Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b0d04c0780cda8d…

MALICIOUS

PDF

83.6 KB Created: 2021-09-07 22:20:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: c673f3fdf5f11b944114e1e251e4a83c SHA-1: 68b1d900bfc5e6b822f3b7ad0fd3079513e9e9ac SHA-256: 3b0d04c0780cda8d29b9f4fc59d5524b41292f898840e6b793382cf5ecf36969
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The file contains numerous links pointing to compromised WordPress upload directories and other disposable hosting, indicating a link farm designed to redirect users to malicious content. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9944

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://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086e0ca8f06b---21715629404.pdf In PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/16108cb20600a3---20841628124.pdfIn PDF document text
    • https://unosms.us/userfiles/file/81804388701.pdfIn PDF document text
    • http://olimpic.hu/ckfinder/userfiles/files/vavevale.pdfIn PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/160754471d6138---47474095675.pdfIn PDF document text
    • https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/t38ti3p7c92avp1lbhi8s6ehfl/27468073543.pdfIn PDF document text
    • https://electroagro.es/pub/files/jezapibepari.pdfIn PDF document text
    • https://dezsredstvompx.ru/wp-content/plugins/super-forms/uploads/php/files/b52f2473c4c8b5efaa41e60a4aefdff4/37521053094.pdfIn PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a70c156bc3---kemodebemarukonawaja.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c017a037c38---56174398420.pdfIn PDF document text
    • https://orkhaconstruction.com/wp-content/plugins/super-forms/uploads/php/files/8no2l0o46rc1urudit12me56ks/badasigipuketobigukopek.pdfIn PDF document text
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/16097aebf90822---tedevivesoremagurubu.pdfIn PDF document text
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/414d8df371876ebcc0f237d6e03d121c/buzarebugufaxoreminaj.pdfIn PDF document text
    • http://casaperferiesantamariagoretti.com/writable/public/userfiles/file/81804131272.pdfIn PDF document text
    • http://sskj.pl/userfiles/file/jenerenuk.pdfIn PDF document text
    • http://modnyi-buket.ru/uploads/files/wipufalopidaburosojofo.pdfIn PDF document text
    • http://otvorene-srdce.sk/userfiles/file/kupodalazijaketedidu.pdfIn PDF document text
    • https://grandegroup.net/files/89139683302.pdfIn PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1609165c330ae3---dotisisob.pdfIn PDF document text
    • https://www.cr-sdc.org/wp-content/plugins/super-forms/uploads/php/files/4511e2ea1be1b700c5863f3e8bb766a0/vaguxes.pdfIn PDF document text
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/16092096209c41---kuwurelu.pdfIn PDF document text
    • http://xn--h49al33a2zdp0eo1x.com/DATA/file/20210620140610.pdfIn PDF document text
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/j9ofkh5lue9vr1e8mhac3e28a6/85825856647.pdfIn PDF document text
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/rp8k81pi56be48m4qp43db6mto/66358411842.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=cbse+psychology+book+class+11+pdfPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c2cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2CB 16156 bytes
SHA-256: cb2f4b651abb6d2bd3a1a3fc6793c22b9538271dc7cfe17a5ccbe729fa74d062
font_01_sfnt_off0000d863.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD863 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f07a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF07A 10936 bytes
SHA-256: 986d934ed04263db6d03389f4ce4149f65c39813eda2c7fc3f9c2ea3629a60c1
font_03_sfnt_off000109ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109AB 21024 bytes
SHA-256: f0a70c125459fd2fe3487ce3411ddcc93cfa99bd66b698a8966dd568d6b4e0c4

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