Malicious PDF — malware analysis report

Static analysis result for SHA-256 fbf2dd58b1de95cb…

MALICIOUS

PDF

80.3 KB Created: 2021-09-15 23:06:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 86fd9d99d80e08b43224cb416908ed3f SHA-1: beb256941cbfb1387111ab2ad3b37f25d20dd51c SHA-256: fbf2dd58b1de95cbdfe7617ea5515458cb32e155c9e750bd0515bd170b9466b8
196 Risk Score

Malware Insights

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

The sample was flagged by ML classifiers and ClamAV as malicious, with specific heuristics indicating a social engineering attack (ClickFix) that instructs users to run commands. The PDF contains numerous links to external sites, some hosted on compromised CMS platforms, suggesting a phishing or malware distribution attempt. While no scripts were directly extracted, the nature of the ClickFix heuristic implies the potential for JavaScript execution or command-line interaction to achieve its malicious goals.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • ClickFix social engineering attack high SE_CLICKFIX
    Document instructs the user to press Win+R or paste a command into a terminal — consistent with ClickFix attacks that bypass macro restrictions by tricking users into running malicious commands directly
  • 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://sbnjl.com/userfiles/files/70215003950.pdf In PDF document text
    • https://best-of-geldanlagen.de/userfiles/file/jurotiw.pdfIn PDF document text
    • http://karcannakliyat.com/userfiles/file/mopomovo.pdfIn PDF document text
    • http://ayurveda-shiatsu-nice.com/upload/files/metoxozogi.pdfIn PDF document text
    • https://hylyt.co/wp-content/plugins/super-forms/uploads/php/files/e42489019c5d25f114cee3369265c455/zunafanukujoli.pdfIn PDF document text
    • http://delve-cr.com/uploads/33002064217.pdfIn PDF document text
    • http://fioredda.com/userfiles/files/wuzafek.pdfIn PDF document text
    • https://tourgardan.com/basefile/tourgardancom/files/tofuzivupepuzo.pdfIn PDF document text
    • https://estudiowebcolombia.com/ckfinder/userfiles/files/70711265271.pdfIn PDF document text
    • http://lj-group.cn/upload/files/4833097366.pdfIn PDF document text
    • http://xaydunglenguyen.vn/upload/files/0dd4d4.pdfIn PDF document text
    • https://trisyscom.com/userfiles/file/27220437434.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133f1a24a71a---67023528648.pdfIn PDF document text
    • https://starfoil-mail.nl/uploads/wysiwyg/72775950086.pdfIn PDF document text
    • https://luatkhangthai.vn/upload/fck/file/xatunepukifujuwifenajudo.pdfIn PDF document text
    • https://sibiucuratenie.ro/fckeditor/userfiles/file/99881766932.pdfIn PDF document text
    • http://duhochoangthanh.com/upload/files/83835201498.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16138387dc7ead---63168487305.pdfIn PDF document text
    • http://ambiance-cinema.fr/wp-content/plugins/super-forms/uploads/php/files/338eddfd4131eee3e1a62b7c38e3ac5f/74341374926.pdfIn PDF document text
    • http://tuning-zone.eu/userfiles/file/tariwosoxuwa.pdfIn PDF document text
    • http://massimosusto.eu/userfiles/files/54213187377.pdfIn PDF document text
    • https://majubesar.info/contents/files/13665487495.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=get+phone+off+safe+modePDF 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_off0000d4df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4DF 18060 bytes
SHA-256: cd617c867c5550fac802cab8bad920b462e43d3bac5d1e84d0faabc6867c43f6
font_01_sfnt_off00010382.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10382 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011b99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B99 10564 bytes
SHA-256: b76c8065589003efa995f4dc19ec87a94cdedc407650e4b79a191e814a011ed9

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