Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8e72ddb3d826835…

MALICIOUS

PDF

80.6 KB Created: 2021-08-16 02:49:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 3cb961bc9bc18ebf9f40a40ac3c9deb9 SHA-1: 939e9b8ea34f0c9c7e6ac3b18e54f3a1290c6076 SHA-256: e8e72ddb3d826835037ded2880fc2f2cfa04a78b09d260d6192111efb4477b03
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to domains flagged as link farms or hosted on disposable infrastructure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery. The presence of multiple links to potentially compromised CMS upload directories further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://albino-pitti.com/pub_img/file/biwesififemoliwexuvofubuz.pdf In PDF document text
    • http://ipceurope.com/assets/file/reteweveputozetofifab.pdfIn PDF document text
    • http://grupogmec.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c99dfc1301---logazimevogopewalu.pdfIn PDF document text
    • http://keitbg.com/images/files/gudagifugiwejuseloki.pdfIn PDF document text
    • https://scavilecis.it/userfiles/file/50798896722.pdfIn PDF document text
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090973959d22---78398611199.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1610bfc88e102c---19869208014.pdfIn PDF document text
    • https://bayihoki99.com/contents//files/xoripivejebonifi.pdfIn PDF document text
    • http://bigdoughpizza.com/uploads/files/mogusamelapixa.pdfIn PDF document text
    • https://klcmekatronik.com/ckfinder/userfiles/files/rigavakupogebefini.pdfIn PDF document text
    • http://x-site.by/upload/editor/files/27331206049.pdfIn PDF document text
    • https://towa-aaa.jp/userfiles/file/21653156259.pdfIn PDF document text
    • http://lovesushiscv.com/uploads/files/matogorimi.pdfIn PDF document text
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/160c2b3310c4a6---gawojixanozejigujewezoxa.pdfIn PDF document text
    • https://whiteplacard.com/UserFiles/file/9096759517.pdfIn PDF document text
    • https://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/o4j15tnmmtvlllb3v0fips8g03/40637645105.pdfIn PDF document text
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160982ab605603---mogesusuk.pdfIn PDF document text
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160c91beb697ba---16268881106.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/d9a3dd5f10d393225f69381d7967c0eb/41104375912.pdfIn PDF document text
    • http://neodev.space/wp-content/plugins/formcraft/file-upload/server/content/files/160a43ccc13cc6---vapavapirofizejune.pdfIn PDF document text
    • https://floridainvestment.cz/files/file/54094863199.pdfIn PDF document text
    • http://foto-preiss.at/upload_files/files/68601603602.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=unimaid+first+batch+admission+list+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_off0000d655.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD655 10900 bytes
SHA-256: 5e02e63ebd3fcfcb301e47c1e103c85aa13e3e8ed7b9c7bcbbdc77417e06097c
font_01_sfnt_off0000ef0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF0F 16756 bytes
SHA-256: 8ff45919a27d592bcff95702a9e245df59659c51243cd0877b5fbe6e0e89f031
font_02_sfnt_off00011a7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A7F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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