Malicious PDF — malware analysis report

Static analysis result for SHA-256 90633aa10e63bf52…

MALICIOUS

PDF

68.1 KB Created: 2021-09-27 14:36:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: ffbd358d0fbbec9e5c4e381357e727c6 SHA-1: c8995c9cd9e4d68019bd1000889b627b33810391 SHA-256: 90633aa10e63bf5283cb6aa225d3d2e7f0fae80f9f80881421232b9ee692f22d
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file is identified as malicious by ClamAV and a machine learning classifier. Heuristics indicate it's an image-only document designed as a lure, containing numerous links to external sites, some hosted on compromised WordPress uploads. The primary link, 'https://infrive.ru/uplcv?utm_term=how+to+download+thoptv+in+android', suggests a phishing or scam attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 68 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://infrive.ru/uplcv?utm_term=how+to+download+thoptv+in+android PDF link annotation
    • https://voyageaventurenepal.com/upload/files/widizinofuz.pdfIn PDF document text
    • http://elskup.pl/images/assets/file/62580171183.pdfIn PDF document text
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/1614ffdce3f26c---16126038762.pdfIn PDF document text
    • https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/u7ule7eot5t7636978u8g7rh82/mezarodiridizomik.pdfIn PDF document text
    • https://kokomanis.com/contents/files/94292398638.pdfIn PDF document text
    • http://aaaexpressac.com/userfiles/file/rekivigadojalitelu.pdfIn PDF document text
    • http://metall-press.ru/files/gumejerukevatapu.pdfIn PDF document text
    • https://davidfoleyinc.com/userfiles/file/zemenokuxokakajow.pdfIn PDF document text
    • https://divetechmarine.com/contents/files/49822616460.pdfIn PDF document text
    • http://ke-sen.com/userfiles/file/1630909792.pdfIn PDF document text
    • https://viboot.traigiongthuha.com/ckfinder/userfiles/files/17311954405.pdfIn PDF document text
    • https://ojazzdance.fr/userfiles/file/94316860099.pdfIn PDF document text
    • https://kuzeyilac.com/resimler/files/50460266296.pdfIn PDF document text
    • https://signos.larrialdiak.es/files/galeria/files/kodujuzago.pdfIn PDF document text
    • http://boldino-hotel.com/ckfinder/userfiles/files/58138421853.pdfIn PDF document text
    • http://ssp.by/var/upload/33562562590.pdfIn PDF document text
    • https://tommytest.dish1314.com/data/html_editor/files/tolemaxef.pdfIn PDF document text
    • https://nepalihemp.com/ckfinder/userfiles/files/63050101555.pdfIn PDF document text
    • http://njbeihang.com/uploadfile/file///2021090310141763.pdfIn PDF document text
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16145e53e123bc---14858926354.pdfIn PDF document text
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/161328c531df89---xuzavexitakulokojotekurez.pdfIn PDF document text
    • http://asr-net.ru/uploads/files/10688832012.pdfIn PDF document text
    • http://lso-msm.fr/userfiles/file/55189355013.pdfIn PDF document text
    • https://instalacje-elektryczne.net/ckfinder/userfiles/files/85583046947.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_off0000aedf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAEDF 10332 bytes
SHA-256: c6da981909049a338ea4cc11d0dcd28936fd5c9e839e81c16a47eba8ee3dd474
font_01_sfnt_off0000c605.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC605 14324 bytes
SHA-256: 8a5f719bac7c2b6f0aec73d2194f5cd0db9315e30fabfda42b511b2a32a47576
font_02_sfnt_off0000e93d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE93D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1