Malicious PDF — malware analysis report

Static analysis result for SHA-256 4af8ea934be2e0f8…

MALICIOUS

PDF

74.2 KB Created: 2021-09-16 09:05:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 08d687a05d8d9735fbd89d037a0617a4 SHA-1: 327e60a0fc7a4819d0543b24464bd2a641b903a6 SHA-256: 4af8ea934be2e0f858cec71243fd6f3c0ee7cbe9f24d1b051f8e4f1eeaf3323d
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with multiple URLs pointing to potentially compromised websites or disposable hosting. The presence of external URIs and link farms suggests an attempt to redirect users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9827

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://smidgel.ru/uplcv?utm_term=azar+fun+with+grammar PDF link annotation
    • https://www.peeryhotel.com/wp-content/plugins/super-forms/uploads/php/files/9e858e2371a28315607f7f796820af7f/vavakoju.pdfIn PDF document text
    • https://stehovani-ostrava.cz/static_pages_files/file/58557005883.pdfIn PDF document text
    • http://aurangabadptti.com/ckeditor/ckfinder/userfiles/files/wobupaxubugavejal.pdfIn PDF document text
    • http://studiorapizza.it/userfiles/files/29103275259.pdfIn PDF document text
    • http://lamekatus.ee/uploads/ckeditor/files/20285527604.pdfIn PDF document text
    • https://menuiserie-sainte-anne.fr/userfiles/file/jupajaxulutivabotexano.pdfIn PDF document text
    • http://okzawidow.pl/img/upload/files/filot.pdfIn PDF document text
    • http://irinabailey.com/upload/files/29389917293.pdfIn PDF document text
    • http://thankschicken.com/uploads/files/72385537966.pdfIn PDF document text
    • http://mkbeauty.vn/luutru/files/farejoro.pdfIn PDF document text
    • https://www.chinacimctrailer.com/wp-content/plugins/super-forms/uploads/php/files/4e7cfbc56f070cca6c87ae62e99a8d50/mepoviko.pdfIn PDF document text
    • http://norilsk.torbay.ru/images/uploads/file/72779453924.pdfIn PDF document text
    • https://malmospelmanslag.se/userfiles/file/50525001615.pdfIn PDF document text
    • http://kondicionery-vidnoe.ru/upload_picture/file/marepudujefavi.pdfIn PDF document text
    • http://houselandia.ru/files/90723221666.pdfIn PDF document text
    • https://primax.fr/wp-content/plugins/super-forms/uploads/php/files/p8pa9btnvc9846bfv42lmhucd0/5773709774.pdfIn PDF document text
    • http://aiaato.com/FileData/ckfinder/files/20210914_22DA951861C69C52.pdfIn PDF document text
    • http://s2ipower.com/survey/userfiles/files/jozotisivaf.pdfIn PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161395ac9ee521---dowoxokafilarisituji.pdfIn PDF document text
    • http://leadingedgecorporate.com/user_images/file/7179005523.pdfIn PDF document text
    • https://aarushimukhwas.idealviews.com/userfiles/files/30925572155.pdfIn PDF document text
    • https://harmony.im/userfiles/file/zagososigupipag.pdfIn PDF document text
    • http://fanghsin.com/uploads/files/202109030837079557.pdfIn PDF document text
    • http://fujiya-la.com/uploads/files/pejanomupav.pdfIn PDF document text
    • https://sensesgrouphk.com/louis/STARKGROUP/ckfinder/userfiles/files/sorosezuwaxodon.pdfIn PDF document text
    • https://baconbites.com/wp-content/plugins/super-forms/uploads/php/files/ec4e29rlf4o93a60mlrdgrec97/zituxegimibikinemuwe.pdfIn PDF document text
    • https://mediaget.com/userfiles/files/dezatuviwo.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_off0000c00f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC00F 16812 bytes
SHA-256: b1a36a836e9b8370ae5ae2d355e750415c562cf9cd51df2569c7ca2198324897
font_01_sfnt_off0000ebaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBAF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000103c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103C6 10420 bytes
SHA-256: 2713e5337ad4645666f1f86bc86c8d122c0c3153a171c0ccccbc2b2c4f79e697

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