Malicious PDF — malware analysis report

Static analysis result for SHA-256 16b07a4035a297c7…

MALICIOUS

PDF

78.2 KB Created: 2021-09-23 21:46:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: f1f6a66a4292f063de0827531a8391bb SHA-1: f086c8a813b367069edf03e15930832066c4acaa SHA-256: 16b07a4035a297c72e846b387ff75c28d4f6708a2dbd3ed502c60f49da2fb21d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a link farm. It contains numerous URLs pointing to compromised websites, which in turn host further PDF files. This suggests a multi-stage attack designed to obscure the ultimate malicious destination and potentially distribute phishing content or malware. No scripts were extracted, but the PDF structure and URL patterns are indicative of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://medvor.ru/uplcv?utm_term=does+note+9+get+android+11 PDF link annotation
    • http://immobilieninvestors.eu/userfiles/file/dunowotofikobudomuda.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/e956d2392a3a5a56424faf1f72a2e329/wovewa.pdfIn PDF document text
    • https://maftplayer.net/calisma2/files/uploads/39291963980.pdfIn PDF document text
    • https://condicionamentofisico.com/arquivos/file/tikevizodis.pdfIn PDF document text
    • http://grandioso.asia/editor_upload_image/file/42387149434.pdfIn PDF document text
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136c8ad9de87---23580103502.pdfIn PDF document text
    • https://promenade-perpignan.com/userfiles/file/63072271871.pdfIn PDF document text
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/a80da8c174dc77ceea223c8679e2a1db/lawijevupoxefobibo.pdfIn PDF document text
    • http://prospekt-rostov.ru/ckfinder/userfiles/files/gafesidajo.pdfIn PDF document text
    • http://www.multigacos.com/admin/uploaded/fck/file/94000971750.pdfIn PDF document text
    • http://gokea.org/upload/editor/files/31150811904.pdfIn PDF document text
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/1612fa9a0b792e---lafaxijanagidonipoveraru.pdfIn PDF document text
    • http://tuvanthanhlapcongty.biz/upload/ck/files/fidibepibesuzovijipa.pdfIn PDF document text
    • http://shimamura-mail-order.com/userfiles/file/34186576438.pdfIn PDF document text
    • https://fmpride.com/wp-content/plugins/super-forms/uploads/php/files/1e0c1d0a5430c3447bd661ffd6cbc1e1/katirevaxodejixunefo.pdfIn PDF document text
    • http://avtokit116.ru/!upload/files/lipetidopesijurakoze.pdfIn PDF document text
    • http://lussoleathertiles.com/test4/EDITOR/example/v2/userfiles/file/37390008657.pdfIn PDF document text
    • http://jevades.com/aircraft/fckimages/file/nizedurapibogaxoweron.pdfIn PDF document text
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cf8bc40556---29561565063.pdfIn PDF document text
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16141fd772bd69---82308873978.pdfIn PDF document text
    • http://industra.sk/userfiles/file/basidifebafilafiga.pdfIn PDF document text
    • http://alpha-th.com/userfiles/file/83243154616.pdfIn PDF document text
    • https://rieker-consulting.eu/files/file/87446048549.pdfIn PDF document text
    • http://pegasomeeting.medcoast.net/ckfinder/userfiles/files/neduxo.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/10b7561122262917007604cfa2480152/79143643598.pdfIn PDF document text
    • http://multi-accueil.fr/ressource/site-image/files/77890323802.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_off0000cda7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDA7 10596 bytes
SHA-256: ea45b3aec0bff1e403124166c7c516e035b601a5c4691cd3bb2e4f639247b523
font_01_sfnt_off0000e5dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5DC 17552 bytes
SHA-256: 0a0272c441b4f456211efeb720d5c68bda7bbf8ad16d28e1bb28a6afdfe4c977
font_02_sfnt_off00011320.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11320 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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