Malicious PDF — malware analysis report

Static analysis result for SHA-256 fdb88d9d172ccf2c…

MALICIOUS

PDF

96.2 KB Created: 2021-07-23 03:12:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 9503b637cf674cb3209bd85fa6ec4b53 SHA-1: c87ccc2bb610355e911b45b9bb151f9f063de49f SHA-256: fdb88d9d172ccf2c0109cd0e73ef3c1bfab93c93ba3984b69f21096b29657ef1
156 Risk Score

Malware Insights

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

This PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links to external websites, many hosted on compromised CMS uploads or disposable domains, suggesting a link farm or phishing lure. The presence of these links and the overall structure indicate an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://best-infosystems.com/userfiles/file/76389625731.pdf In PDF document text
    • https://www.kadinlarsitesi.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606ed8fcb90a8---gelilojavowuvof.pdfIn PDF document text
    • http://adaviestransportltd.com/userfiles/file/zorisivikipisilup.pdfIn PDF document text
    • http://otoozevran.com/resimler/files/situbedamizibebupubela.pdfIn PDF document text
    • https://ayurvedaemart.com/uploads/file/20178359292.pdfIn PDF document text
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160943b39608d5---kokoxukozexoxamizi.pdfIn PDF document text
    • https://advik.net/userfiles/file/70534440990.pdfIn PDF document text
    • http://xn--80aafmoni2biho.xn--p1ai/admin/ckfinder/userfiles/files/60275567358.pdfIn PDF document text
    • https://forkidsvietnam.vn/wp-content/plugins/super-forms/uploads/php/files/sakvenuji11ur23s05msoei40q/65112418945.pdfIn PDF document text
    • http://kapli74.ru/upload_picture/11537794084.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ac122d1e25---68000541406.pdfIn PDF document text
    • http://xn--80aaeiengkwpz6p.xn--p1ai/pub/file/80990458680.pdfIn PDF document text
    • http://stin-verdon.fr/assets/Image//files/1232573723.pdfIn PDF document text
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cdd4512e65---31194170777.pdfIn PDF document text
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/459o3gost44ct4658dhobkn0d2/gipijixeburaborolo.pdfIn PDF document text
    • http://wabasnb.com/files/fckeditor/file/155388751060a65ba1b0c0a.pdfIn PDF document text
    • http://akademia-jedenastka.pl/zdjecia/fck/file/tamubomepeginuvanagu.pdfIn PDF document text
    • https://bazab.ru/ckfinder/userfiles/files/lesejimufoferadagak.pdfIn PDF document text
    • http://agataklimowska.pl/userfiles/file/putevemazobibuje.pdfIn PDF document text
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c488812769---8605725857.pdfIn PDF document text
    • https://garyjetcenter.com/wp-content/plugins/super-forms/uploads/php/files/44f1977db7a19236e584468abb1be7e7/65287196846.pdfIn PDF document text
    • https://maviet.vn/upload/files/lutawomasusom.pdfIn PDF document text
    • http://www.agenbenangbandung.net/file/faxosukevisava.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=interview+questions+and+answers+for+digital+marketingPDF 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_off00011399.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11399 11136 bytes
SHA-256: 66364030d534326b8c90456471cebfafbfd4e9dc32762166e2a872b6eefdd6f0
font_01_sfnt_off00012d2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D2C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001453e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1453E 17460 bytes
SHA-256: aa9c9f6536204a09814dcc8a34f18971af2b92777fd52da189fc1fb41177c504

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