Malicious PDF — malware analysis report

Static analysis result for SHA-256 729a68f24c6903f8…

MALICIOUS

PDF

87.8 KB Created: 2021-10-25 20:03:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 2c57564c8c712b92ab5ec78b38749bed SHA-1: bb2ef25059584413ac69584a9066bba95cbeb590 SHA-256: 729a68f24c6903f8a55b5d985282c7f57aaf9bbb9086412eb352848ba8807f82
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable hosting, suggesting a link farm or phishing lure. The presence of embedded URLs and the nature of the heuristics point towards an attack pattern involving directing users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 6

  • 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 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://catamma.ru/uplcv?utm_term=my+cat+never+meows PDF link annotation
    • https://basundharamart.com/userfiles/file/ginokuvawaz.pdfIn PDF document text
    • http://mtt-association.fr/upload/file/3197249660.pdfIn PDF document text
    • http://areawifi.com/DESARROLLO/userfiles/files/73494068376.pdfIn PDF document text
    • http://www.dereformasenalicante.com/archivos/files/69282541178.pdfIn PDF document text
    • http://ivankotov.ru/img/lib/file/32765152724.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/16150ee83b93f9---powopofomutujitotug.pdfIn PDF document text
    • https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/27bn275icdsagqeb085p52ba85/dajevuxonavinexisunovi.pdfIn PDF document text
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/c5d992b5bc36d3aac9c5d2d62fc75c54/valikipevimemizijemebib.pdfIn PDF document text
    • https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/16158802ccef57---wumitomonu.pdfIn PDF document text
    • http://studionegro.net/userfiles/files/wezolazamafore.pdfIn PDF document text
    • http://ltptech.vn/uploads/userfiles/file/55040255066.pdfIn PDF document text
    • https://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/6oddpa0oph73k0p567er015pdc/tutokoseduzuzukolo.pdfIn PDF document text
    • https://legyenegyjonapod.hu/userfiles/files/xetinavosakatapak.pdfIn PDF document text
    • http://hrdiborice.cz/erucom1/files/files/dodupuxolawudovig.pdfIn PDF document text
    • http://rrmkaryacollege.org/rrmkarya/userfiles/file/39312279162.pdfIn PDF document text
    • http://motolargo.pl/userfiles/file/jopemasopovamoro.pdfIn PDF document text
    • https://rzfmuhasebe.com/userfiles/file/mijatob.pdfIn PDF document text
    • http://lcs.edistrict.net/ckfinder/userfiles/files/dasorovonuzibusig.pdfIn PDF document text
    • http://mingmitrcoffee.com/user_img/files/xazovuxom.pdfIn PDF document text
    • http://ghalemdi.com/userfiles/file/nutitifoxibipezik.pdfIn PDF document text
    • https://tucsonhomewindowtint.com/wp-content/plugins/super-forms/uploads/php/files/4f70184af939b8f26cee86589d2800ab/14303357922.pdfIn PDF document text
    • http://mdsalon.ru/img/lib/file/87845763314.pdfIn PDF document text
    • https://gemwares.iceleajewel.com/userfiles/file/73992394227.pdfIn PDF document text
    • https://galaxy-training.com/userfiles/file/zarixewuxudatirujusom.pdfIn PDF document text
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/1614923114a776---22522900909.pdfIn PDF document text
    • 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_off0000f388.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF388 10512 bytes
SHA-256: 9983264c012cdcf22382cce0f9413f42f39c0e0cd2cc75928ca96a22c90809c7
font_01_sfnt_off00010b91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B91 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000123a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123A3 18056 bytes
SHA-256: ea84b7fd181f879ec49736b13743c1e06e2ad7c663e90f74b27d99179ecffb6b

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