Malicious PDF — malware analysis report

Static analysis result for SHA-256 e7b2dc9e38f3b4a8…

MALICIOUS

PDF

77.5 KB Created: 2021-09-05 20:17:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 81f60e09cecfb9f4e4e82812a6af5896 SHA-1: b2bd1c0a6e1b0bdb3e83e8ba88c00b726a796387 SHA-256: e7b2dc9e38f3b4a8b2518ff3a61488539ba685240d7a265bfdb026400bf55edd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a large number of external URIs, many of which point to compromised or disposable domains, suggesting a link farm designed for SEO manipulation or to distribute further malicious content. No scripts were extracted, and the document body was unreadable binary data.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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://drcleancenter.com/uploads/files/202108180136211596.pdf In PDF document text
    • https://thinkhigh-tech.com/d/files/15497945266.pdfIn PDF document text
    • https://ytdrive.com/CKEdit/upload/files/podun.pdfIn PDF document text
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/1608db36ea81dd---36222277804.pdfIn PDF document text
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/61f4f085bd757cf0191760af2a9da550/wusibemijuvusigipuso.pdfIn PDF document text
    • http://frappsreagent.com/upload/files/57303703210.pdfIn PDF document text
    • http://korealabels.com/ckfinder/userfiles/files/69201953829.pdfIn PDF document text
    • https://maintogelonline2.com/contents/files/seboxo.pdfIn PDF document text
    • http://akcompany.vn/uploads/userfiles/file/kigegidatakakufa.pdfIn PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a132feaa9f3---wewosi.pdfIn PDF document text
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080e60163986---gedabekuxunamoxubiw.pdfIn PDF document text
    • https://relleno-acidohialuronico.com/wp-content/plugins/super-forms/uploads/php/files/637b8e73de0e2ef119948778767819f9/tinopelulodeluka.pdfIn PDF document text
    • https://fceresources.com/ckfinder/userfiles/files/pusojazakubovejume.pdfIn PDF document text
    • https://lightsourceindiana.com/wp-content/plugins/super-forms/uploads/php/files/1bbad7653ca37b8ece357e3b152ccaad/busime.pdfIn PDF document text
    • https://jclifeschools.org/wp-content/plugins/super-forms/uploads/php/files/d9655c6ef7a9be2b0fe8da458318b7f9/wosirog.pdfIn PDF document text
    • http://budaikepkeret.hu/uploads/file/kudax.pdfIn PDF document text
    • http://www.primalegal.eu/wp-content/plugins/super-forms/uploads/php/files/tils6ksa3pk8qqh0ecjcfak7b2/76961465239.pdfIn PDF document text
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094f1e33bcc1---bigolar.pdfIn PDF document text
    • https://canvasations.com/wp-content/plugins/super-forms/uploads/php/files/6e85udskf8ie65ig8dbfdgoe51/pefewuvomaliriralexadosi.pdfIn PDF document text
    • https://sonntag-immobilien.lu/userfiles/files/burufasavebexomagesekofo.pdfIn PDF document text
    • http://3dsami.org/uploadfilefiles/xomijuxilomojimi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=greenlee+hand+bender+pdfPDF 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_off0000ca4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA4E 18064 bytes
SHA-256: 8f5405eb0ff814164da481336936f69edca83945b63fe6622157f12f7b5e4691
font_01_sfnt_off0000f999.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF999 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000111b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111B0 10296 bytes
SHA-256: a951b2b6aa79688cb7daa1b50aed2872a48d4d062258a06e9da85d32acc0f8a8

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