Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a9b289ec2fc907b…

MALICIOUS

PDF

79.4 KB Created: 2021-09-12 20:29:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 72aa5e776e3b6109a5f663aa7c30477b SHA-1: fd597f6965d70dc7962a2ca64cff1eaaa44aa603 SHA-256: 9a9b289ec2fc907bca6a1baf685619e795ba59771c873623bbeb2d9b9c726575
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of these link farms and the overall structure strongly suggest an attempt to trick users into downloading further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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://brkvinc.com/userfiles/file/93127945557.pdf In PDF document text
    • http://paroissedementon.fr/upload/files/vojututoxadaloxafilivama.pdfIn PDF document text
    • http://air-separation-supplier.com/d/files/mufujadawefizeb.pdfIn PDF document text
    • http://www.bongbansaigon.com/uploads/files/20656344754.pdfIn PDF document text
    • http://entone.es/wp-content/plugins/super-forms/uploads/php/files/099fcd5c3709e4f7b7adf2433f7a260a/91177568826.pdfIn PDF document text
    • http://gewald.ru/content/Files/sutirafigekukadapamo.pdfIn PDF document text
    • https://viboot.com/ckfinder/userfiles/files/21084150573.pdfIn PDF document text
    • https://callhfelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/161362c9a78890---lizupumojebovaledoxif.pdfIn PDF document text
    • https://gamedunyasi.com/calisma2/files/uploads/witosotanat.pdfIn PDF document text
    • https://healthmatters.me/userfiles/file/4566256233.pdfIn PDF document text
    • https://godahoian.com/app/webroot/upload/files/8911933835.pdfIn PDF document text
    • http://imobiliariaimperio.com/files/files/90768224104.pdfIn PDF document text
    • https://djhelaly.com/wp-content/plugins/super-forms/uploads/php/files/f18badc5d0364096009ef047db8f6a9a/tadibakiwope.pdfIn PDF document text
    • http://onlineticketreview.com/images/file/81379393111.pdfIn PDF document text
    • https://transdeliveris.lt/userfiles/file/77724776583.pdfIn PDF document text
    • http://myphamasia.net/upload/files/bizositalimidu.pdfIn PDF document text
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613407b9d724e---27277566977.pdfIn PDF document text
    • http://transchem-tech.com/Uploadfiles/files/wobowivininitilag.pdfIn PDF document text
    • https://by-express.com/upfiles/editor/files/52473332325.pdfIn PDF document text
    • http://kechengchem.com/upload/files/48455509794.pdfIn PDF document text
    • https://xo-sound.ru/userfiles/file/jamuvixobixakafuleduv.pdfIn PDF document text
    • http://lovesushiscv.com/uploads/files/juruzigezos.pdfIn PDF document text
    • http://colegiosantarosa.com/uploads/imagem/file/fileralomisemotumi.pdfIn PDF document text
    • http://hastensandbreakfast.nl/userfiles/file/vubevaseluradusujo.pdfIn PDF document text
    • https://associazionemusicaviva.it/uploads/file/45725765635.pdfIn PDF document text
    • http://dieterheich.de/images/uploads/file/65989450368.pdfIn PDF document text
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130d99643369---97714467213.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=neha+kakkar+song+download+mp4PDF 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_off0000cdf8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDF8 18588 bytes
SHA-256: 25f1fbbc689051c5fa411cfc3a15099f4b618da950f904254f7cf55b0e167b87
font_01_sfnt_off0000ff05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF05 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001171c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1171C 10884 bytes
SHA-256: 7da3d05602df4f2af252c8429a77f325cc7215a22970a2d66d11640333bf7e33

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