Malicious PDF — malware analysis report

Static analysis result for SHA-256 f95932dceee784b0…

MALICIOUS

PDF

82.0 KB Created: 2021-09-03 10:48:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 4afcaae77cbb360948ab1e2a3d063f93 SHA-1: caa98dfa74d84504ac1888503cbf8f9e20428029 SHA-256: f95932dceee784b0c8ec6623b5f329c9147421834e3edf01d942be1209ae10b1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with phishing or malware delivery campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://2015.letnifestiwal.pl/ckfinder/userfiles/files/29031938655.pdf In PDF document text
    • https://alasclub.gr/neuro/ckfinder/userfiles/files/15824949360.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084194127936---51659089879.pdfIn PDF document text
    • http://mgtuae.com/uploads/file/11366468597.pdfIn PDF document text
    • https://hobbes-group.com/upload/files/85575539500.pdfIn PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2b9c95b156---beruzasivezo.pdfIn PDF document text
    • http://immobilieninvestors.de/userfiles/file/kamazimumivog.pdfIn PDF document text
    • http://www.cenlafilm.com/siteuploads/editorimg/file/86231162620.pdfIn PDF document text
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160be29cd7ee28---85851224843.pdfIn PDF document text
    • http://boldogelet.hu/media/pusovutowulitomoxidabelad.pdfIn PDF document text
    • http://anticacarsulaeborzoi.eu/userfiles/files/62097122093.pdfIn PDF document text
    • http://nocleginaplus.pl/uploads/userfiles/files/96877621477.pdfIn PDF document text
    • http://mfcwestenkwartier.nl/beta/userfiles/file/79094763790.pdfIn PDF document text
    • http://sxcec.org/userfiles/file/wovuvupemek.pdfIn PDF document text
    • http://steelfurniturecn.com/d/files/86227474591.pdfIn PDF document text
    • http://cana.vn/uploads/userfiles/file/60243938649.pdfIn PDF document text
    • https://plagij.at/ckfinder/userfiles/files/wumuganixa.pdfIn PDF document text
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/160caccb8761fa---16657315132.pdfIn PDF document text
    • http://forter.vn/hinhanh/file/43006568578.pdfIn PDF document text
    • http://xn----7sbabjkhbzbqti4a3apfmdd2s4b.xn--p1ai/ckfinder/userfiles/files/32862828895.pdfIn PDF document text
    • http://urgentcarepb.com/userfiles/file/bobus.pdfIn PDF document text
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/160b65b22dc172---pakogadifodapedadib.pdfIn PDF document text
    • https://vendax.ro/files/file/40479243335.pdfIn PDF document text
    • https://www.clubmanizales.com.co/wp-content/plugins/formcraft/file-upload/server/content/files/1610a81b4c0dca---zagirazakomusisedibudipe.pdfIn PDF document text
    • http://stroyvodservice.ru/upload/File/31763107863.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=8051+microcontroller+instruction+set+notes+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_off0000d787.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD787 11140 bytes
SHA-256: 0a20dfcc00ed63aa3a3b242eda665c5eab47134b8cf55cead12ace9b819b0434
font_01_sfnt_off0000f191.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF191 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000109a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109A3 18600 bytes
SHA-256: 4cb87db4b8372878e3faa2a5e6e0c1fa4086a5d47afe9c8a98d3abbe7e27b433

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