Malicious PDF — malware analysis report

Static analysis result for SHA-256 0bbe561376d85948…

MALICIOUS

PDF

97.3 KB Created: 2021-06-27 22:53:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 77095d009f97228da8d3664de84e623e SHA-1: 11a4443b76be4a90a250decd0f783b0ee869340e SHA-256: 0bbe561376d85948b04b4db998323ae81ff401a895c0d24721a6f9f3a4653a8b
156 Risk Score

Malware Insights

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

The PDF contains numerous external URIs and link farm heuristics, indicating a strong intent to redirect users to malicious websites. The ClamAV detection and ML classifier further support its malicious nature, classifying it as a phishing trojan. No scripts were extracted, but the document structure and embedded URLs strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9930

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://synerhu.ru/uplcv?utm_term=norse+fires+epilepsy
    • https://luxurytravel-show.com/wp-content/plugins/super-forms/uploads/php/files/bf9ec9c6dfd5fa907cd96631f9ac487b/jixinuvabix.pdf
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160841374e631a---26862681162.pdf
    • http://akcjonariusz.com/UserFiles/file/87523027270.pdf
    • https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608e9e2f62498---77215389468.pdf
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/160c07cd03fc37---50044320952.pdf
    • http://casier-a-bouteilles.fr/file/58332661212.pdf
    • http://rauvuonsach.com/images/uploads/files/35415675731.pdf
    • https://baohohoanglong.com/userfiles/file/7308114768.pdf
    • http://cageart.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b2cb35aa74c---749126917.pdf
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160c4926535bc6---zabovopuw.pdf
    • http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4e2dd5c13c---57941822803.pdf
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075cc81b6e88---73682704498.pdf
    • https://wilsonbarrera.com/inicio/wp-content/plugins/formcraft/file-upload/server/content/files/160bab4ec707c0---46587487551.pdf
    • https://him-home.ru/wp-content/plugins/super-forms/uploads/php/files/c6a23aa11eeddf296655c7eeb37f8fe6/xotezuxuwabaxaxiguga.pdf
    • http://wsp.pl/userfiles/file/24880721046.pdf
    • http://ptk-astana.kz/wp-content/plugins/super-forms/uploads/php/files/f85ace403030681c09df7040892fdd92/25377570839.pdf
    • http://hanboo.cn/Uploads/file/2021052118302170554.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8ef563dda2---84145929937.pdf
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/160985ac7b042a---wutar.pdf
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16072d2f344371---warujeloxatavasub.pdf
    • http://africansafaris-spain.com/FCKeditor/editor/filemanager/connectors/php/connector.php?Command=FileUpload&Type=File&CurrentFolder=%2Ffile/tafuxaraduguw.pdf
    • http://www.zulfugar.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160741f193a2b0---guwevovosiritevoxo.pdf
    • https://www.engltg.com/wp-content/plugins/super-forms/uploads/php/files/ea1e10e244ebffea4b866d689fc5d5b9/zajuseta.pdf
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/f5beadf63b34947ecc56b8d5e439f69f/75534145888.pdf
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b5e75ab2f11---1868548623.pdf
    • 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_off000119f9.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x119F9 16792 bytes
font_01_sfnt_off0001320b.bin
e7d13c7b47d37ad0e455017e6348cd4472fe4ca03af59efb86795287fe0e8f69		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1320B 18520 bytes
font_02_sfnt_off00016261.bin
989a6432c3f8685f8dd2b830bf7570c044c1a4d0f142473e5680de4cf3c7184a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x16261 10080 bytes

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