Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc5e9172f9e00df8…

MALICIOUS

PDF

70.2 KB Created: 2021-09-04 06:28:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 9924d666fb6e76b25605803eb236414b SHA-1: 8339b9ca2ebc3b4c0f1ee87f31a618d7ef096173 SHA-256: bc5e9172f9e00df8f49e0e8f34c2b7fe7265bbe9d327d58dabf8e2606fff56ff
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external links, many pointing to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to redirect users. 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 0.9956

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://mama-care.com/UserFiles/file/ludatinusozipigotiwem.pdf In PDF document text
    • http://sakem.org/userfiles/files/bejukosevekoj.pdfIn PDF document text
    • http://northmarking.com/userfiles/files/39920389389.pdfIn PDF document text
    • http://thallo-food.hu/uploads/ckfinder/userfiles/files/2799585451.pdfIn PDF document text
    • http://sllight.ru/design/img/upload/file/50506720097.pdfIn PDF document text
    • https://indobaliart.com/sitefiles/file/54353211898.pdfIn PDF document text
    • https://aurorabersinar2.com/contents//files/76383636405.pdfIn PDF document text
    • http://cuacuonnhanh.vn/Images_upload/files/6156603713.pdfIn PDF document text
    • http://verynailscm.com/user_img/file/61264592404.pdfIn PDF document text
    • https://indacphuc.com/wp-content/plugins/super-forms/uploads/php/files/t6i5de9c9rosd48v34pmnb42f5/lapupewiwi.pdfIn PDF document text
    • http://lafenicealcamo.it/userfiles/files/72839285566.pdfIn PDF document text
    • https://shreenathtechnologies.com/userfiles/file/dovigew.pdfIn PDF document text
    • http://asbazainville.org/userfiles/file/814562253.pdfIn PDF document text
    • https://waxparadise.pl/userfiles/file/veratifibipobivib.pdfIn PDF document text
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610aed80020d1---59497055719.pdfIn PDF document text
    • http://www.dj-csnl.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160d3cc8723529---lefavisixibuvadekujegigop.pdfIn PDF document text
    • http://www.tecs4.com/intranet/ckfinder/userfiles/files/wadumonasidizibaxuwila.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ddf5adb276---zugajizuguveki.pdfIn PDF document text
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/c64eb4cdb1313fd3f8027d05e90acddb/90102041880.pdfIn PDF document text
    • https://mauspro.net/upload/files/91836220176.pdfIn PDF document text
    • https://airshow-bg.com/file/xefigiwajinupub.pdfIn PDF document text
    • http://odpadykj.cz/UserFiles/File/popozike.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ea46ebe514---29334829863.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=old+man%27s+war+pdf+free+downloadPDF 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_off0000b2da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2DA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000caec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAEC 15924 bytes
SHA-256: 3b3d41570c61b2a5e4f83c2421d4bc585effddb137ad755034a447bdc5770d17
font_02_sfnt_off0000f364.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF364 10616 bytes
SHA-256: 31729f888636842eada183e9279145bc62411d51b5f74406f3952b45c3c0cfcb

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