Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a3b7d827d3953d1…

MALICIOUS

PDF

80.1 KB Created: 2021-10-09 09:24:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: f5930fe92cf0bf5b2920734f046e58ff SHA-1: b184d1123eb42e458a2d620bd2eeb7a3225af2ef SHA-256: 7a3b7d827d3953d12b7dc363813f001e05d0bed8a63d647257b42a0a6a7d5b61
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many of which point to compromised CMS upload directories or disposable hosting, suggesting an attempt to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent. No scripts were extracted, but the structure and URL analysis point to a link farm used for malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 http://vrieshorst.nl/images/uploads/file/tegiredejazedurapirapo.pdf In PDF document text
    • https://pasarant0g3l-turbo-h1t.com/contents/files/63315274467.pdfIn PDF document text
    • http://adance0112.com/upfile/editor/file/lakaxor.pdfIn PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614b856197b32---fivojexorusa.pdfIn PDF document text
    • https://anbuadidravidarmatrimony.com/ckfinder/userfiles/files/xesumebin.pdfIn PDF document text
    • http://mail.teleserviciomalaga.com/ckfinder/userfiles/files/83717620170.pdfIn PDF document text
    • http://ylpcl.com/ckfinder/userfiles/files/xipikegatat.pdfIn PDF document text
    • https://ist-lb1.istanajp.com/contents/files/difetatujimopinusu.pdfIn PDF document text
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/16160f6627e9e4---mudowijigusewaje.pdfIn PDF document text
    • http://hacoauto.vn/upload/files/guxare.pdfIn PDF document text
    • http://hidropro.hu/upload/93698201802.pdfIn PDF document text
    • http://sprinter-lab.ru/content/File/25414567831.pdfIn PDF document text
    • http://akkoryazilim.com/userfiles/file/39750668602.pdfIn PDF document text
    • http://irinaburmistrova.ru/files/43389117331.pdfIn PDF document text
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1614368b88e608---94514008306.pdfIn PDF document text
    • http://zaragozalawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/31180372539.pdfIn PDF document text
    • https://www.ibyservice.com/wp-content/plugins/super-forms/uploads/php/files/50a4ef848b86b6027f810afc29bfd612/selilijifiwitajulolem.pdfIn PDF document text
    • https://stmarys-perthamboy.com/upload/File/totokazaxanatimuvajoradi.pdfIn PDF document text
    • http://farmaciafici.com/userfiles/files/dadijisojafalusafumasob.pdfIn PDF document text
    • http://stalmont.eu/userfiles/file/lisimedoki.pdfIn PDF document text
    • http://tehpromyar.ru/media/file/xozufexobupakukin.pdfIn PDF document text
    • https://likeevent.it/writable/public/userfiles/file/75660329388.pdfIn PDF document text
    • https://educhina.mn/editor/files/91556241912.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=how+many+bottled+waters+is+2+litersPDF 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_off0000d354.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD354 17700 bytes
SHA-256: 1e58a150b7ff6c2f92aa172c2d7097c001f6e5c2c3807cc295e1ffa178a07205
font_01_sfnt_off00010118.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10118 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001192f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1192F 10860 bytes
SHA-256: 02dd3a035b972ba79c24f09d2809816cb7b290dafd859f0a0018dd4ab02b510f

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