Malicious PDF — malware analysis report

Static analysis result for SHA-256 098b010e193633c8…

MALICIOUS

PDF

69.5 KB Created: 2021-09-27 21:49:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: f74989079253d8e646eb2d8b37f6fdc9 SHA-1: 4aa6261af36971c70363caac37220d08357c6260 SHA-256: 098b010e193633c8314933d6591f41126658264e054bd7101a7f526492f33556
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains numerous external URIs and is structured as a link farm, directing users to potentially compromised websites. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM firings indicates a deliberate attempt to obscure the final malicious destination through a series of redirects and potentially compromised hosting. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://philabc.ru/uplcv?utm_term=minari+movie+streaming PDF link annotation
    • http://gps-tw.com/CKEdit/upload/files/22301254010.pdfIn PDF document text
    • https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/218051c4316783a85f17fdedd5c2df97/70446866823.pdfIn PDF document text
    • http://thuexedanang247.com/uploads/image/files/35156230387.pdfIn PDF document text
    • http://cheliabinsk.realxenon.ru/uploads/files/nuxorigozirodamukedod.pdfIn PDF document text
    • http://aldobini.it/userfiles/files/81464791314.pdfIn PDF document text
    • http://colafranceschi.it/userfiles/files/52307416328.pdfIn PDF document text
    • https://doctmcooper.com/userfiles/files/bugeliti.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/161362fb7aaba0---90448268446.pdfIn PDF document text
    • http://tangiahoang.vn/Images_upload/files/27591202979.pdfIn PDF document text
    • https://estduquebec.com/scripts/php/xenocode/lib/ckfinder/userfiles/files/xizatenugu.pdfIn PDF document text
    • http://xn----7sbbbizu2bxaod.xn--p1ai/userfiles/file/24975387839.pdfIn PDF document text
    • http://hstechno.com/userData/ebizro_board/file/veninofapevakovajukelizex.pdfIn PDF document text
    • http://nusratali.com/userfiles/files/munafidudotiropipi.pdfIn PDF document text
    • https://orig-shop-gsm.ro/ckfinder/userfiles/files/fadozoselopig.pdfIn PDF document text
    • https://dynasty888.com/image/files/20210919_024609.pdfIn PDF document text
    • https://liho.cz/UserFiles/File/34130060435.pdfIn PDF document text
    • http://thuocnam.xyz/images/files/pomavixok.pdfIn PDF document text
    • http://hypovyhody.sk/res/file/18492826840.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/9921695442.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136daf2b6126---55470546398.pdfIn PDF document text
    • http://fuzoku-kyujin.jp/ckfinder/userfiles/files/18354724930.pdfIn PDF document text
    • http://bafiti.com/sklep/userfiles/file/99159132879.pdfIn PDF document text
    • http://okfilm.kr/userData/board/file/57249947145.pdfIn PDF document text
    • https://odlingfamily.com/userfiles/file/zatipetuwikuwim.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_off0000b2c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2C9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cadb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCADB 14812 bytes
SHA-256: feb39bf02eee92add82189f7ea50fa027a3224f01fa741697f44ffa911b00a3a
font_02_sfnt_off0000f03a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF03A 10464 bytes
SHA-256: 7951998c948287c0bb964489b72d555fbdfa7e4b4b1094251b503c76fd924e1a

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