Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf3ffa8a51020d81…

MALICIOUS

PDF

81.0 KB Created: 2021-10-13 00:20:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: a590dc5df669e10ecba1c07f903e691d SHA-1: 454d45aabba5839f759f398872a52a3c68d0da24 SHA-256: bf3ffa8a51020d819f5a5c4498a49ba4ca28fcf9149ffc099bd9c91d320e2843
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, with multiple heuristics indicating it functions as a link farm pointing to compromised WordPress uploads and disposable hosting. The embedded URLs, such as http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/7f7bf6665c219b48cd92f1601df4d729/73560322582.pdf, are likely used to distribute further malicious content or phish for credentials. No scripts were extracted, but the structure and URL patterns strongly suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://ominocoibaffi.it/userfiles/files/26888923342.pdf In PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/vghc2cu1hudf3663kp2r3qfbo5/16384315817.pdfIn PDF document text
    • http://latiendasegura.com/contable_prueba/userfiles/file/10488699135.pdfIn PDF document text
    • http://helderlive.nl/ckfinder/userfiles/files/53843955858.pdfIn PDF document text
    • http://wingmanplanningdemo.com/userfiles/files/refilobizetudozono.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145c4a7937c2---43064695003.pdfIn PDF document text
    • http://chothuexehochiminh.com/userfiles/file/1167302038.pdfIn PDF document text
    • http://ballarioarchitetti.eu/userfiles/files/86708052900.pdfIn PDF document text
    • https://firsathosting.com/calisma2/files/uploads/44979377453.pdfIn PDF document text
    • https://frenstravel.com/assets/ckfinder/userfiles/files/nimuwufefiledeki.pdfIn PDF document text
    • http://www.cenlajobinator.com/siteuploads/editorimg/file/59440848161.pdfIn PDF document text
    • https://luxartparquet.com/wp-content/plugins/super-forms/uploads/php/files/842846778a0eecfc3fc265d1d3b5fd74/81757882583.pdfIn PDF document text
    • http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/7f7bf6665c219b48cd92f1601df4d729/73560322582.pdfIn PDF document text
    • https://griffithnorthsideapartments.com/ckfinder/userfiles/files/44633865891.pdfIn PDF document text
    • http://belean.pl/userfiles/file/sepotuna.pdfIn PDF document text
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/161603a2ae7819---48919838928.pdfIn PDF document text
    • https://www.hkha.org/ckfinder/userfiles/files/donufufadurokuposeleved.pdfIn PDF document text
    • http://hasicimosnov.cz/foto/Image/file/kuwofasewikikuzinab.pdfIn PDF document text
    • https://www.parquesanalbertohurtado.cl/ckfinder/userfiles/files/wapawekejuxawikawepuvapi.pdfIn PDF document text
    • http://muszempilla.com/files/file/buwegeje.pdfIn PDF document text
    • https://wentworthre.com/wp-content/plugins/super-forms/uploads/php/files/4c31daa8e2fd656cf9a426faff84ba1f/jaletagoxomi.pdfIn PDF document text
    • http://op-gold.com/ck_image/files/kovarewenigugukimivifegul.pdfIn PDF document text
    • https://www.willmarshelter.com/ckfinder/userfiles/files/mitotibegepexuve.pdfIn PDF document text
    • http://cpviettin.com/upload/files/wulikezilotasoda.pdfIn PDF document text
    • http://carszana.com/image/upload/File/11833740500.pdfIn PDF document text
    • http://feedproxy.google.com/~r/Xvkpad/~3/HTGXzuRVGb4/uplcv?utm_term=real+life+situation+using+one+to+one+functionPDF 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_off0000d4c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4C7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ecde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECDE 10556 bytes
SHA-256: 187bced937ae29e1ff096f2bb81352a80d2582f9caf631364bc40f1f9b84ed44
font_02_sfnt_off00010516.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10516 18772 bytes
SHA-256: 8e3a44304ce53857cc7df4831527e9c084094d9f63bcdc9fecaf0c7dd838510d

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