Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd73c3a04fa73ebd…

MALICIOUS

PDF

79.3 KB Created: 2021-09-18 16:01:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: da25bb37ea198bfcb63c1c2225bd5b08 SHA-1: 05a4bfc14b167bb1e15943f27e6acbf72e705e2a SHA-256: dd73c3a04fa73ebdfbf5e02eb8e909e7b7edb101db519538812987199bea04dc
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs pointing to compromised WordPress upload storage and other disposable hosting sites. The primary purpose appears to be redirecting users to external content, potentially for phishing or to download further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c276710bcf---94953389190.pdf In PDF document text
    • http://zajazd-broadway.pl/galeria/file/makeputatasogar.pdfIn PDF document text
    • http://bibrka-school.org.ua/ckfinder/userfiles/files/36818787290.pdfIn PDF document text
    • http://texmet.pl/userimages/file/41610626980.pdfIn PDF document text
    • http://peter-crooks.com/userfiles/file/fabajurepusi.pdfIn PDF document text
    • https://mimpishio2bet.net/contents/files/8510689466.pdfIn PDF document text
    • https://posaonakosovu.com/ckfinder/userfiles/files/1449589807.pdfIn PDF document text
    • https://ascii.tn/web/cgi/file/bomatefafizigot.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/161418af23a8a5---98993213636.pdfIn PDF document text
    • http://ambcavallon.eu/userfiles/files/56843492067.pdfIn PDF document text
    • http://inphuduong.vn/upload/files/semunuzodavurixizi.pdfIn PDF document text
    • https://nothingbutsafetyglasses.com/userfiles/file/64720824815.pdfIn PDF document text
    • https://indicaperu.com/userfiles/file/11388467167.pdfIn PDF document text
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613aaf58e33aa---65484335141.pdfIn PDF document text
    • http://falegnameriacastiglione.it/userfiles/files/6652831300.pdfIn PDF document text
    • https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/1beb37cba611569f03ba086c7f3be47e/xujelufewi.pdfIn PDF document text
    • https://thuaphatlaihoanghuy.com/uploads/files/62807019324.pdfIn PDF document text
    • http://papaicountrylodge-longstay.com/user_img/files/denogosibox.pdfIn PDF document text
    • http://ctcinsulator.com/uploads/file/zakabakagilubix.pdfIn PDF document text
    • http://homeopathyhk.com/files/leboravojuk.pdfIn PDF document text
    • http://dreambeauty.kr/upload/fckeditor/file/figov.pdfIn PDF document text
    • http://schule.havonix.com/ckfinder/userfiles/files/fuzokuredonorikerubum.pdfIn PDF document text
    • http://makaroma.fr/upload/file/62327730773.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/161376f023e423---tenulizufimupumiretasumu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=gta+vice+city+stories+apk+and+obbPDF 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_off0000d16b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD16B 10912 bytes
SHA-256: 4d2dae804956ccf610ba15fb1b305875ed0e2a3306770611ae865caabf477d61
font_01_sfnt_off0000eaad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAAD 17156 bytes
SHA-256: 20df296417df7dd29c50d4fa375dedab5bb2e1b38193d4947404a7298a4a891a
font_02_sfnt_off00011738.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11738 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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