Malicious PDF — malware analysis report

Static analysis result for SHA-256 89c2b6fcad2b1156…

MALICIOUS

PDF

69.6 KB Created: 2021-10-01 13:57:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 2d618387c36d5065b00d7dce126d4a2c SHA-1: c8e9ccdfd3b634d4854b43378f2da215501cd539 SHA-256: 89c2b6fcad2b11565725be50b6b5ecb609ee2f62512b2a971784ed8a21d30cc9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, with numerous URLs pointing to compromised WordPress upload storage and other domains, likely to distribute malware or phish for credentials. Although no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of a phishing or malware distribution lure, aligning with the Spearphishing Attachment technique.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614acf3e935e8---55896463627.pdf In PDF document text
    • http://phanphoiongnhuahoasen.vn/upload/files/6070270520.pdfIn PDF document text
    • http://ajarnveerapong.com/UserFiles/file/natatutamozapodep.pdfIn PDF document text
    • https://greenlakepaint.com/ckfinder/userfiles/files/22059277123.pdfIn PDF document text
    • http://metalltechnik-kutschi.at/80787813517.pdfIn PDF document text
    • http://educasters.co/ckfinder/userfiles/files/48610815089.pdfIn PDF document text
    • http://msci.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/16148a8bd4e545---39468149152.pdfIn PDF document text
    • http://hiroi-es.info/yamituki-n/uploads/files/pakomomexufetefatabuwuxe.pdfIn PDF document text
    • http://studiomanzetti.it/userfiles/files/pufumixifixej.pdfIn PDF document text
    • http://all-premium.com/user_file/files/22837167392.pdfIn PDF document text
    • https://heyratacademy.ir/file/82095017887.pdfIn PDF document text
    • http://basketaci.cz/UserFiles/File/kuvalamenafedezi.pdfIn PDF document text
    • https://fnb-concepts.com/images/uploads/files/17095361723.pdfIn PDF document text
    • http://sxnqx.org/upload/file/Fl202109062026143989.pdfIn PDF document text
    • http://isystem.hu/userfiles/file/nuxega.pdfIn PDF document text
    • https://adikmanis.com/contents/files/20511687813.pdfIn PDF document text
    • https://harkakotony.hu/UserFiles/file/29368447477.pdfIn PDF document text
    • https://dawnraytech.985.tw/data/file/userfiles/files/kugesuxiragetibakifin.pdfIn PDF document text
    • https://aicpwdosaeast.com/ckfinder/userfiles/files/feragijulusidajaju.pdfIn PDF document text
    • https://novsport.com/content/File/39401209456.pdfIn PDF document text
    • https://www.okcfarmersmarket.com/wp-content/plugins/super-forms/uploads/php/files/1f2b3c68235bc1e1f627b4a59798d84b/tobolefabimamapilikuk.pdfIn PDF document text
    • https://acethamessecurity.co.uk/wp-content/plugins/super-forms/uploads/php/files/3ac30394fd0fd3174efcbc934af4861a/kexoxo.pdfIn PDF document text
    • https://firesystem.ro/imagini_ws/34197044496.pdfIn PDF document text
    • https://gancza-yacht.pl/userfiles/file/67659431442.pdfIn PDF document text
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/161447446b64ae---muxeroj.pdfIn PDF document text
    • http://dobre-jaja.com/Upload/file/59034389398.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=imo+beta+apk+2018PDF 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_off0000b10c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB10C 15540 bytes
SHA-256: a87015d7fb4f7a7657719f7e777c8bc53f48a6a24e88c57dd414de2741ed18f7
font_01_sfnt_off0000d8a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8A2 10588 bytes
SHA-256: 4c63531de9d2b8a86eb69e30f80a9a5497fc4e47140c54765ec2738beb0696f9
font_02_sfnt_off0000f0ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0BA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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