Malicious PDF — malware analysis report

Static analysis result for SHA-256 f72a76cf47050bcd…

MALICIOUS

PDF

86.7 KB Created: 2021-08-20 12:36:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: ebe2c6c522dc7b1ce220756e8ce0d0a7 SHA-1: fb760bace59cd46caae790c5a8e95f6c7dfd55ff SHA-256: f72a76cf47050bcd5355fe02e4ad1a936e5f1c5ad0a6c4d3c78192fe4f533842
164 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16082ac95884af---24751894940.pdf In PDF document text
    • https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/5c46b82c506d759b68284dbea0f1586c/89774116527.pdfIn PDF document text
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16077501521cf9---navipilasatelumikuzi.pdfIn PDF document text
    • https://www.napariverinn.com/wp-content/plugins/super-forms/uploads/php/files/eeb347fa39725e7010e37c95ed9fe3a6/32713921469.pdfIn PDF document text
    • http://abwessex.com/uploads/files/jumonusexek.pdfIn PDF document text
    • https://qnzar.com/files/kakulimud.pdfIn PDF document text
    • http://xn--42-6kcdlkbomh7beggito5p.xn--p1ai/userfiles/file/58384404719.pdfIn PDF document text
    • http://vetcarefoundation.org/userfiles/file/88254053781.pdfIn PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6c99c1422f---65683583724.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/8e444964e8f9188b3bbce00497e1f4ae/sidenewodipejor.pdfIn PDF document text
    • http://baocaosuhoatoc.com/luutru/files/36622278303.pdfIn PDF document text
    • https://expresstestingatl.com/wp-content/plugins/super-forms/uploads/php/files/f292b15362f7ebe6c61c22b472cf4b25/safolekivodonu.pdfIn PDF document text
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/3fb6c525dfd26d160fd2b8573704f871/6268077098.pdfIn PDF document text
    • https://whiteelephant.co.in/wp-content/plugins/super-forms/uploads/php/files/971edf2eef4d9c7041135779a9a6912d/jobawavesirufizazalugi.pdfIn PDF document text
    • https://cal.lighting/wp-content/plugins/super-forms/uploads/php/files/7efdd39398f4a98a1f24977ea7f9fb59/lejijibipiwagogonasino.pdfIn PDF document text
    • http://naturalmis.com/userfiles/file/vegenuguju.pdfIn PDF document text
    • https://lwim-ouargla.dz/ar/files/vagamorupitebilituxezev.pdfIn PDF document text
    • https://ctsgroups.asia/images/file/muberofaxebovaz.pdfIn PDF document text
    • https://ixiu-23.com/uploads//files/202108090346371618.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac9a522dd81---nanakotusisa.pdfIn PDF document text
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/cb0e3f0aa400c691484505fb904b5351/32967718477.pdfIn PDF document text
    • https://palcev.ru/userfiles/file/93308485496.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b8b2908517---78805655812.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=theri+full+movie+download+in+kuttymoviesPDF 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_off0000ee4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE4C 11040 bytes
SHA-256: 70a77febaf0ee14a67bf3994f87c111990bc80cfbd47cb138e7a2491095f8ea6
font_01_sfnt_off000107e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107E3 16996 bytes
SHA-256: 2a248c31898c96e78244c896956c86fdf7bbe14bf0cf6caeb939a9ed481420a2
font_02_sfnt_off000133e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133E0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1