Malicious PDF — malware analysis report

Static analysis result for SHA-256 9699d3394cf48d30…

MALICIOUS

PDF

82.6 KB Created: 2021-10-13 07:42:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 5160fe018e19d6bdf7f9afa4e97bbfbf SHA-1: df4ea239902fbec54efe731dd98da993c1128693 SHA-256: 9699d3394cf48d30bdc5eb996379895e0c93e4e20d0de86df6326521613ec881
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous external links, many pointing to compromised websites or disposable hosting, indicating a link farm designed to redirect users. ClamAV and ML classifiers strongly indicate malicious intent, specifically phishing or trojan delivery. The presence of multiple PDF link farm heuristics and a high ML score supports this assessment.

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 http://www.rify.us/cms-uploads/files/42674105738.pdf In PDF document text
    • http://abhinavabhishad.org/userfiles/file/natiromupapogekemedoguvab.pdfIn PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/161339ce79f278---difaxivilek.pdfIn PDF document text
    • http://cartopack.com/Images/file/8766172838.pdfIn PDF document text
    • http://studiosiriosrl.it/userfiles/files/virafivedoxazajifejale.pdfIn PDF document text
    • http://xn--e42bt3l.net/upfile/files/22778143469.pdfIn PDF document text
    • http://eclickapps.in/userfiles/files/31351601137.pdfIn PDF document text
    • http://chiangmai-clean.com/user_img/files/69868095952.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615edf49b2e26---fotiko.pdfIn PDF document text
    • https://butagallery.com/userfiles/files/90114917212.pdfIn PDF document text
    • http://home-plast.ru/foto/files/kakilagix.pdfIn PDF document text
    • https://chp-travel.ir/data/file/nesovabojuweroramozaga.pdfIn PDF document text
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613394e4449ef---57362198718.pdfIn PDF document text
    • http://rideco.hu/upload/file/13419316513.pdfIn PDF document text
    • http://news-hk.net/uploadfile/file///41386113938.pdfIn PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615c5d51bda6d---19150548593.pdfIn PDF document text
    • http://tajesink.com/Uploadfiles/files/gajalosakivisefe.pdfIn PDF document text
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613aca71c7d18---67429625893.pdfIn PDF document text
    • http://protok.pro/upload/files/84273588869.pdfIn PDF document text
    • https://www.nitm.ac.in/nitmeghalaya/ckfinder/userfiles/files/70117204503.pdfIn PDF document text
    • http://www.anjhimayath.com/upload/file/teluwirapolinus.pdfIn PDF document text
    • http://cargologicru.com/sadm_files/66575201536.pdfIn PDF document text
    • http://votejoedestefano.com/editorData/file/wigojiju.pdfIn PDF document text
    • https://fereshtegan.net/basefile/fereshtegannet/files/gabudokug.pdfIn PDF document text
    • http://esteticka-stomatologie.cz/files/content/file/39092153821.pdfIn PDF document text
    • https://fultoys.com/userfiles/kasevibodewasofukulif.pdfIn PDF document text
    • http://feedproxy.google.com/~r/Xvkpad/~3/HKUGBsJGI0E/uplcv?utm_term=how+to+convert+cups+to+litersPDF 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_off0000db90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB90 18744 bytes
SHA-256: 9c6bce499a43f6c74601b20d0f60d853e6629a27b8b71103ea04d2cc50ddbdca
font_01_sfnt_off00010c1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C1B 10448 bytes
SHA-256: a0fbca000968813147828adb02d21f3af536d36231a667b0a9655516367741fc
font_02_sfnt_off000123f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123F4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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