Malicious PDF — malware analysis report

Static analysis result for SHA-256 6532fff68748c071…

MALICIOUS

PDF

81.4 KB Created: 2021-09-20 03:44:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: eba19ffdfe6c9fdb2072c9a845939812 SHA-1: 31dccded28970c66e571438c03b56aecff4666a1 SHA-256: 6532fff68748c071883e819e9613492e33a4000ecbc95fa435d065afd3f3e765
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The file contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users to malicious content. The document body is heavily obfuscated and unreadable, suggesting it is not intended for human consumption but rather as a container for malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://crysiq.ru/uplcv?utm_term=app+wifi+hacker+pro PDF link annotation
    • http://kotolantopeni.cz/file/72898796321.pdfIn PDF document text
    • https://patoman.ro/ckfinder/userfiles/files/72492703582.pdfIn PDF document text
    • https://fainitelecommunication.com/public/editorfiles/file/40135447562.pdfIn PDF document text
    • https://icrs-as.com/userfiles/file/29485202043.pdfIn PDF document text
    • http://agrobud.net/uploaded/file/96058033249.pdfIn PDF document text
    • http://www.ctmmaximoravenna.com/ckfinder/userfiles/files/845746509.pdfIn PDF document text
    • http://violetstudio.in/userfiles/file/32237275751.pdfIn PDF document text
    • https://cuacuonbentre.com/upload/files/19477543164.pdfIn PDF document text
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/16147b5313f968---porixuji.pdfIn PDF document text
    • http://express-service-auto.fr/ckeditor/ckfinder/userfiles/files/witolires.pdfIn PDF document text
    • https://ssmavidiyar.com/public/content-images/files/bikodudetivirabokitevar.pdfIn PDF document text
    • http://loadcell.vn/Images_upload/files/47189488086.pdfIn PDF document text
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f616e8d8f2---20632946914.pdfIn PDF document text
    • http://tuzoltosagmihald.hu/userfiles/file/52289215686.pdfIn PDF document text
    • https://atlaskvartir.ua/data/uploads/files/lavatewigaluga.pdfIn PDF document text
    • https://pagodatalk.com/_UploadFile/Images/file/metalugojusibotutinuja.pdfIn PDF document text
    • http://architettipassarinmarzotto.com/userfiles/files/piletowigirufabumesepovap.pdfIn PDF document text
    • http://nail-free.com/ckfinder/userfiles/files/jejinamodifavirafigesig.pdfIn PDF document text
    • http://villabrown.it/userfiles/files/19183257867.pdfIn PDF document text
    • http://federicozucchettiarchitetto.eu/userfiles/files/10531675098.pdfIn PDF document text
    • http://ctm.it/userfiles/file/vebenelinojujisetojafiga.pdfIn PDF document text
    • https://rieker-consulting.eu/files/file/75256447202.pdfIn PDF document text
    • http://moscow-vernisage.com/files/files/raxotoxunasumux.pdfIn PDF document text
    • http://mavelikaradiocese.org/rapha/ckfinder/userfiles/files/39465609460.pdfIn PDF document text
    • http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/scudrkm2atm2o3g9nphioq4255/6391405936.pdfIn PDF document text
    • http://aczelzalog.hu/tmp/11938553165.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_off0000d95d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD95D 18044 bytes
SHA-256: f589ec4a29d82644d3a62eaa6c75177f17af733722c8cbf5f60e0c7cb0eeb9ed
font_01_sfnt_off00010828.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10828 10320 bytes
SHA-256: 18647874b711e96fad3d6e0cea064205e27e97c783bfa47783805016e0936f22
font_02_sfnt_off00011faa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FAA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1