Malicious PDF — malware analysis report

Static analysis result for SHA-256 d494fb60dcbfef6a…

MALICIOUS

PDF

83.3 KB Created: 2021-09-13 02:29:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: b0f025c2236c77943d8e0cb15ab67ced SHA-1: 13329ba66da1c6a86330b746c95c1a173c023760 SHA-256: d494fb60dcbfef6afb72530627ca9d955d0196dfa70554e3446cacd18e355244
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The sample is a PDF file flagged by ClamAV as a phishing trojan. It contains numerous links to external websites, many of which are hosted on compromised CMS uploads or disposable domains, suggesting a phishing or malware distribution scheme. The presence of embedded URLs and the ML classifier's high confidence score indicate a malicious intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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=iq+test+for+class+8+pdf PDF link annotation
    • http://wwsm-us.com/files/file/nuwojikerisexafuxidokita.pdfIn PDF document text
    • http://tandartsindex.nl/images/uploads/81389802123.pdfIn PDF document text
    • http://babyshelter.net/assets/upload/files/45510794183.pdfIn PDF document text
    • http://bcslaw.hu/admin/fck_upload/file/mekobefofedivojafabo.pdfIn PDF document text
    • http://svx.su/ffile/file/gozunizowizulakerakikaten.pdfIn PDF document text
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bd56c368f8---72256448175.pdfIn PDF document text
    • http://centroolosprato.it/userfiles/files/8683825512.pdfIn PDF document text
    • https://tatvan.in/userfiles/file/ginaru.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131b9cb91530---wemixotugadiw.pdfIn PDF document text
    • http://puzynowska-kancelaria.com/userfiles/file/71205386813.pdfIn PDF document text
    • http://mynigaoe.com/upload/file/20210902041006.pdfIn PDF document text
    • https://www.emcp-pmce.ca/_includes/ckfinder/userfiles/files/39395662014.pdfIn PDF document text
    • https://muratay.nl/userfiles/file/84049169024.pdfIn PDF document text
    • http://smolensk-bakaleya.ru/userfiles/file/41323098359.pdfIn PDF document text
    • http://gnatowski.pl/attachments/file/45223084091.pdfIn PDF document text
    • http://chapraptti.org/userfiles/file/busodur.pdfIn PDF document text
    • http://okuninka-biale.pl/userfiles/file/mepapipekufamupavokom.pdfIn PDF document text
    • http://birdwatching.sk/media/file/94002562382.pdfIn PDF document text
    • https://dailyiat.com/html_upload/file/48151879419.pdfIn PDF document text
    • http://paraglider24.de/pics/fotos/1/file/18252600519.pdfIn PDF document text
    • https://ozanetiket.com/TasarimAcarnet/serhali/upload/files/rejab.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1612fc47f453cc---87152090365.pdfIn PDF document text
    • http://hitmet.slektenkaas.com/bilder/file/21828092700.pdfIn PDF document text
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/16138fb88413c7---nikajevulajetasero.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_off0000e023.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE023 10724 bytes
SHA-256: f63d97d270bed4d2d32a7be018151599009d44f32585865a40af60e8c6380426
font_01_sfnt_off0000f8bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8BC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000110ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110CE 18376 bytes
SHA-256: ec44a3ca784807b8fadebee1556accfc334f62160f7caae58d91039a96e25b60