Malicious PDF — malware analysis report

Static analysis result for SHA-256 1428818b7ae33b4d…

MALICIOUS

PDF

82.7 KB Created: 2021-08-25 13:53:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 13322e39e3477285fea1f263c99fc77f SHA-1: f197f731c5c276ef64d51a8cc99c17b361e9f824 SHA-256: 1428818b7ae33b4dc9e4b4015b2dc43427654888ad4943f36da098948c3b112d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised websites and disposable hosting, indicative of a link farm used for phishing or malware distribution. ClamAV and ML classifiers strongly flagged this PDF as malicious, specifically as a phishing trojan. While no scripts were directly extracted, the structure and URL patterns suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

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://miamiwars.pl/wp-content/plugins/super-forms/uploads/php/files/fd145b1f155445f65c73cae0e8296a60/17753398990.pdf In PDF document text
    • http://anquocrealty.com/uploads/image/files/47664498700.pdfIn PDF document text
    • http://gvs-russia.ru/admin/ckfinder/userfiles/files/47677107952.pdfIn PDF document text
    • https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a2dc2cd0480---41354297167.pdfIn PDF document text
    • https://cortemadera.com/wysiwygfiles/file/84785846777.pdfIn PDF document text
    • https://vv-alc.nl/uploads/files/wovukizojedij.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160930dea6d9d9---zolaxoguxelebereduforaf.pdfIn PDF document text
    • http://teusz.pl/UserFiles/file/29143267562.pdfIn PDF document text
    • https://iqmuseum.mn/uploads/files/guwuriloxo.pdfIn PDF document text
    • http://goshaggers.com/clients/2/2c/2ce39afd4341152949bc146f79210d6f/File/35455763625.pdfIn PDF document text
    • http://cappellastudio.it/userfiles/files/gudesivipunuzeno.pdfIn PDF document text
    • http://aquamedia.cn/ckfinder/userfiles/files/1852771442.pdfIn PDF document text
    • http://xn--80aamdqpfpr.xn--p1ai/upload_picture/lovuma.pdfIn PDF document text
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/160967ab67ed09---449540038.pdfIn PDF document text
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608390c4cd659---kelaxikoxibizipowifijusox.pdfIn PDF document text
    • https://study-abroad-travel.com/ckfinder/userfiles/file/61230051828.pdfIn PDF document text
    • http://seosanhrd.com/userfiles/file/wisusovowupa.pdfIn PDF document text
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160e1d2edb172d---42495338845.pdfIn PDF document text
    • https://profipreklady.cz/www/ckfinder/userfiles/files/mazuziserula.pdfIn PDF document text
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c15bd5e6425---fusulavajetazapof.pdfIn PDF document text
    • http://sun-eko.eu/files/file/lixejitilelotafojiwad.pdfIn PDF document text
    • https://sharpconsulting.us/app/webroot/ckfinder/userfiles/files/4462185935.pdfIn PDF document text
    • https://www.nestroots.com/wp-content/plugins/super-forms/uploads/php/files/48obp82rertat58h0809s76na4/bavobubiwu.pdfIn PDF document text
    • http://lesen-und-schenken.de/userfiles/files/43447027853.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=convert+10+miles+to+yardsPDF 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_off0000df37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF37 16968 bytes
SHA-256: 5cb132179819a015e88274b432ec3eee5c5110336296efac0b9ce48631c3007a
font_01_sfnt_off00010b75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B75 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001238c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1238C 10796 bytes
SHA-256: e7ffe4ccee9b6fc5a60f99873f0c206f0a4272516d30819e3885bce6fae6f7fb

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