Malicious PDF — malware analysis report

Static analysis result for SHA-256 bbf5e5cfa5eec211…

MALICIOUS

PDF

80.5 KB Created: 2021-09-12 02:47:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 82124bdf4fb72b2b8954be245e1565ec SHA-1: 6ac0f693e818f861ae0d73919d0bc7e45e44f501 SHA-256: bbf5e5cfa5eec21151fe33b38207f8a10b11dffed3b057e9e471132644ea7e92
156 Risk Score

Malware Insights

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

The PDF file contains numerous links to external websites, many of which are hosted on disposable domains or compromised CMS uploads, indicating a link farm designed for malicious redirection. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a common tactic to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://ardiinerkh.mn/uploads/userfiles/files/fidokuneka.pdf In PDF document text
    • http://asupuro.com/user_data/image/file/janeturezi.pdfIn PDF document text
    • http://batiment-tunisie.com/userfiles/file/mafimasufu.pdfIn PDF document text
    • http://scuolascifondocortinadolomiti.it/userfiles/files/56171068481.pdfIn PDF document text
    • https://szalkasszorutacskok.hu/app/webroot/files/content/files/96102410160.pdfIn PDF document text
    • http://mensagemcrista.com.br/ckfinder/userfiles/files/mikufobozibipusuwogugoped.pdfIn PDF document text
    • http://jysfh.com/upload_fck/file/2021-9-7/20210907121649958686.pdfIn PDF document text
    • http://adaviestransportltd.com/userfiles/file/vosikifetuvemalener.pdfIn PDF document text
    • http://baschin-heizung.de/meineBilderAlbertGrundschule/file/67088441153.pdfIn PDF document text
    • http://khmim.com/ckfinder/userfiles/files/kobabis.pdfIn PDF document text
    • http://ventss.ru/userfiles/files/78292123903.pdfIn PDF document text
    • http://www.norestim.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161348966c9e87---busuveperirumopolalapivo.pdfIn PDF document text
    • https://onutglen.com/caningest/images/file/35247531489.pdfIn PDF document text
    • http://mynigaoe.com/upload/file/20210902062634.pdfIn PDF document text
    • https://kujainspectors.com/candyticket/uploads/page_images/files/23504753841.pdfIn PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16130838eab780---29090697082.pdfIn PDF document text
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/16139aecf9b470---14514006455.pdfIn PDF document text
    • http://meble-tk.pl/userfiles/file/46132154178.pdfIn PDF document text
    • https://szekszardportal.hu/userfiles/file/kuledofezinadawogurinur.pdfIn PDF document text
    • http://hosteleriayvending.com/ckfinder/userfiles/files/12813429013.pdfIn PDF document text
    • http://demenagements-remond.fr/userfiles/file/20210901113755.pdfIn PDF document text
    • http://uforoi.com/app/webroot/uploads/files/xepebo.pdfIn PDF document text
    • https://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1613d352556ae4---83343263353.pdfIn PDF document text
    • https://fertilizerproductionprocess.com/d/files/14055900258.pdfIn PDF document text
    • http://metallpress.ru/files/54309631912.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=my+talking+tom+apk+hackPDF 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_off0000d837.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD837 10620 bytes
SHA-256: f484130125928d1d4453fb81a64c17f0bebef7c4681460559dbd397884073063
font_01_sfnt_off0000f045.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF045 17156 bytes
SHA-256: cb6a61708fcafff335a26382715e1417e33b567aa1e7833c3a9e29d1e6fe8925
font_02_sfnt_off00011cc2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CC2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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