Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b6f85d71ab18e19…

MALICIOUS

PDF

72.1 KB Created: 2021-07-14 02:57:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: c9e39d21ac67f4e37530f41f0ee782b8 SHA-1: 28f3cc1aadb9e4fb36fd7bbcee254dee103ead03 SHA-256: 1b6f85d71ab18e1925ac1d728aecf8ceb89ec10a25ed7a0f153f26d89f07c45e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links, many pointing to compromised CMS upload directories or disposable hosting, suggesting it functions as a link farm. The primary purpose appears to be directing users to potentially malicious or phishing content hosted on these external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://leaguengn.com/userfiles/file///29258661182.pdf In PDF document text
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083347ef1cfd---makuzesogamogatis.pdfIn PDF document text
    • http://paradisetnl.com/FileData/ckfinder/files/20210710_F6D08188954D3D59.pdfIn PDF document text
    • https://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/b0f9852b72a507b5c52f143b94927747/11477148962.pdfIn PDF document text
    • https://regeneracion-capilar.com/wp-content/plugins/super-forms/uploads/php/files/6bcd209e1f5f1cd14f1aef3378c8c367/zuzubufijokugexivoxiput.pdfIn PDF document text
    • https://joepromenshealth.com/wp-content/plugins/super-forms/uploads/php/files/dc45a954a42d2faa678d680da1c18d1d/wogugomerubem.pdfIn PDF document text
    • https://eliteswimmingpoolsinc.com/wp-content/plugins/super-forms/uploads/php/files/frus22rfsdpt2a8jep4dib2a32/mupiworapumesejanivofabis.pdfIn PDF document text
    • http://md-servicios.com/userfiles/file/18304074004.pdfIn PDF document text
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160941459db88e---56680684438.pdfIn PDF document text
    • https://pensiuneavlasin.ro/wp-content/plugins/super-forms/uploads/php/files/q2j5e9tefbb231d6eaqicsgi5k/41552024612.pdfIn PDF document text
    • http://armanetti.com/images/79454636795.pdfIn PDF document text
    • http://aeronautike.com/userfiles/file/wuxemoponobusozusodipova.pdfIn PDF document text
    • http://ttworld.hu/uploads/content_files/files/gifufisadunimipekuj.pdfIn PDF document text
    • https://canevastoilestjean.com/upload/editor/file/tazupedusamaborijufu.pdfIn PDF document text
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c5b3583e92c---nomavev.pdfIn PDF document text
    • http://asiavent.com/UserFiles/file///71967135449.pdfIn PDF document text
    • http://qunjl.com/userfiles/files/zetopumakod.pdfIn PDF document text
    • http://ctmmaximoravenna.com/ckfinder/userfiles/files/nilazowo.pdfIn PDF document text
    • http://thankschicken.com/uploads/files/fiseguj.pdfIn PDF document text
    • https://777mto.org/contents//files/10095188232.pdfIn PDF document text
    • https://digireg.ch/upload/3625436758.pdfIn PDF document text
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/e3e799321b9586303dfe348eb8affafc/pokul.pdfIn PDF document text
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8f0001c770---bawutoli.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16076051d03fda---sivijibo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=chapter+3+test+form+a+the+constitution+answer+keyPDF 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_off0000b9d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB9D2 11292 bytes
SHA-256: ad66d8eb31701ae87f79337ab1c7b8d5bc5ff0c8ad13cb8c33f66c5b9c73f433
font_01_sfnt_off0000d45a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD45A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ec6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC6C 15104 bytes
SHA-256: 4f083bb686bf26b4f0b97d28499dca5c6ede3a09b03733a26cd3cad535e416f4

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