Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab970a4aacc075fb…

MALICIOUS

PDF

84.6 KB Created: 2021-08-15 15:13:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 42a00c59db93c4ba6c39ae3711e2779e SHA-1: cf3ceab135dc3d0976a98d037060fe52181577bf SHA-256: ab970a4aacc075fb97d93635459617cfdfd1e2e6b64a5acd12809c45062f7d4c
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs that point to compromised websites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of these links and the overall structure strongly suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

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://huntic.ru/uplcv?utm_term=ave+maria+bach+piano+and+violin+sheet+music PDF link annotation
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/7d49c6978f10c5e790bf1100238be153/57258726903.pdfIn PDF document text
    • http://pauseforserenity.com/clients/1/10/1002a5d8b3740fc7390aa1937d1ec3ed/File/rusufasitakakefijifobob.pdfIn PDF document text
    • https://anyimaker.com/upload/users/files/79357365851.pdfIn PDF document text
    • http://eltonltd.ru/sites/default/files/uploads/90304120902.pdfIn PDF document text
    • http://sicilyontable.it/userfiles/files/nafatarodatajubarogozowal.pdfIn PDF document text
    • https://fellowpeo.com/wp-content/plugins/super-forms/uploads/php/files/7ea43082b67dd0ebc2c43bc8937bf1dc/9593203384.pdfIn PDF document text
    • https://www.dolphinrfid.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080200bd71e1---jatedopalaranoviwu.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/160a204b5c5e00---48910044503.pdfIn PDF document text
    • https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/6bag8v9edv6i58g7o9ekqvata4/59012572487.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/d0s45jkjpta6nolehjblqno9e6/25443923694.pdfIn PDF document text
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/160790b45c3c30---83708202440.pdfIn PDF document text
    • https://bonacorsi.it/file/86410470911.pdfIn PDF document text
    • http://phunggia.biz/userfiles/file/vunoviro.pdfIn PDF document text
    • http://rolmech-strzelno.pl/Upload/file/vetirorobezedikosepa.pdfIn PDF document text
    • http://c2mag.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608eef48ed321---wupipemuje.pdfIn PDF document text
    • https://sellerflows.com/wp-content/plugins/super-forms/uploads/php/files/4aed74a988d6e40fd599181394454f96/94927613853.pdfIn PDF document text
    • http://casaalu.com/luutru/files/64066957811.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608419ae5dc73---polajirunavuduwudalitamuz.pdfIn PDF document text
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/8ca382610174bc593d13263135ae5247/wivizipitegix.pdfIn PDF document text
    • https://fatheragneliti.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e2e36f3666---84101326002.pdfIn PDF document text
    • http://31kouqiang.com/userfiles/file/1625026348.pdfIn PDF document text
    • http://rowsontw.com/shopadmin/upload/files/gozezutakuwilabalamupu.pdfIn PDF document text
    • http://photographybynami.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c18dcee3cbc---bozexeje.pdfIn PDF document text
    • http://dcbestwings.com/uploads/files/72841296454.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_off0000e52d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE52D 17192 bytes
SHA-256: c4a7b0ee689e965800c22645c2ce11f0b8836ae0af9e622a375dfc1a25478c8f
font_01_sfnt_off00011248.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11248 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012a5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A5F 11068 bytes
SHA-256: 590146847e38433f84dfb2d658d6ec2a2ab759eb86654f17f91bb067c25bb280

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