Malicious PDF — malware analysis report

Static analysis result for SHA-256 71773bece83acab3…

MALICIOUS

PDF

81.1 KB Created: 2021-09-13 09:23:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: ba4ec74a58a9b7314cda2d19ff58ec3c SHA-1: 4c317fbba14f842c4604a09d0da4c36e4ed62daa SHA-256: 71773bece83acab341c2cc82226ac4f7ee25a838d307a847d0ed48f549393b52
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URIs, many of which are hosted on compromised or disposable domains, indicating a phishing or malicious redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to lead users to further malicious content or downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139406932b5a---28220032392.pdf In PDF document text
    • http://lpxs168.com/filespath/files/20210910151529.pdfIn PDF document text
    • https://likeevent.it/writable/public/userfiles/file/fekikijufuviriwuj.pdfIn PDF document text
    • http://sswjeans.com/files/pizoxagabasisugekivov.pdfIn PDF document text
    • https://electroagro.es/pub/files/lojejakozad.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/0c320a031271d3535ac462d311305d6a/tilipufatixepajizajo.pdfIn PDF document text
    • http://tienphat.vn/imagesflashupload/file/85737281450.pdfIn PDF document text
    • http://sibinetweek.ru/userfiles/file/84028957680.pdfIn PDF document text
    • http://thietbiantoanttk.com/uploads/files/fodijevef.pdfIn PDF document text
    • https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/sj2vk3mof5s2615qb56gjnpcp0/buxetizutovez.pdfIn PDF document text
    • http://elskenecologie.nl/files/xisotisowuvapogovipaw.pdfIn PDF document text
    • https://hobbyschuurtje-webwinkel.be/images/userfiles/file/24311252479.pdfIn PDF document text
    • https://happycolaborativo.com/uploads/files/88860659417.pdfIn PDF document text
    • https://www.liftechforklifts.com.au/application/third_party/ckfinder/userfiles/files/gimugelojezowezam.pdfIn PDF document text
    • https://landbar.com/app/webroot/js/ckfinder/core/connector/upload/files/22031843010.pdfIn PDF document text
    • https://nobelboya.com/userfiles/file/janajukoxusunobexikizuje.pdfIn PDF document text
    • https://lawyerupsmart.com/tempimg/file/jowavapatudemamarovitos.pdfIn PDF document text
    • https://zippy-inc.com/app/webroot/userfiles/files/49712961388.pdfIn PDF document text
    • https://alsultantrading.ae/userfiles/files/34024489480.pdfIn PDF document text
    • http://ylplj.com/ckfinder/userfiles/files/2410379137.pdfIn PDF document text
    • http://tpt.taipei/asset/uploads/files/54420570594.pdfIn PDF document text
    • https://mavachhaiphong.com/upload/files/31835154296.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=free+photo+editing+software+download+for+pcPDF 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_off0000d9d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9D0 16952 bytes
SHA-256: 35e71baa6fa775218dbdbf727cc2d5416896106afb72567beba51a5cba1e52a2
font_01_sfnt_off00010593.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10593 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011daa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DAA 10960 bytes
SHA-256: 53d1907469b970930c90c83415a10a5a12946eb2e8075c9dbf64e02f12832303