Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d75c1f39e0ca2f3…

MALICIOUS

PDF

86.5 KB Created: 2021-09-18 13:07:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 82754fd84c087511000d323ba0e18178 SHA-1: d7acba25e9985261cc0b4ffd654e97db3fe26f10 SHA-256: 4d75c1f39e0ca2f3ee70efb75d12de96eeb58eee134ae35540afebd342a8edb0
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 external URLs, many hosted on compromised or disposable domains, suggesting a link farm designed to redirect users to potentially harmful content. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this, indicating a tactic to obscure the true destination or leverage compromised infrastructure. While no scripts were explicitly extracted, the PDF structure and embedded URLs strongly suggest a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9930

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://synerhu.ru/uplcv?utm_term=gta+iii+mod+apk PDF link annotation
    • https://terminal.hr/userfiles/file/76678753145.pdfIn PDF document text
    • https://www.harnoordesigns.com/wp-content/plugins/super-forms/uploads/php/files/473663c77c722990ab80c5ef4b26a414/95753699473.pdfIn PDF document text
    • https://lecormier-menuiserie.com/www/upload/files/retupotezazubamonufa.pdfIn PDF document text
    • http://www.neoneofitou.com/ckfinder/userfiles/files/gubelerurenu.pdfIn PDF document text
    • https://zazilha.com.mx/wp-content/plugins/super-forms/uploads/php/files/8f5d0a362dd2f2b4a70abf2ad993326d/xefefuwokamunajamaxinipa.pdfIn PDF document text
    • http://augustaelectricalwork.com/editorData/file/tatanetojijuko.pdfIn PDF document text
    • http://ck-kutnahora.cz/gais/image/file/19743435780.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/26995955042.pdfIn PDF document text
    • https://fetogram.com/images/upload/files/78982446512.pdfIn PDF document text
    • http://abnicum.com/files/file/53810302372.pdfIn PDF document text
    • http://antonio-pelella.eu/userfiles/files/nenoneberekedude.pdfIn PDF document text
    • https://hobbes-group.com/upload/files/zokadaketaturidugudoku.pdfIn PDF document text
    • http://xn----7sbab1bcaqplb0ccyi9d.xn--p1ai/files/file/83668406495.pdfIn PDF document text
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/4b705d18d62778c2eb0a20ff830313f8/30921893020.pdfIn PDF document text
    • https://weldingportal.it/userfiles/file/dokariveliribuzol.pdfIn PDF document text
    • http://kiiga.ru/userfiles/file/jivurikapetebivi.pdfIn PDF document text
    • http://jucal.es/images/file/bujogagovoro.pdfIn PDF document text
    • http://kingsbrite.com/kingsbrite.com/userfiles/file/xotikirokuzugiva.pdfIn PDF document text
    • https://nazrabilisim.com/calisma2/files/uploads/juvorororuvotutaxelis.pdfIn PDF document text
    • https://apgr.eu/UserFiles/file/86112100457.pdfIn PDF document text
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/1613e389642f73---48874212843.pdfIn PDF document text
    • https://marwaautorepair.com/nbloom/fckuploads/file/jisaxarifulagi.pdfIn PDF document text
    • http://www.thaiticketmajor.com/static/imgUpload/files/23428985077.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ddcd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDCD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f5e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5E4 10132 bytes
SHA-256: 0c05be1eb10204f83737a917473f199a32e97be13ba2056fdd521216a7e69ac3
font_02_sfnt_off00010c89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C89 22044 bytes
SHA-256: abe3e4e737fe7e4017f4c6e32f1aa41f928ae0657c1ca5316c87e6f16c448b8f
font_03_sfnt_off000143e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x143E9 1868 bytes
SHA-256: 9d2bb2d94384256bb38bab4c3005c13f44a8b25eb5b232dcefe64ad24aae4b51

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