Malicious PDF — malware analysis report

Static analysis result for SHA-256 bcd818ff83ea4cd7…

MALICIOUS

PDF

80.2 KB Created: 2021-09-05 04:13:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 44607201cea9ab7b66afdb0435ac6476 SHA-1: 4490b8ad0fbcdd86517f828206bc1ec7aaceb605 SHA-256: bcd818ff83ea4cd72844b361beef12b4dc916dfede3e693d7697253ead328b07
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URIs and is identified as a link farm, suggesting it's designed to redirect users to potentially harmful websites. The presence of a 'download button' heuristic further supports a lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://ketchas.ru/uplcv?utm_term=fit+furs+goethe+zertifikat+a2+pdf+free+download PDF link annotation
    • http://joltiy.ru/uploads/files/50840155942.pdfIn PDF document text
    • https://best-label.com/upload/files/nunuxe.pdfIn PDF document text
    • http://mobilenmr.com/files/files/39164644617.pdfIn PDF document text
    • http://boxerdapolenta.com/cmsimple/images/file/88537598747.pdfIn PDF document text
    • https://www.engltg.com/wp-content/plugins/super-forms/uploads/php/files/7348e23c3f7663d65ed9c487a52d9a5e/jagerodanoxutuxu.pdfIn PDF document text
    • http://bigredclassof1960.com/clients/879476/File/riduvopamatenevevuwiw.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606f751ece55b---7576952616.pdfIn PDF document text
    • http://maulich.vn/attachment/files/67379034868.pdfIn PDF document text
    • http://xn--djr00fsyfv0o5qgy9u.com/filespath/files/20210801033224.pdfIn PDF document text
    • http://carszana.com/image/upload/File/45135123489.pdfIn PDF document text
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160c4d636282fc---17608747963.pdfIn PDF document text
    • https://hylyt.co/wp-content/plugins/super-forms/uploads/php/files/e4edf8d3677c8f7363fe387980cf830e/90796861445.pdfIn PDF document text
    • https://euroroma-bg.org/files/file/28508887408.pdfIn PDF document text
    • http://fiumaradelsossio.it/userfiles/files/raxofagidovemusepogemuwi.pdfIn PDF document text
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/160c8f1426a621---jidijogo.pdfIn PDF document text
    • https://theemperorsoldclothes.co.uk/wp-content/plugins/super-forms/uploads/php/files/79om44uvfka5or6i9u13imikel/8056920911.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/s82ih67troilunl3l7b47r8h7f/pavabu.pdfIn PDF document text
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095abad1fff3---50588827528.pdfIn PDF document text
    • http://www.motionmantra.com/userfiles/files/vikiwerubatavodiruzazali.pdfIn PDF document text
    • https://seger.cz/userfiles/file/78980498845.pdfIn PDF document text
    • http://10glazsikeyrosa.ru/file/44587217296.pdfIn PDF document text
    • https://yellowstonewildlife.com/38638850243.pdfIn PDF document text
    • http://hotararicedo.ro/files/files/vupudumag.pdfIn PDF document text
    • http://eichler-kammerer.de/mekirezumojelugokenav.pdfIn PDF document text
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/16089071dc71ea---mogijerodani.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_off0000d14c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD14C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e95e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE95E 18196 bytes
SHA-256: 10e5d39902f32ed6fb4300d7170ff9e880534e86652b0c824f6803228ec08669
font_02_sfnt_off000118cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118CB 11212 bytes
SHA-256: 4d093a30c38cb639cd43097454ff1e487db4cc964bcfd5b732c49825ffa62d3d

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