Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc43cd9f1853c471…

MALICIOUS

PDF

82.6 KB Created: 2021-07-01 12:18:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 1e9fb652ed7244241bbb207278317042 SHA-1: 0f61288a713f635a28fc2a6e5ce0ffab13513fef SHA-256: cc43cd9f1853c4710cc0a6a67d12ce1b461460f504dc795de5a08de16602e45b
156 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs that point to compromised WordPress installations and disposable hosting domains, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://pixomot.ru/uplcv?utm_term=automatic+tapping+auto+clicker PDF link annotation
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/a63b4828ad7afd414ad49cfc3ba3476e/tigodokiposaleluzowemilog.pdfIn PDF document text
    • http://mirrorgallery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160da03af88ac9---vijatirejejepuxurixodavip.pdfIn PDF document text
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/f5e7229d8da2ecec66a9f4e21b824a58/bibuzonevezasovok.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070bdca11613---70292174208.pdfIn PDF document text
    • http://cunningham-reunion.com/clients/7/73/7399477c88ef979e1ad3ac38e42cffcc/File/95602434937.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/16087723e0f8d9---81057755537.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160788f337714b---88289585496.pdfIn PDF document text
    • https://chokysitohang.com/Uploads/userfiles/files/27951411570.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/abb859b401aae589cef67da16562fe24/mosigowa.pdfIn PDF document text
    • https://tamtam.com.ua/wp-content/plugins/super-forms/uploads/php/files/071799ee04d7b1132d426bff89d8ffb4/dewegominidorarawefojon.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fadacbb60a---96356444766.pdfIn PDF document text
    • https://www.chinacimctrailer.com/wp-content/plugins/super-forms/uploads/php/files/f4cf5787a33491175f71a757b134ef19/3898451156.pdfIn PDF document text
    • https://argentinaproduct.com/ckfinder/userfiles/files/xowadugamagubezonuza.pdfIn PDF document text
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160be0789e9727---zufopifig.pdfIn PDF document text
    • http://joyearland.com/ckfinder/userfiles/files/35300814954.pdfIn PDF document text
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/160832651bb125---50723160324.pdfIn PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dbab1175ec7---26075621184.pdfIn PDF document text
    • http://hanarotalk.com/userfiles/file///basugivozafunokige.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16084dcc5de3a2---bixamiraporov.pdfIn PDF document text
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b55af620a33---77585517240.pdfIn PDF document text
    • http://kapli74.ru/upload_picture/godoxufijawepitizimedino.pdfIn PDF document text
    • https://vaytieudungtragop.com.vn/wp-content/plugins/super-forms/uploads/php/files/v8qa44ve2nq13egakhouovuhrd/nakuboxikutididakezarexo.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_off0000e04a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE04A 10720 bytes
SHA-256: cd0fae64933b821ec35cccbb06dd63dd71d7f829f40f5974eedb9a3ed124dc81
font_01_sfnt_off0000f8ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8EC 17000 bytes
SHA-256: 7b8935322cca48e3ec92443305d0e20d76644911d4927b56dab2fd8ad0b7de7d
font_02_sfnt_off00012546.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12546 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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