Malicious PDF — malware analysis report

Static analysis result for SHA-256 3959077ab5f0f6ba…

MALICIOUS

PDF

76.7 KB Created: 2021-09-16 00:54:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 6f46422afc919ac2113c4a5e1b2fa2ad SHA-1: 98ddd7dbf92e16bd413570e2155a4d4cac1b9c90 SHA-256: 3959077ab5f0f6bacf3d410783c987a80cd1b62d7299af6ceae5a96b0521fda8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The document contains numerous embedded URLs that point to compromised WordPress sites and other disposable hosting, suggesting it functions as a link farm. The presence of 'utm_term' parameters in some URLs indicates a potential phishing or credential harvesting attempt, aiming to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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://laborke.ru/uplcv?utm_term=enable+usb+debugging+mode+on+android PDF link annotation
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1614268e6b2888---44861317904.pdfIn PDF document text
    • http://livestocktool.com/d/files/xelizojovogilazi.pdfIn PDF document text
    • http://cbstav.cz/file/pasibufes.pdfIn PDF document text
    • http://terralis.eu/catalogue_dynamique/file/80895007493.pdfIn PDF document text
    • http://naturalfurnish.com/userfiles/file/30315001807.pdfIn PDF document text
    • http://xn--80aaaaaikdebj9ccf1ayja1b5a3q.xn--p1ai/ckfinder/userfiles/files/32735234491.pdfIn PDF document text
    • http://vwtint.com/userData/board/file/59628571678.pdfIn PDF document text
    • https://mimpishio1.com/contents/files/famapipilatasofufim.pdfIn PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134cdb3d5659---41028000099.pdfIn PDF document text
    • https://datatech-int.com/userfiles/file/94016348689.pdfIn PDF document text
    • http://myflora888.com/ck_files/files/zumup.pdfIn PDF document text
    • http://progettogeometra.it/userfiles/files/85113266777.pdfIn PDF document text
    • https://cebubigsellers.com/userfiles/file/mesogesepopopabonovol.pdfIn PDF document text
    • http://tuanayapim.com/rsm/files/18525187766.pdfIn PDF document text
    • https://rowanmkt.com/Uploads/ckfinder/userfiles/files/19734664573.pdfIn PDF document text
    • https://mvpartners.be/images/uploadedimages/file/falexasawekewofazap.pdfIn PDF document text
    • http://vasset.bg/userfiles/file/newakiwagulisojigikatuviv.pdfIn PDF document text
    • https://dmshospital.com/mm_engg/files/66960901835.pdfIn PDF document text
    • http://dsverano.com/UserFiles/File/22301939268.pdfIn PDF document text
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/161377fa0edf86---28280045528.pdfIn PDF document text
    • http://cityclick.it/userfiles/files/30776710892.pdfIn PDF document text
    • http://ppfi-online.com/userfiles/file/87124088187.pdfIn PDF document text
    • http://aranysolyomfeszke.hu/editor_up/mipaluriwu.pdfIn PDF document text
    • http://daglichtfilters.nl/ckfinder/userfiles/files/merilefavuxavudoxowiwa.pdfIn PDF document text
    • http://studiorapizza.it/userfiles/files/devavufip.pdfIn PDF document text
    • http://srmtteaparty.com/uploads/files/202109080908394233.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_off0000c899.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC899 16972 bytes
SHA-256: da3f344028b9c9c8934f40b9931a65d6437cfa9bf20610b98d68dad319fd8b22
font_01_sfnt_off0000f483.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF483 10716 bytes
SHA-256: 77d2f583b0ccdb01a229103f7223bda3f927b822f24f84958934dfd83edd679f
font_02_sfnt_off00010ccc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CCC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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