Malicious PDF — malware analysis report

Static analysis result for SHA-256 a093b73401818602…

MALICIOUS

PDF

82.0 KB Created: 2021-09-01 13:23:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: f65b5ed6fccc6274a730eb45ba3c03a7 SHA-1: 9dfdd32dc699ca9e57c6df8c00dfc10e8d0e6f0a SHA-256: a093b7340181860233603e024393ac343ae95e437a745b1cf6e1319878ee25d5
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as a phishing trojan and a machine learning model indicated a high probability of maliciousness. It contains numerous links, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to potentially harmful content. The document body is heavily obfuscated and unreadable, providing no direct user-facing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://liftsystems.ro/LiftFiles/file/38103643264.pdf In PDF document text
    • http://www.elitagida.com.tr/wp-content/plugins/super-forms/uploads/php/files/qbun9pd5t1j9b1mp9k6hovicr5/92084460095.pdfIn PDF document text
    • http://edu-family72.ru/content/images/uploads/file/67009577881.pdfIn PDF document text
    • http://knshzj.com/CKEdit/upload/files/tuzatiretupupapatumigagev.pdfIn PDF document text
    • https://ajitcoatings.com/uploads/43041044249.pdfIn PDF document text
    • http://uzks.hr/upload/datoteke/99176335875.pdfIn PDF document text
    • https://irastuff.com/admin/ckfinder/uploads/files/kiwugidabo.pdfIn PDF document text
    • http://fandimnarodaku.cz/upload/file/sasarojeperivogu.pdfIn PDF document text
    • http://www.cddfct.com/up_files/file/66796527939.pdfIn PDF document text
    • http://nordicaluminium.ru/userfiles/file/mijupivida.pdfIn PDF document text
    • https://novamakine.com/upload/ckfinder/files/89989234334.pdfIn PDF document text
    • https://ruxthai.com/ckfinder/userfiles/files/99315847905.pdfIn PDF document text
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/160e9556391906---sugorepisamoseweva.pdfIn PDF document text
    • http://canyonoaksmtg.com/~duckdi5/canyonoaksmtg.com/content/file/18652918055.pdfIn PDF document text
    • http://nuestratierrapremios.com/campannas/file/tobedumugobefutufulu.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/if3ejm4flgfu5juplm529qgjt7/90674535747.pdfIn PDF document text
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a613800fb9d---gitasolatavazetamutowi.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bad22182f6e---bikodok.pdfIn PDF document text
    • http://ibiforstarlight.org/clients/3/3c/3cfcca4e360ca8807b7dd7d6e7cbeae0/File/69946662121.pdfIn PDF document text
    • http://xn--80age2amlc.xn--80adxhks/pics/images/file/xowepigodijadunexosesawir.pdfIn PDF document text
    • http://thamdinhgiadaiquang.com/img/files/37264851872.pdfIn PDF document text
    • http://tradeweb.es/userfiles/file/furumanipejixozokezobibet.pdfIn PDF document text
    • http://tele-klass.ru/i/upload/files/77596173928.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=senators+can+use+a+filibuster+in+order+toPDF 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_off0000ddd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDD3 10784 bytes
SHA-256: 314ab5a5451f76594b8e7390027d32e2d8b479603e3ab03b7e416158dd9d7d8c
font_01_sfnt_off0000f6c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6C2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010ed4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10ED4 16596 bytes
SHA-256: cd6f7b5eaa6c90f3ff243736e33586b0cf1d52a15d8c28546b851674c17a79f1