Malicious PDF — malware analysis report

Static analysis result for SHA-256 71a6d59c941f8618…

MALICIOUS

PDF

93.9 KB Created: 2021-06-28 06:53:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: c877983a1b83f3a13093ed521eac8d6b SHA-1: 0dd59a2c8c5ef3fe932d5ad8031c8f654dfb9248 SHA-256: 71a6d59c941f861854e14725dbef898bb1159c04e0737ea1a7dbd44fb2607f92
172 Risk Score

Malware Insights

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

The PDF contains numerous links to compromised WordPress sites, many of which host other PDFs. This structure suggests a link farm designed to redirect users to malicious content, likely for phishing or malware distribution. The ClamAV detection and ML classifier strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

Heuristics 8

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://rusiuojigalvoji.lt/wp-content/plugins/formcraft/file-upload/server/content/files/1607c96e6bc91c---52850755568.pdf In PDF document text
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606f58c9cb470---zofetuduloronijogegolu.pdfIn PDF document text
    • https://vuaship.com/wp-content/plugins/super-forms/uploads/php/files/ei7srnsa4jtk55fdkh7s5m3urh/68185379306.pdfIn PDF document text
    • https://www.femregenx.co.za/wp-content/plugins/super-forms/uploads/php/files/dg9rd12ulqtlttsp616ls9ngg1/15179607915.pdfIn PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/1606c8fca0d392---57328409628.pdfIn PDF document text
    • https://stayatrosetta.com/wp-content/plugins/super-forms/uploads/php/files/mi0l35fujjn8p2ev9kt582s4tb/46173535597.pdfIn PDF document text
    • https://alihuata.com/userfiles/file/29394449264.pdfIn PDF document text
    • http://afgventuregroup.com/cfiles/file/kovimutuwiduzutu.pdfIn PDF document text
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b6cf5cd12d---72315922390.pdfIn PDF document text
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/160ac5852a0e40---gagadedufepaxuz.pdfIn PDF document text
    • http://itaindustrial.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607f407e803df---xuzoko.pdfIn PDF document text
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/160d9319515fbf---mapejodijalajajuvutemu.pdfIn PDF document text
    • http://ptk-astana.kz/wp-content/plugins/super-forms/uploads/php/files/f090d0a1ec6d74869712fcf311cafb14/fiwepebusut.pdfIn PDF document text
    • http://scoutpate.com/userfiles/file/97992247856.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b4ef99497dc---wibutukutefadotoxeji.pdfIn PDF document text
    • http://bestbelly.org/content/files/files/gufikaj.pdfIn PDF document text
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160a31721a052e---serogekokibosikigabiwed.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e49832d92d---rinelenimujujafibes.pdfIn PDF document text
    • http://www.asejnrtigers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160817852bab17---33837098305.pdfIn PDF document text
    • https://beribuket.ru/wp-content/plugins/super-forms/uploads/php/files/65795a0509ee7fbb59fe40945d8c0c13/80360704562.pdfIn PDF document text
    • http://inwallendorf.de/userfiles/file/dosejadexefizezigokodajol.pdfIn PDF document text
    • https://maplesservice.com/wp-content/plugins/super-forms/uploads/php/files/a36e62fdab0b441721a6c125de520d17/19810429840.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084dbce779f8---belem.pdfIn PDF document text
    • https://www.lightingsolutionsal.com/wp-content/plugins/super-forms/uploads/php/files/6dcb34c15cd8f03a8e07e06acb28deff/dogapenevinobututapekobes.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=electronic+giving+for+churchesPDF 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_off00010c29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C29 10600 bytes
SHA-256: d0fcfb5e085bc4e53f5ae500e27924fe0e34d614f6c020fba4e60cdb8de8426c
font_01_sfnt_off0001245a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1245A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013c6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C6C 17520 bytes
SHA-256: 531143420db9275201803867ee34136d94ba771137b019bc0bf2a1f704129ab6

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