Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3aca12e1fd3506a…

MALICIOUS

PDF

82.4 KB Created: 2021-09-07 08:50:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 6334f277d26b4c00ba8020e6e75bcab8 SHA-1: 12b6384f835fbed76901070b38004a3e3d241c59 SHA-256: b3aca12e1fd3506a5217bb2cb6ab26d22d67b51953624020606e4d36056aa472
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to multiple external URLs, several of which are hosted on compromised WordPress sites. This pattern is commonly used for phishing or distributing further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://rockyhotelsgroup.com/uploaded/files/tutagenonemorafasazave.pdf In PDF document text
    • https://zzwgjx.com/d/files/jedodefurumakinak.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1607bf9ab9b3b0---mezepebabidebude.pdfIn PDF document text
    • https://a2designbg.com/userfiles/file/31832410990.pdfIn PDF document text
    • http://baodieptailor.com/uploads/2021-07-13/images/files/kotamemuniwuru.pdfIn PDF document text
    • https://xn--80aaaglcftt5alesfkk7f.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/4811809ad5414546f8532c9e5dbe5ce9/tanijevobakij.pdfIn PDF document text
    • http://graciaindoutama.com/kingkong/userfiles/files/sakumemawamuxuw.pdfIn PDF document text
    • http://bigcool.net/webroot/img/files/xelazunigiverepeb.pdfIn PDF document text
    • https://triyoga-tv.ru/userfiles/file/7247499151.pdfIn PDF document text
    • http://www.asslar.de/downloads/33503861965.pdfIn PDF document text
    • http://unseenadventure.com/userfiles/file/66663808891.pdfIn PDF document text
    • http://dungcucaytrong.com/images/files/dexeporurexebuzixurane.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606d92c380c7d---99627733843.pdfIn PDF document text
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/16088a1c9a8985---zowatitajetujovosisixu.pdfIn PDF document text
    • http://614move.com/clients/4890/File/jazusugusikipuletedasajaf.pdfIn PDF document text
    • http://ukrainski-rosyjski.pl/userfiles/file/bevup.pdfIn PDF document text
    • http://paoladebenedetti.eu/userfiles/files/38164771037.pdfIn PDF document text
    • https://rireenfrance.com/images/upload/files/42998946629.pdfIn PDF document text
    • http://shinies.ru/img/lib/file/jelopafagokovasafariwepo.pdfIn PDF document text
    • http://ourconn.com/userfiles/file/202108210817523266.pdfIn PDF document text
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082a6fe59e44---dadisizefivoxapezik.pdfIn PDF document text
    • https://djhelaly.com/wp-content/plugins/super-forms/uploads/php/files/796516f530e0faa0179d60262e84545d/53570084593.pdfIn PDF document text
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/015d258fbdeeff9b1603f6e1e6333ddc/11134450592.pdfIn PDF document text
    • http://kystop.com/wp-content/plugins/super-forms/uploads/php/files/677a9fad3800f2f6fddf27a1a6d0d72c/jawaweto.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090cbced6c3a---3010371088.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=inno+di+mameli+spartito+pianoforte+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_off0000dc56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC56 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f46d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF46D 10612 bytes
SHA-256: 2dae8363491196fc86f57bbb28f96191bbfc2fbca03f9ee04752c8ea310f7e89
font_02_sfnt_off00010c98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C98 17764 bytes
SHA-256: a41829ac51d231d91cdbfd64e505cacd266206df3901a18a7025055f7dfe8009

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