Malicious PDF — malware analysis report

Static analysis result for SHA-256 e36eeb4f8fa4d2c7…

MALICIOUS

PDF

70.4 KB Created: 2021-09-17 19:49:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: e85686a98c66abd1ea47179164d817ef SHA-1: 697ad07137d0fe98eca5bd4586f28fbc14478539 SHA-256: e36eeb4f8fa4d2c744714386f28bb940fdf94afae7ecf5a4c77d1b22b0f82c77
156 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It functions as a link farm, presenting numerous URLs that point to potentially compromised or disposable hosting sites. The primary purpose appears to be directing users to external, untrusted resources, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 6

  • 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.
  • 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://cualuoiskydoor.com/webroot/img/files/70524195062.pdf In PDF document text
    • http://www.jindatunnel.com/up_files/file/65058038832.pdfIn PDF document text
    • https://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/026862490ef17e1dd34b27b146390467/posoturazijolupixil.pdfIn PDF document text
    • http://mjacz.cz/soubory/files/nezazovokivabemago.pdfIn PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134c7d909358---losupewexowisolavix.pdfIn PDF document text
    • http://hangquangauto.com/files/tadumatezad.pdfIn PDF document text
    • http://c2mag.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132fef9b9ddb---16769133696.pdfIn PDF document text
    • http://uceng.net/_UploadFile/Images/file/konatubajinawub.pdfIn PDF document text
    • http://emanuelmlevin.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/62397520341.pdfIn PDF document text
    • http://hoachattn.com/image/files/35209686777.pdfIn PDF document text
    • http://saothienemb.com/uploads/images/files/taxare.pdfIn PDF document text
    • http://fotografiafrancescosomma.com/userfiles/files/91893696454.pdfIn PDF document text
    • http://costanzolegal.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/jexigumegenuzebosejami.pdfIn PDF document text
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/a35d7bb19e165860a72f58efad51bcad/30662262600.pdfIn PDF document text
    • http://yournamebadges.com/withyourdog/cms_uploads/file/paniwemeviwanipiman.pdfIn PDF document text
    • http://etabetasurvey.com/userfiles/files/fexazanunuzomuzedomaza.pdfIn PDF document text
    • http://studioarchperissinotto.eu/userfiles/files/36132568788.pdfIn PDF document text
    • http://www.lircai.com/web/inline/file/87426367441.pdfIn PDF document text
    • http://haciogullari.com/depo/sayfaresim/file/1780839382.pdfIn PDF document text
    • http://benthanhsgfarm.com/images/uploads/files/30341548155.pdfIn PDF document text
    • http://support-cmu.com/filedata/file/90307983319.pdfIn PDF document text
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613524ca01418---73102176922.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=flutter+build+debug+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_off0000b5e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB5E1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cdf8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDF8 10484 bytes
SHA-256: fd1a2fcea2034802b69d675b111b2bd445cfab2323320063f94a0063d79880cb
font_02_sfnt_off0000e569.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE569 15396 bytes
SHA-256: ef45df093e31d2ce79c8500decb8c7086863da494ee3bb0dd086e2359277e284