Malicious PDF — malware analysis report

Static analysis result for SHA-256 066a517a43f278b3…

MALICIOUS

PDF

89.2 KB Created: 2021-08-02 21:59:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 756468e9fa9481b7c88c84b252e929be SHA-1: 7a1ae3325a0ee16a3557758a57be8f8281d6a3e1 SHA-256: 066a517a43f278b3b7d3136ee8c257b07e56540f0e17b2dc65631f05d02b7722
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of external links, many of which point to compromised WordPress upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is unreadable binary data, providing no direct clues to its purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160c46a6698eda---8476905456.pdf In PDF document text
    • https://iqmuseum.mn/uploads/files/vaxuxamiziraboru.pdfIn PDF document text
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/evpl64lpfa82h1alnkqbr9fj55/topuvigo.pdfIn PDF document text
    • http://mazdooradda.com/userfiles/file/murinafokopi.pdfIn PDF document text
    • http://ukuleleceilidh.ca/clients/860383/File/3792526644.pdfIn PDF document text
    • https://londonvipchauffeur.co.uk/wp-content/plugins/super-forms/uploads/php/files/2ef28e05ca26857df7d29e197d8e3d50/pasifasijovojas.pdfIn PDF document text
    • https://www.lamuccacompany.com/wp-content/plugins/super-forms/uploads/php/files/42b4b7c0b441de298538d8af2135ad68/35447841896.pdfIn PDF document text
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/160dea3c03dac5---kedaw.pdfIn PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160904a424f5cd---jekakijodokawalitebu.pdfIn PDF document text
    • https://zold-kommando.hu/files/52075164098.pdfIn PDF document text
    • http://mrsinternationalbeautypageant.com/clients/8/8c/8c0f0497d7166b07b5568c04be8084ca/File/lipigi.pdfIn PDF document text
    • https://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/mruomb525em7lkled090bcb10j/remesit.pdfIn PDF document text
    • http://m-s-g.ru/userfiles/files/jesedositolofevuzis.pdfIn PDF document text
    • https://badrivishal.com/media/6587489999.pdfIn PDF document text
    • https://arizonalightingsales.com/wp-content/plugins/super-forms/uploads/php/files/8e9d5887b2ce778e8df90ec2473de376/tizanumuzefagoxebob.pdfIn PDF document text
    • http://pocatellocampfire.com/wp-content/plugins/super-forms/uploads/php/files/q8s3cjcns9ikkdn1ustbsvqdbc/67364179731.pdfIn PDF document text
    • http://villaturri.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b12ed71128c---60530566179.pdfIn PDF document text
    • https://www.basur-tedavisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cbf1be6ed5---robegoseban.pdfIn PDF document text
    • https://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160aa0927b985a---pebubobopej.pdfIn PDF document text
    • http://www.masozilina.sk/ckfinder/userfiles/files/9634755917.pdfIn PDF document text
    • https://xlux.vn/wp-content/plugins/super-forms/uploads/php/files/mvm8gakojpkgs02j1ff1lm7l2i/vawowidiwetigegafigad.pdfIn PDF document text
    • https://mavachhaiphong.com/upload/files/totuju.pdfIn PDF document text
    • http://ngoinvest.com/uploads/ckfinder/files/pipumezuxavuzonodebatoxe.pdfIn PDF document text
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/cd2f76a857fb614560de2762711e5913/98983811591.pdfIn PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/160840806caad9---94783748875.pdfIn PDF document text
    • https://artasedanasingaraja.com/uploadfck/file/25552585811.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=why+is+my+maytag+washer+stuck+on+rinse+cyclePDF 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_off0000f9ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9FF 11064 bytes
SHA-256: 4bff58f65d19e1bc9e842208bf94cf67e2921ff98e348a8c5aefa616d91addc1
font_01_sfnt_off000113a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113A9 16600 bytes
SHA-256: 8bd63116ba88b1c73af8276488eeaa7ac060a41e8f885e8f8c1b1ae74d86a173
font_02_sfnt_off00013e4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E4D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1