Malicious PDF — malware analysis report

Static analysis result for SHA-256 ecdde3f71a68fd7a…

MALICIOUS

PDF

71.0 KB Created: 2021-09-14 05:02:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 0d9305b615c32fa44ba6597b61c080fc SHA-1: 7078d51401fbf1446f8d3cebf5c65b825512423a SHA-256: ecdde3f71a68fd7a267a85d45a84a09bbf82464f4a6d993bd7572ea5e4332726
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to compromised CMS upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to phish users or redirect them to malicious sites. The document body is unreadable, but the heuristics and URL analysis are sufficient to determine the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://advairtech.eu/assets/userfiles/file/27463517304.pdf In PDF document text
    • http://adams-gold.ru/archive/image/file/rupor.pdfIn PDF document text
    • http://doorsatyrau.com/ckfinder/userfiles/files/94079736779.pdfIn PDF document text
    • http://villaturri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613478fa2b534---54492737404.pdfIn PDF document text
    • https://groupekheidri.com/ckfinder/userfiles/files/92861514768.pdfIn PDF document text
    • http://dongamold.com/fckeditor/upload_files/file/lugudijirelanuketa.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/16132d01e49379---tizivafakepunatajimuvibu.pdfIn PDF document text
    • http://a1climbing.com/userfiles/files/ronopazebivikasutupavika.pdfIn PDF document text
    • http://chieusangducphat.com/uploads/userfiles/file/97612051988.pdfIn PDF document text
    • http://stonepigments.com/userfiles/file/xoxofafawajawanunakilirop.pdfIn PDF document text
    • https://mayxaydungthienlong.com/uploads/files/files/19117459065.pdfIn PDF document text
    • https://beyondpins.com/calisma2/files/uploads/48395725314.pdfIn PDF document text
    • http://ros.by/ckfinder/userfiles/files/75099837362.pdfIn PDF document text
    • https://chambres-hotes-aube-bleue.fr/userfiles/file/81732920254.pdfIn PDF document text
    • http://baugeraeteverleih.de/benutzerdateien/63644879239.pdfIn PDF document text
    • https://cleartunemonitors.com/ckfinder/userfiles/files/tafuvenopinag.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/19241563955.pdfIn PDF document text
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/1612f7d8b1e6cc---belujorevakuxojulo.pdfIn PDF document text
    • https://bselink.com/userfiles/file/pelagakuvakakepedikizirin.pdfIn PDF document text
    • https://nullemont.fr/nullemont/ckfinder/userfiles/files/20453052195.pdfIn PDF document text
    • http://abwhopewell.com/uploads/files/26980848287.pdfIn PDF document text
    • http://camel-republic.com/media/userfiles/files/kavag.pdfIn PDF document text
    • https://chambredhotes-savoie.com/ckfinder/userfiles/files/18035308434.pdfIn PDF document text
    • http://zoltysnieg.pl/pliki_wyswig/files/84547851874.pdfIn PDF document text
    • http://chroscina.com/userfiles/file/77784513959.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=velocity+time+graph+curvePDF 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_off0000b604.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB604 15592 bytes
SHA-256: 532e7e5bda24b75f8283d4f11bba6ce6c352006900b0b2227c1bcc6ec10c06f3
font_01_sfnt_off0000ddd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDD3 10800 bytes
SHA-256: e830ede4d10f209267def94d7bb9d011fca46a7e67b21b3951409665b2375203
font_02_sfnt_off0000f6c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6C0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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