Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3d1cb6def4af98f…

MALICIOUS

PDF

70.0 KB Created: 2021-09-06 05:10:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 424c6611fa050d46cd163d2239d7a32a SHA-1: e6da84e4b98e478e6fb84271a6bd55a8be5b009d SHA-256: f3d1cb6def4af98ff1e8e9417608c6ac2f97a6ade7cccdef6e7e429daad58910
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many pointing to compromised websites or disposable hosting, suggesting a link farm used for phishing or malware distribution. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://pastoret.it/userfiles/files/41802146855.pdf In PDF document text
    • https://www.retake.dk/ckfinder/userfiles/files/tiram.pdfIn PDF document text
    • http://ubestsports.com/imager/files/20210606101147.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/1cc4e9626480cd9404537c9cf5db399a/siwogadajowumeporidunov.pdfIn PDF document text
    • https://heykidsletscook.info/wp-content/plugins/super-forms/uploads/php/files/bb23af957d631cbf76d357d6bb502fd8/87681043408.pdfIn PDF document text
    • http://baikalspring.ru/ckfinder/userfiles/files/93229218821.pdfIn PDF document text
    • http://limuzine.md/userfiles/file/zunibo.pdfIn PDF document text
    • http://quickvideo.nl/userfiles/file/wamurejo.pdfIn PDF document text
    • https://ifbscalidad.eus/files/galeria/files/21074421963.pdfIn PDF document text
    • http://ecovn.vn/uploads/news_file/11494694133.pdfIn PDF document text
    • https://a2designbg.com/userfiles/file/kimexibodamevepiv.pdfIn PDF document text
    • http://penoplex24.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160afc731bcc2b---rararakilenexamibisa.pdfIn PDF document text
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072639808971---7396534039.pdfIn PDF document text
    • https://hotelristorantenovecento.it/wp-content/plugins/super-forms/uploads/php/files/dba8a025be5e51622fb360d47d2c1aff/33664320426.pdfIn PDF document text
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/161254be8048ed---84940223962.pdfIn PDF document text
    • http://feriaalainversa.com/uploaded/files/xulasesakovoti.pdfIn PDF document text
    • http://zuche0551.com/upload/file/69210981531.pdfIn PDF document text
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/023a3mkb1j0hh194li74pofd4b/pedupixazixaradasekozo.pdfIn PDF document text
    • http://ehomeforeclosure.org/images/file/xurixa.pdfIn PDF document text
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/lgmrm11mp22t6ui939da26bate/nabegovezemeralikox.pdfIn PDF document text
    • http://safarekhoob.ir/basefile/safarekhoobir/files/56064461282.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/nibobipulosoven.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=plasmapheresis+in+sepsis+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_off0000b36f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB36F 10544 bytes
SHA-256: 7b49ef348005bbaa459e8ee2f1adcce8f9cbf408a683d0d49de8d15d40c356e0
font_01_sfnt_off0000cb23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB23 15500 bytes
SHA-256: b5833b063984aae85e302fa9eb53d7e8b14c50c425e1a3e206c46088fd323e3e
font_02_sfnt_off0000f2fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2FD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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