Malicious PDF — malware analysis report

Static analysis result for SHA-256 679b2b7dcf845618…

MALICIOUS

PDF

99.9 KB Created: 2021-08-13 11:23:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 22da65d797303b3765cd4397ebb27e40 SHA-1: d2e71e614e632f96c3d0790473fa4da1a989b73c SHA-256: 679b2b7dcf8456184b9e2b8d1714e38c27e23790eda8e092c9bbf03d8b097e46
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many pointing to compromised CMS uploads and disposable domains, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly support its malicious nature. No scripts were extracted, but the structure and URL patterns are indicative of a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://albino-pitti.com/pub_img/file/dikulutedegumuziruv.pdf In PDF document text
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/16081e3800ead7---50093716709.pdfIn PDF document text
    • https://nailseasupportgroup.com/wp-content/plugins/super-forms/uploads/php/files/9e5ee6d8c894851acb639b9e58b29556/rurukineki.pdfIn PDF document text
    • http://wujipacking.tw/upload/files/51143428847.pdfIn PDF document text
    • http://owv-sad.de/userfiles/files/54546510472.pdfIn PDF document text
    • http://churchontherockuk.org/home/churchontherock1/public_html/userfiles/files/reruzurujirotenixijiver.pdfIn PDF document text
    • http://ersatzmonitor.de/userfiles/file/81960445490.pdfIn PDF document text
    • http://aldercrest.com/files/kadufabifulovixez.pdfIn PDF document text
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/dd9adbee82669f6c03e7f3768690c13c/87195828659.pdfIn PDF document text
    • http://hotstamping.pl/files/file/17899137218.pdfIn PDF document text
    • https://takeorders.online/wp-content/plugins/super-forms/uploads/php/files/g3a5fheticncs34i4iaitslokk/zotutexosilivata.pdfIn PDF document text
    • http://standrewsparishhighschoolclassof1964.com/clients/70428/File/tusazefowekuguzexasa.pdfIn PDF document text
    • https://rumahbaruku.com/contents//files/polosatitosebepawepoxe.pdfIn PDF document text
    • https://www.temsilcisitesi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f02090ea865---jewarebigiruxizenugokigo.pdfIn PDF document text
    • https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/1583db116b4578c5395fcb1ecc58c898/41185012647.pdfIn PDF document text
    • http://gusanhightec.com/userData/board/file/fotetevakajutudasozaj.pdfIn PDF document text
    • https://powermailer.in/userfiles/file/16567225039.pdfIn PDF document text
    • http://lezeckastenakosice.sk/upload/files/95534217287.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ec9fa96c9b8---batadepolujep.pdfIn PDF document text
    • http://tingchucontrol.com/Uploadfiles/files/fedukixu.pdfIn PDF document text
    • https://signika.pl/Upload/file/17848081591.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/43qgin6fn4r394tk71078lv934/pepuxur.pdfIn PDF document text
    • http://backkwang.com/userData/board/file/bidazutuzupaketeki.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=how+to+read+binary+code+pdfPDF 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_off000122ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122AC 17748 bytes
SHA-256: 1c569a6ec8a28a6a48fd90de1697a669affcafb4845f00eefa9052407bf5ca3a
font_01_sfnt_off0001510e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1510E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00016925.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16925 10728 bytes
SHA-256: af0143cabdd6daff9c4d20a4feac626e16e9409abfa92fac87017cfb8a1ed505

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