Malicious PDF — malware analysis report

Static analysis result for SHA-256 9055ca8f8f4871ab…

MALICIOUS

PDF

84.2 KB Created: 2021-09-20 09:47:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 55dab5fe7251e4b6c7fe94cfbd4408e2 SHA-1: 08c82501f0661825b722c381156e7bcdf97e5eb0 SHA-256: 9055ca8f8f4871abad8e3354a4281d5c78531ccc9c97ea565262a50d27f78aeb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on disposable domains or compromised WordPress installations, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://infrive.ru/uplcv?utm_term=all+i+want+to+do+is+grow+old+with+you PDF link annotation
    • http://marathon-gexin.com/Uploadfiles/files/zoxenujo.pdfIn PDF document text
    • http://thermogroup.ru/uploads/files/xufimuxawofulomewufirener.pdfIn PDF document text
    • http://analhospital.net/file/files/80147376883.pdfIn PDF document text
    • https://gonguyenkhoi.vn/upload/files/98353266738.pdfIn PDF document text
    • https://www.igescanada.com/ckfinder/userfiles/files/najal.pdfIn PDF document text
    • http://hifitness.hu/userfiles/file/87590873117.pdfIn PDF document text
    • http://kemnhapkhau.com/upload/files/1240152021.pdfIn PDF document text
    • http://tydafa.com/dafa/uploadfiles/20210919122520.pdfIn PDF document text
    • http://chandravanshi.com/userfiles/file/80739846852.pdfIn PDF document text
    • http://taiwan-casters.com/userfiles/file/40881697406.pdfIn PDF document text
    • https://rivieresoceanie.com/ckfinder/userfiles/files/xosetipegad.pdfIn PDF document text
    • https://itchanoi.vn/uploads/news_file/gasitoje.pdfIn PDF document text
    • http://swaptoys.org/ckeditor/uploads/files/81568215278.pdfIn PDF document text
    • http://sreema.org/FCKeditor/file/ruxigexutafi.pdfIn PDF document text
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cb10526374---zapaxosapenefuvaximidije.pdfIn PDF document text
    • http://bckbytow.naszbip.pl/img/upload/files/rujigenevugomanobub.pdfIn PDF document text
    • http://les-dvorik.ru/userfiles/file/88281787204.pdfIn PDF document text
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/0p3oaba5dsnpi1uccpp7vvb7m1/56402655552.pdfIn PDF document text
    • https://defrokatilai.lt/images/files/33469401638.pdfIn PDF document text
    • http://baruraprotidin.com/assets/ckfinder/core/connector/php/uploads/files/gamariviwudakapuf.pdfIn PDF document text
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/16146ed014c012---jogiregigepuri.pdfIn PDF document text
    • https://f1com.ge/wp-content/plugins/super-forms/uploads/php/files/4b2b22e5033900aa39a2c3ff4d8099e4/bemokimalodavoxafogakaba.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_off0000e251.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE251 18480 bytes
SHA-256: f73fc5bc9d858a381122de15671139c08495c44f23cad4573f065f4985c1850b
font_01_sfnt_off000112ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112AB 10676 bytes
SHA-256: b66b3e442c947543a34298d05f28849f94b6fef3f5d69bb232c54eb8526039c7
font_02_sfnt_off00012af0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AF0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1