Malicious PDF — malware analysis report

Static analysis result for SHA-256 ebf7ea1e3b2cdbb7…

MALICIOUS

PDF

69.7 KB Created: 2021-09-01 15:27:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: a3f8c187fcf4a7e6bb8e6f8f2cfc2201 SHA-1: 93b85bf6dd3345edfc7de56afbacc34293321972 SHA-256: ebf7ea1e3b2cdbb7c82388489e3ee05f14b2677f3ca3fb747f2e127f9b65d60d
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document is identified as malicious by multiple heuristics and a machine learning classifier, with ClamAV also detecting it as a phishing trojan. The document employs an image-based lure, typical of phishing, and contains a large number of links pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to redirect users to malicious content. Embedded JavaScript streams are also present, likely used to facilitate the redirection or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 69 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/vqpe20g25tvh8rerp7ibcrkbo1/70706569252.pdf In PDF document text
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/7b75aeio12te26du617gqj43m5/wofewa.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa5c48caf50---gelolusutixabefof.pdfIn PDF document text
    • http://sherylrobphotos.com/clients/56056/File/24318155299.pdfIn PDF document text
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160812eda2dd75---83357939679.pdfIn PDF document text
    • http://massimosusto.eu/userfiles/files/14615176423.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609408a8c2324---kekigelonofaga.pdfIn PDF document text
    • http://uleshuzatshop.hu/files/file/lisadoba.pdfIn PDF document text
    • https://asfus.net/virgsurv/userfiles/file/tubafivadabiruzudojida.pdfIn PDF document text
    • http://flightshop.jp/images/blog//file/77592154781.pdfIn PDF document text
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16114bcf1d96ea---wudewotabinujaperapa.pdfIn PDF document text
    • http://virus-safe-zone.com/ckupload/files/67914094560.pdfIn PDF document text
    • https://amerismithenterprises.com/wp-content/plugins/super-forms/uploads/php/files/f7ac3f6c30e06d278f180bdb09f420cb/99070033959.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608916238e8fa---64184930408.pdfIn PDF document text
    • http://quickvideo.nl/userfiles/file/39904591333.pdfIn PDF document text
    • http://daegyung.kr/userfiles/file/20210725100110.pdfIn PDF document text
    • https://alubiasdetolosa.com/files/galeria/files/15437224127.pdfIn PDF document text
    • https://www.colegiodomus.com.br/js/ckfinder/userfiles/files/95746713603.pdfIn PDF document text
    • http://atel-j.nl/uploads/files/4575970010.pdfIn PDF document text
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f978e8b15ca---43133987131.pdfIn PDF document text
    • http://pokwuttibut.com/file_media/file_image/file/dawixuxefik.pdfIn PDF document text
    • http://bezagsecurity.cz/userfiles/46479878429.pdfIn PDF document text
    • https://x-leather.com/radsportfiles/file/xezelesolonagifip.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=waves+with+a+fadePDF 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_off0000b796.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB796 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cfa8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFA8 13844 bytes
SHA-256: 01dbfe482d36c76d8220b674d1d65592715c363ca5335cf8a2ca2afbb9f0bfa1
font_02_sfnt_off0000f18c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF18C 10224 bytes
SHA-256: c68327837d608968b791f599b28373c30291f64a0aa209efa59af18e11c2798d

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