Malicious PDF — malware analysis report

Static analysis result for SHA-256 e198380aaada8a92…

MALICIOUS

PDF

72.4 KB Created: 2021-09-18 14:05:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: a9b7e0a9244b273e25c7561814d795a0 SHA-1: fda8f07776700deaf50d98a7a6f25b22376b3f04 SHA-256: e198380aaada8a9236325e56ac3045a95da5fe2ce0ba373af1504b85ac9f98a0
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to various domains, many of which are hosted on compromised or disposable infrastructure, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://casalindasbakery.com/ckfinder/userfiles/files/jamifuruta.pdf In PDF document text
    • https://szpital-sulecin.pl/images/fckfiles/file/lebekubofugufekus.pdfIn PDF document text
    • https://needlugs.com/userfiles/files/78008536082.pdfIn PDF document text
    • http://chunmianxian.com/upfolder/e/files/20210902153804.pdfIn PDF document text
    • http://chongqinghaohong.com/upload/files/97697492000.pdfIn PDF document text
    • http://www.stadion-zarya.ru/ckfinder/userfiles/files/kuzibefipevijoruwixu.pdfIn PDF document text
    • http://www.cerel.eu/images/wyswig_images/file/77783215508.pdfIn PDF document text
    • https://masterpieces-mallorca.com/wp-content/plugins/super-forms/uploads/php/files/5b2bddd37f787e7b27b1ce6590fa6980/vaduwubupid.pdfIn PDF document text
    • http://khachsansapa.vn/webroot/img/files/fekara.pdfIn PDF document text
    • http://psychanalyste-gard.fr/ckfinder/userfiles/files/wuxarudin.pdfIn PDF document text
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/16142ec925e528---77149146934.pdfIn PDF document text
    • https://areopag.ru/sites/default/files/uploads/25080859253.pdfIn PDF document text
    • https://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/05d672fa0ba4764a236f149e9a21b8f6/93947362472.pdfIn PDF document text
    • http://safetyassessmentsolutions.co.uk/ckfinder/userfiles/files/85295816857.pdfIn PDF document text
    • https://granitnet.hu/editor_up/93281770334.pdfIn PDF document text
    • http://nomayaku.com/userfiles/file/vafif.pdfIn PDF document text
    • http://qkmedica.com/uploads/userfiles/file/jobasedenivezapo.pdfIn PDF document text
    • http://asupuro.com/user_data/image/file/51531938706.pdfIn PDF document text
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/161413fc4c3026---pupavovar.pdfIn PDF document text
    • https://gagiongvitgiong.com/ckfinder/userfiles/files/12594157777.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613fc47c223d4---91049150078.pdfIn PDF document text
    • http://titusauto.hu/kepek/file/68751273010.pdfIn PDF document text
    • https://cplastik.eu/data/cms/file/rotazivetana.pdfIn PDF document text
    • http://factorycontrolprojects.com/userfiles/file/jumukuli.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=gangstar+vegas+latest+version+apkPDF 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_off0000ba9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA9E 15848 bytes
SHA-256: ac6b41ff1cad7c81238d732021d245872694dd0050da274316205b1578f6f53e
font_01_sfnt_off0000e2d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2D3 10624 bytes
SHA-256: 64f1c97edf2eae836e0d2b1eee70d148c810b19e637fb834f95a1bf25375b2d8
font_02_sfnt_off0000fb56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB56 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1