Malicious PDF — malware analysis report

Static analysis result for SHA-256 61fe2962c9544cee…

MALICIOUS

PDF

82.3 KB Created: 2021-09-16 21:55:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: b9d4f0fcabaaa09c1aa7bd723299c01e SHA-1: 74e9707e105d187ff14aefcc7b118c0d862fe1a4 SHA-256: 61fe2962c9544ceed7fd6b642242dca68edb31cef09a97c5f2eed453eabb4ee9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It functions as a link farm, with numerous URLs pointing to external sites, some of which are hosted on compromised WordPress installations. The presence of external URIs and link farm heuristics indicates an attempt to redirect users to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://allytemp.ru/uplcv?utm_term=can+you+recover+permanently+deleted+videos+on+android PDF link annotation
    • https://uleshuzataruhaz.hu/files/file/loboletatazinovog.pdfIn PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1613db02df27f1---79834055579.pdfIn PDF document text
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d8780076c2---18649223659.pdfIn PDF document text
    • http://hzzxtl.com/UploadFile/file/20210911233501560.pdfIn PDF document text
    • http://thessalonikiflights.com/files/files/56402368061.pdfIn PDF document text
    • https://emenu.hu/editor_up/17806955619.pdfIn PDF document text
    • http://schubert-hh.de/image/file/44348239375.pdfIn PDF document text
    • http://deaprogettazioni.it/userfiles/files/bofupudelosebojun.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/ce154h2plbumg8gpo0frg4ndbq/jabozigubenofed.pdfIn PDF document text
    • https://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/41dd693aac12b31ca2018434cfbda131/29289020949.pdfIn PDF document text
    • http://www.rpv-drachten.nl/files/file/zibukafoj.pdfIn PDF document text
    • https://techlan.pl/files/file/98956703226.pdfIn PDF document text
    • http://baugeraeteverleih.de/benutzerdateien/wuverin.pdfIn PDF document text
    • http://mgrima.com/files/file/kekuk.pdfIn PDF document text
    • http://naviway.su/upload/files/gosojuvipoxobawiguvama.pdfIn PDF document text
    • https://butchercurnow.com/img/shop/contents/17141069264.pdfIn PDF document text
    • https://laughteronlineuniversity.com/images/upload/files/zimugutubisozex.pdfIn PDF document text
    • http://cbafjvn.com/uploads/userfiles/file/xazomutinafosuferexub.pdfIn PDF document text
    • https://www.koreayokogawa.com/ckfinder/userfiles/files/16089006189.pdfIn PDF document text
    • https://lesartsdansmonjardin.com/userfiles/file/20210902145254.pdfIn PDF document text
    • http://ct-tci.com/cttax/userfiles/files/fiwefi.pdfIn PDF document text
    • https://spvi.cn/filespath/files/20210907095845.pdfIn PDF document text
    • http://wadirumshootingstars.com/userfiles/file///vogebafi.pdfIn PDF document text
    • http://geodez.com/pliki/file/pukowuzoralitudi.pdfIn PDF document text
    • https://grdr.org/paidel/ckfinder/userfiles/files/wagure.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_off0000dc3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC3F 10984 bytes
SHA-256: 892b0a8256693a98ef4bb34d90120b078abc333287c5fa32f5642b94da9b75e9
font_01_sfnt_off0000f5cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5CB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010ddd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DDD 17536 bytes
SHA-256: b5167e1a515d9116a97237a8444aac43ff048ad5e51bb18739341d0de75fd84f

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