Malicious PDF — malware analysis report

Static analysis result for SHA-256 0bfa1d1b480e00e2…

MALICIOUS

PDF

80.7 KB Created: 2021-09-14 13:38:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 7afed65477484a946bce5289ad5a015b SHA-1: 0c748257a0739bd3113598f17c73233bfbb97a04 SHA-256: 0bfa1d1b480e00e2ff67541737193afc2aa7da066860ad16c472ed3a365befea
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by ML and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to PDF files hosted on compromised CMS uploads or disposable hosting, suggesting a link farm for SEO poisoning or phishing. The presence of external URIs and the nature of the detected malware indicate a likely attempt to lure users to malicious content or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://2222.netsociality.com/upload/files/52956181965.pdf In PDF document text
    • http://arndt-fahrschule.de/userfiles/file/26919854809.pdfIn PDF document text
    • https://durgabas.coop.np/ckfinder/userfiles/files/43540163746.pdfIn PDF document text
    • https://vinaconexmec.vn/uploads/news_file/lusagisodegaxapuxuj.pdfIn PDF document text
    • http://vibrosystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16133799c89d35---9696048991.pdfIn PDF document text
    • http://okeefesreef.com/ckfinder/userfiles/files/megukapagomazori.pdfIn PDF document text
    • http://noithatachau.vn/webroot/img/files/rusizepetagulunug.pdfIn PDF document text
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bf3f2c757d---96869955180.pdfIn PDF document text
    • https://dukupahit.com/contents/files/7488648184.pdfIn PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16135aed10cd0e---47333111611.pdfIn PDF document text
    • http://stavebnevyrobky.sk/www/upload/files/16994595884.pdfIn PDF document text
    • https://silverbirdmarketing.com/pages/images/file/79343904105.pdfIn PDF document text
    • http://sanmorales.es/userfiles/files/febox.pdfIn PDF document text
    • http://wsm.hk/images/files/pejufipimubesirapasuvamex.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/1613cc1fa3473f---zopevifamamub.pdfIn PDF document text
    • http://rm-centr.ru/uploads/file/vonavudaveromumujadofaf.pdfIn PDF document text
    • http://rebeccaosborne.com/uploads/43116609691.pdfIn PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d97e3482a0---zozesigamewurubezugefum.pdfIn PDF document text
    • http://www.centrosanmarco.eu/img/news/files/kabegofulo.pdfIn PDF document text
    • http://www.udelimpa.es/ckfinder/userfiles/files/bisanupusiwomivim.pdfIn PDF document text
    • http://yuanjiangchem.com/upload/files/poriwevoxemogis.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/o72ejike05s5snltej1jtj7ph2/pavurabemosomama.pdfIn PDF document text
    • http://twfbs.com/ckfinder/userfiles/files/66941251078.pdfIn PDF document text
    • http://electric-kernbichler.at/70630906274.pdfIn PDF document text
    • http://fanghsin.com/uploads/files/202109070227414271.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=how+to+create+an+album+on+androidPDF 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_off0000d7d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7D6 10680 bytes
SHA-256: fb6d9b2a99c6d22e8411657dc2b464abd1b6c2de39c3c5c2eb232c913d26ec44
font_01_sfnt_off0000f043.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF043 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010855.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10855 17164 bytes
SHA-256: e4e42ce4f1b9195bbdf0f54eba892c61781229cd09cbeffeed9e5fe793a8ca2f

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