Malicious PDF — malware analysis report

Static analysis result for SHA-256 d970e12c1196fd9b…

MALICIOUS

PDF

87.2 KB Created: 2021-06-30 03:47:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 2405d9ea21da0696ad79071a013f2902 SHA-1: 975242ba827e91bf423dff5153d3e4d88be70286 SHA-256: d970e12c1196fd9b1123422b546c6d4013ca2725d0a09401bac2755d76ade2b7
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised websites and disposable hosting, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. The document body is heavily obfuscated and unreadable, providing no direct content clues, but the heuristic firings clearly indicate the presence of malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://law.com.sg/wp-content/plugins/super-forms/uploads/php/files/0d968696a9ec8c98e925688ffb22b43c/pejexakodonovudore.pdf In PDF document text
    • https://abeess.com/userfiles/file/26230954509.pdfIn PDF document text
    • http://sieckultury.pl/wp-content/plugins/super-forms/uploads/php/files/f6c9c64b5dc9983d0480248c7d658086/konivafibofewa.pdfIn PDF document text
    • https://stalbeckers.nl/userfiles/image/file/61696244704.pdfIn PDF document text
    • https://www.masismarketing.com/wp-content/plugins/super-forms/uploads/php/files/70287dba43ddc6bacad0b05b396f46c8/lanofisovejomeragagegojaj.pdfIn PDF document text
    • http://brandnewgoods.net/userfiles/file/makasixi.pdfIn PDF document text
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b3e55ce63c3---xozotomolesoreb.pdfIn PDF document text
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/nd5dba5ags1t68l60tka5ain3t/40977197657.pdfIn PDF document text
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8cd050328e---42714068726.pdfIn PDF document text
    • http://banhangcongnghe.com/upload/FCK/file/58920891640.pdfIn PDF document text
    • https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160bc07c557e7d---dewobavoxodiserivozoki.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/1606cca17e344b---deramipudulenowopimazesu.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cdd8076c35e---dasikivojuxulazepul.pdfIn PDF document text
    • http://budaikepkeret.hu/uploads/file/4843473681.pdfIn PDF document text
    • http://pericosrentcar.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16081a962e4f79---nutotowedijaz.pdfIn PDF document text
    • http://inarchengineering.it/userfiles/files/nuxamulo.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/kt6pfvrv3tplgpm0qno1gdbpvm/74454748369.pdfIn PDF document text
    • http://viticoltura-enologia.com/file/87012020580.pdfIn PDF document text
    • http://bijverhoeven.nl/uploads/files/boputexedonuzoz.pdfIn PDF document text
    • https://mebelihome.ru/upload_picture/44140130640.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f856b68b2a---dudowopedarag.pdfIn PDF document text
    • https://marathonroller.com/userfiles/files/divela.pdfIn PDF document text
    • http://altelaw.com/uploads/image/file/gejolivirikum.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=dietary+fats+and+blood+cholesterol+levels+worksheet+answersPDF 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_off0000efe6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFE6 11072 bytes
SHA-256: 5950e020b52b7369d1d79d6fef35c4f8653ad2abc6badac987ee9985f501c2ea
font_01_sfnt_off000109b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109B7 16692 bytes
SHA-256: 0a448dedfa7fa318f757d943767b79213e5769035cec5f2289cf11d965f30cfd
font_02_sfnt_off00013515.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13515 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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