Malicious PDF — malware analysis report

Static analysis result for SHA-256 774141abc6309f12…

MALICIOUS

PDF

81.0 KB Created: 2021-09-17 10:15:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 2e21f24e75275c8b5293648d16c9cef0 SHA-1: 9e3618d7b6f0c6b83de2bd96731cf148e036a22a SHA-256: 774141abc6309f12e016ffc326291278538b72cf1198e2a3388bdca96272f50d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ML classifiers and ClamAV as malicious. It contains multiple links to external websites, including one that appears to be a lure for a mobile device update. The PDF also leverages a compromised WordPress upload storage, suggesting an attempt to host malicious content or redirect users to phishing sites. No scripts were extracted, but the overall structure and URL patterns are indicative of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 https://oniceh.ru/uplcv?utm_term=galaxy+m31s+update PDF link annotation
    • http://shiokuda1.com/contents/files/33805465939.pdfIn PDF document text
    • http://meadescafe.com/userfiles/file/2780549222.pdfIn PDF document text
    • http://progetec.org/userfiles/files/maxafodedozuxowifo.pdfIn PDF document text
    • http://lejuriste.ru/files/file/49228135855.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613417821ec90---redivejekix.pdfIn PDF document text
    • https://pass-eco-energies.com/ckfinder/userfiles/files/vuzolasivedudenud.pdfIn PDF document text
    • http://www.megasaludips.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f3d6e633c8---tuwipatofojel.pdfIn PDF document text
    • http://macabrey-luthier.fr/data/Files/1487172819.pdfIn PDF document text
    • https://badanie-wody.pl/galeria/file/javepepisetefafo.pdfIn PDF document text
    • https://anbuadidravidarmatrimony.com/ckfinder/userfiles/files/sosaruwigideponolif.pdfIn PDF document text
    • https://himalayanthailand.com/image/upload/File/41166615419.pdfIn PDF document text
    • https://mttrasportisrl.it/dati/upload/file/35749801983.pdfIn PDF document text
    • https://svenjakretschmer.com/ckfinder/userfiles/files/japafegugamisevarimuzugo.pdfIn PDF document text
    • https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/16140eb74c8c62---81691050007.pdfIn PDF document text
    • http://liqaa-lb.com/files/userfiles/files/20964932856.pdfIn PDF document text
    • http://terezszilvia.com/images/uploaded/file/tonuwado.pdfIn PDF document text
    • http://l-max.ru/userfiles/file/57571911921.pdfIn PDF document text
    • http://chaukitchen.com/uploads/files/85343172290.pdfIn PDF document text
    • http://hjhchem.com/upload/files/muzakuxozuzubi.pdfIn PDF document text
    • https://www.luxboss.com/ckfinder/userfiles/files/30927296435.pdfIn PDF document text
    • https://cfi-registration.amyhalter.com/buzzboxgift/img/userfiles/files/74340390700.pdfIn PDF document text
    • http://location-appartement-venise.com/italie_documents/files/zabebum.pdfIn PDF document text
    • http://www.abcklima.hu/data/editorfile/84162127855.pdfIn PDF document text
    • 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_off0000d711.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD711 17876 bytes
SHA-256: 632bad79a8494f5bf8cb47af5760233a148f0e89e65e89389ffd8c990d1b7738
font_01_sfnt_off00010595.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10595 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011dac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DAC 10716 bytes
SHA-256: a7266774e47cd6ae1d13b7e3aa2610972493fefc15d7c2f9d48b2959a0727892