Malicious PDF — malware analysis report

Static analysis result for SHA-256 90580dbb51694fda…

MALICIOUS

PDF

93.3 KB Created: 2021-07-04 17:43:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 051ebf99ff348dc65017f874e229315e SHA-1: fbb23fd61ce6e5415f6ceb160297bf06989e319a SHA-256: 90580dbb51694fda36a2a58b21ed7f3cf71f3b2cce8ab5e3e583d0c02c5a70f9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by ML classifiers and ClamAV as malicious. It contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm or SEO poisoning attempt. The presence of these links indicates an attempt to direct users to potentially malicious or compromised external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 https://feldmann-spedition.de/pics/userfiles/file/67914264132.pdf In PDF document text
    • http://netinflux.net/userfiles/file/nevotutazuxu.pdfIn PDF document text
    • https://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/d1af7eaf9631e64655a676ad0bce4a87/bonavijiriv.pdfIn PDF document text
    • https://gtsonline.nl/wp-content/plugins/super-forms/uploads/php/files/4n9etvoha0lgfmtkj8n0g9q3rm/tisaxi.pdfIn PDF document text
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607a280c78df6---fuwidesikizapupujunun.pdfIn PDF document text
    • http://www.homefacelifters.com/wp-content/plugins/super-forms/uploads/php/files/5ec85a6ba27af450dcf46ccfc5c424db/zafogevemuwo.pdfIn PDF document text
    • http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/fac7752ae72adc0d1dd95022c3f4937c/bofotanepuwuximipidazipa.pdfIn PDF document text
    • https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/tce4eoi7h278lplr1j8ra5iujt/nisusavusi.pdfIn PDF document text
    • https://www.medipratik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bf017a06cc---6161096853.pdfIn PDF document text
    • http://jarosi.hu/files/file/53274166137.pdfIn PDF document text
    • https://www.ptlittleflower.org/wp-content/plugins/super-forms/uploads/php/files/s1m8sb584uu7kop2uogq14oqi0/64981488651.pdfIn PDF document text
    • https://123natura.com/stockages/files/tajezape.pdfIn PDF document text
    • https://www.eziblank.com/wp-content/plugins/super-forms/uploads/php/files/808e66980b7648c61759f738528ede56/boxoposowoxiwo.pdfIn PDF document text
    • https://xn----9sbccjdbca7cyaieg1a3j.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/59d0dc15ce7ec5c45577980fb750cbf0/dofoduzi.pdfIn PDF document text
    • https://dungcuruamui.com/wp-content/plugins/super-forms/uploads/php/files/if7irt07dmjuii8j2a7u0lg8sg/fexewezobunulenuxefip.pdfIn PDF document text
    • http://www.asejnrtigers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160acabf3929d8---kipudilezukumez.pdfIn PDF document text
    • https://fanaf.comarticle_ressources/file/werodiwajimus.pdfIn PDF document text
    • https://alarrabnews.com/images/content/content/file/kafoxosose.pdfIn PDF document text
    • https://southernlightingsource.com/wp-content/plugins/super-forms/uploads/php/files/3df20e0e9f393fd3f4f6f39263434215/1456835571.pdfIn PDF document text
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608423020ec42---mabure.pdfIn PDF document text
    • http://pozitron-s.ru/userfiles/file/18079360568.pdfIn PDF document text
    • https://adepotcustom.com/UploadFiles/file/20210603080849194.pdfIn PDF document text
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160719af10e733---kunepakadiwolamo.pdfIn PDF document text
    • https://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/onur3ridi8t6dge4702nkqnma4/39602534376.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=normal+vector+of+a+plane+from+an+equationPDF 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_off000106f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106F3 18004 bytes
SHA-256: 84b1fc2c707f264e1b6ee65ca7b418cbbefa75d8a5129337b1026b84c063e489
font_01_sfnt_off000136e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136E2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014ef9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14EF9 10764 bytes
SHA-256: f65c9a3669c228ac0360fa95751eb0070828fb5bcf7a1e28b9a0b0185ba4db5c

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