Malicious PDF — malware analysis report

Static analysis result for SHA-256 b48ed70166a2aae7…

MALICIOUS

PDF

78.3 KB Created: 2021-06-26 22:08:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6f94b56f4cfff101595f826034b095b3 SHA-1: f3e445c61880e22a0595dbca720f4470032fc6fc SHA-256: b48ed70166a2aae7e0d9b00a1bfee1b8d054e10b9db981368f966e670db2c251
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It functions as a link farm, containing numerous URLs pointing to compromised CMS uploads and disposable hosting, likely to redirect users to malicious content. The embedded URLs and the PDF structure strongly suggest an attempt to lure users into clicking malicious links, consistent with phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://ahcxdq.com/uploads/file/091934328082.pdf
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c7a610636a---17456895458.pdf
    • http://ngpsusa.com/wp-content/plugins/super-forms/uploads/php/files/3fdg9hkldoqi97it0vh6iai1kp/figixuzuxigol.pdf
    • https://daleplumbinginc.com/wp-content/plugins/super-forms/uploads/php/files/72eeca8c84a979d8f58b6408e1678576/71760975435.pdf
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607e8abba507b---zerezem.pdf
    • http://parentini.it/userfiles/files/fapuwonefijixoxiduli.pdf
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac1496ead04---minobisalew.pdf
    • http://hzzxtl.com/UploadFile/file/20210616043206648.pdf
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bf97c24d10f---fezevumedipanuke.pdf
    • https://unicornproduction.gr/wp-content/plugins/super-forms/uploads/php/files/7c04b033dce6f8fac010bc1d7cd2e7be/88538030906.pdf
    • http://imhyuk.com/imhyukeditor/userfile/file/43089038763.pdf
    • https://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/4ilqv15hiv6i5915aispjpaed2/47755509463.pdf
    • https://vildmarksjagt.dk/userfiles/file/19495344578.pdf
    • https://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/329b6b5f16d4ce46aeab61940eeac8e8/81325829142.pdf
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc75d1f1055---viwoxofadilumoraru.pdf
    • http://whitefamilyreunion2020.org/clients/4/4c/4c64578d40ee165aaf486c9a1ef3309b/File/rolesedukejefomela.pdf
    • http://scheidenschiedam.nl/uploads//file/wafipoxalipov.pdf
    • https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/d5d6bfeabaebb8b7e61331bed2986d85/24210505579.pdf
    • https://bikidi.com/UpFiles/WebEditorFiles/file/pevudox.pdf
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a463553644c---pededovugupabejowoxutod.pdf
    • https://www.helmmsp.ca/wp-content/plugins/super-forms/uploads/php/files/b44b722417a6b82884b8b0b03c24cedb/74318393268.pdf
    • https://locoffice.ru/userfiles/file/90539357151.pdf
    • https://www.d-table.com/wp-content/plugins/super-forms/uploads/php/files/5c84da367c8dcfb30e1011d39032f820/matopanotodobazamasiruvol.pdf
    • https://fanaf.com/article_ressources/file/47728034892.pdf
    • https://areicon.com/images/file/33168807195.pdf
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606ccb6bd5719---47912162572.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=impala+lowrider+for+sale
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cfd7.bin
e82ab84d1a2dbbefd2c54543540158a4e3bd52fb924f1133203812607aba2354
pdf-font-stream PDF embedded font (sfnt) at offset 0xCFD7 17120 bytes
font_01_sfnt_off0000fc36.bin
aaaa0c77ca8804949902b034f249f2bc569e46b188f8051448d0223121987b4e
pdf-font-stream PDF embedded font (sfnt) at offset 0xFC36 10492 bytes
font_02_sfnt_off00011416.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11416 16792 bytes