Malicious PDF — malware analysis report

Static analysis result for SHA-256 49038ee165c487e6…

MALICIOUS

PDF

106.7 KB Created: 2021-08-01 11:51:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: c1f7fc46895ed844789c64e38d12b36b SHA-1: cde0f210e149f015c502fa8237b5de9bfe74e45c SHA-256: 49038ee165c487e6470ed21467e16af8650a1788b51a774f2060f19106fbef34
156 Risk Score

Malware Insights

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

The PDF file contains numerous links to external websites, many of which are identified as compromised CMS uploads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document's primary purpose is to act as a link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/160fd64631138a---venubimuroxuweg.pdf In PDF document text
    • https://spherule.org/wp-content/plugins/super-forms/uploads/php/files/191564706b9e314020c29e300d6c2746/fazatisapitafaduvab.pdfIn PDF document text
    • http://www.lifestaralberta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b070dc652ad---revajowu.pdfIn PDF document text
    • https://bodegoncriollo.com/userfiles/file/40021861803.pdfIn PDF document text
    • http://englishplanet.info/ckfinder/userfiles/files/masadufujatavofizuki.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076602f532df---29100591830.pdfIn PDF document text
    • https://beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/e84ebffb261bc0930ef00cc5b8f37117/fatodupazomuna.pdfIn PDF document text
    • https://www.syah.org/wp-content/plugins/super-forms/uploads/php/files/6150058e1dd7063c27cd363da4f19ed0/56943611105.pdfIn PDF document text
    • http://fine-cottage.ru/userfiles/file/gikumulobitikikome.pdfIn PDF document text
    • https://wegofa.com/userfiles/file/zedav.pdfIn PDF document text
    • http://artecgroupservices.com/imagenes/file/vajevilazivirenozix.pdfIn PDF document text
    • http://inter-travel.hu/_user/file/sikonabogixudew.pdfIn PDF document text
    • https://bykevin.com/wp-content/plugins/super-forms/uploads/php/files/b04ac5599c6c488a57886f1c80dd8cce/45340083623.pdfIn PDF document text
    • http://www.roosprommenschenckelfoundation.nl/ckfinder/files/files/88839383362.pdfIn PDF document text
    • http://lubrifianti-auto.ro/files/file/bugif.pdfIn PDF document text
    • http://yogathoitrang.com/quangbasanpham/app/webroot/upload/image/files/rafanukaremiv.pdfIn PDF document text
    • http://www.letnifestiwal.pl/ckfinder/userfiles/files/47285841877.pdfIn PDF document text
    • http://meble-tk.pl/userfiles/file/22824271888.pdfIn PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160aa079de8271---jevarirabikavopak.pdfIn PDF document text
    • http://villaelen.it/userfiles/files/92973301742.pdfIn PDF document text
    • http://avtoarka.ru/wp-content/plugins/super-forms/uploads/php/files/c65428ab635c5649e1f0bd901ae5181d/veminu.pdfIn PDF document text
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e3e56091eab---wadasi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=telecharger+iptv+pro+apk+gratuitPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011e1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E1F 17076 bytes
SHA-256: 0de4506d0b9214d49bd93232263f97ae600d0223b9f50d0abd0116b51a54d899
font_01_sfnt_off00013717.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13717 10600 bytes
SHA-256: 0087915815a64d6d1a789517c1b9ecf0476a6a9ea4668244bd4016f5fcd0addc
font_02_sfnt_off00014f7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14F7E 20880 bytes
SHA-256: 01949ec1a3fac618ddfbe0e43c5133373bd06edd3e9e420ca69561725b9f6d2d
font_03_sfnt_off000183fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x183FE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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