084319.pdfIn PDF document text
    • https://lecapsuledigian.it/file/89794973799.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=nissan+silvia+s15+service+manual+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_off0000b86b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB86B 18368 bytes
SHA-256: cdce786bde4c7fc1e95c02b4310de5f35d72a0ee68b0cf41a4e5af59eac1a6cb
font_01_sfnt_off0000e6a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6A0 10892 bytes
SHA-256: b62466c86dcdf9705b4f6cbcf1688ace27a6d2f896f49649e7644c98ea692c7f
font_02_sfnt_off0000ffe5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFE5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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