Malicious PDF — malware analysis report

Static analysis result for SHA-256 8384438eb27bd936…

MALICIOUS

PDF

93.0 KB Created: 2021-09-17 09:17:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 6065c56855f8a2059661f0cfd6791771 SHA-1: acbc3ff9e9ae8aa000a053e823d5ecbded51efa9 SHA-256: 8384438eb27bd936043f07701cb61764965ed229786419369f06b64c5bd7b07d
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple compromised websites and potentially disposable hosting, suggesting a phishing or malware distribution scheme. The presence of numerous unknown URLs further supports this, as they likely lead to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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.mediacomriccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613b04ce2a351---20426540290.pdf In PDF document text
    • https://bbox.ru/images/shared/file/pugixowasifabusimilubexi.pdfIn PDF document text
    • http://studiotipaldo.com/userfiles/files/sunokobedologiruvimul.pdfIn PDF document text
    • http://openendrep.com/userfiles/files/46663323916.pdfIn PDF document text
    • http://mackielaw.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/46262445765.pdfIn PDF document text
    • https://giaiphapthietke.vn/media/file/files/netalupitulubalewudevoga.pdfIn PDF document text
    • http://nkmate.com/FileData/ckfinder/files/20210908_6739EEDF7A437468.pdfIn PDF document text
    • https://zoldlepes.hu/userfiles/file/fatejur.pdfIn PDF document text
    • http://lempreintedubois.fr/userfiles/lempreintedubois.fr/file/31595823506.pdfIn PDF document text
    • http://e-motyle.natura2000.pl/imgturysta/files/40452174364.pdfIn PDF document text
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/161342a047bef4---91274738942.pdfIn PDF document text
    • http://seibyou-koujien.com/files/files/19571093855.pdfIn PDF document text
    • http://studiosaletta.it/userfiles/files/rogofemagipagoraludafamop.pdfIn PDF document text
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613e5865a0222---tunutid.pdfIn PDF document text
    • http://khautrangkhangviet.com/upload/img/files/buganered.pdfIn PDF document text
    • https://www.hosotte.com/ckfinder/userfiles/files/pugabafexewipijo.pdfIn PDF document text
    • http://china-zub.ru/userfiles/file/garavevureteno.pdfIn PDF document text
    • https://arerp.kr/data/file///kinuwufojujubisek.pdfIn PDF document text
    • http://fishtech.org/uploads/userfiles/file/file/falepimojogo.pdfIn PDF document text
    • https://volgogradexpo.ru/ckfinder/userfiles/files/41658686888.pdfIn PDF document text
    • http://managhantasala.net/mailuserfiles/file/giparabonijosezumunaz.pdfIn PDF document text
    • http://barbusci.it/maisUserFile/file/wosikufotujunuj.pdfIn PDF document text
    • http://icaalliance.org/filespath/files/20210910004549.pdfIn PDF document text
    • http://architetturaurbanistica.it/userfiles/files/17490574087.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=new+bangla+choti+in+bangla+fontPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d9bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9BF 10552 bytes
SHA-256: 1ee4e2fb770df309a1690317e7a670e26c13cbbf0d2b0cb4a85c5cb74f80d17d
font_01_sfnt_off0000f1cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1CB 16492 bytes
SHA-256: 16a45c2733cd248b60e9463fc2ba9bbd9dec273bdbbf6536f84bfa5f0777c07b
font_02_sfnt_off00010885.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10885 1680 bytes
SHA-256: 6c08887b596ecb472c5a0482df8c2f828d83fc5b5d16111ed0caa1fced1b35dc
font_03_sfnt_off0001107d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1107D 23900 bytes
SHA-256: 00daf3dbf3e8494687eb29e72d330b2504644aa30b9fe2e67b7cc328d432b5ee
font_04_sfnt_off00014bf7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14BF7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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