Malicious PDF — malware analysis report

Static analysis result for SHA-256 39c671b0c70488cd…

MALICIOUS

PDF

81.3 KB Created: 2021-09-02 12:13:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 726f9213a3fcde0001df2c0b7460f1d3 SHA-1: 96e665a23b9c580369666704ab14d3a8f95c3e09 SHA-256: 39c671b0c70488cd907d73655fc9c1ee6a439eb2d186f62484dfd79fe360f015
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm pointing to multiple disposable hosting domains, likely intended to redirect users to phishing or scam pages. While no scripts were explicitly extracted, the PDF structure and heuristic firings strongly suggest malicious intent via embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://atraba-holding.com/userfiles/file/ladimurewosoladoxi.pdf
    • https://acryl-bg.com/userfiles/file/xudijimiraxe.pdf
    • https://safrano.pl/userfiles/file/zifero.pdf
    • https://www.reflectionuk.com/wp-content/plugins/super-forms/uploads/php/files/nhi7m5pajtbnspd28eorj0i31c/xatuwosunepuzixi.pdf
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/1610c1868358bb---1942866693.pdf
    • http://heorungminhphat.com/luutru/files/duweduroz.pdf
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ee268bc1bb1---86131142369.pdf
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c05b62a33c9---borosesefimugegulijusurot.pdf
    • http://tuderprogettazione.it/userfiles/files/xebazupawigujewodijej.pdf
    • https://greenfuturevietnam.com/Upload/files/2997861309.pdf
    • https://stallion-international.com/userfiles/file/jaridumusutaxivotikeg.pdf
    • http://banghetretruc.com/media/ftp/file/61610738792.pdf
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/07e29f248a2ed34443831a92e4c77bb4/xusabumufarokorunesixudat.pdf
    • http://zhengfutz.com/v15/Upload/file/202162839118149.pdf
    • http://zxpgw.com/userfiles/file/67852347527.pdf
    • http://hyunbulsa.org/~ewedd2/userfiles/file/sotawudofumoxuridogaji.pdf
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608492a94a6c4---wutumedopazivo.pdf
    • https://canadiancontractorservices.com/wp-content/plugins/super-forms/uploads/php/files/hof5chlv62udirq0511lagv660/58466226809.pdf
    • https://keralatemples.info/ckfinder/userfiles/files/91083091357.pdf
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607dea32bba18---17020900876.pdf
    • http://salonorganica.ru/upload/files/98216813528.pdf
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d8e24242f5---2073930194.pdf
    • http://bjallstar.com/upload/file/zepukimutipageforurame.pdf
    • http://softwarefactory.nl/images/file/kapetexazadaroxoxokosir.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=manual+testing+test+cases+examples
    • 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_off0000d767.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD767 16792 bytes
font_01_sfnt_off0000ef7e.bin
22c8fcad95793eb2aa1ebea66820747d63e868818060c295ba9a9288efb2fabd
pdf-font-stream PDF embedded font (sfnt) at offset 0xEF7E 10692 bytes
font_02_sfnt_off00010800.bin
2ea27cc3ae3a33a874f12eda4f90201757de6199d7be14af2c70724f05d3ed0a
pdf-font-stream PDF embedded font (sfnt) at offset 0x10800 18328 bytes