Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c63500b2a883906…

MALICIOUS

PDF

87.1 KB Created: 2021-07-05 05:50:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4c7e7471eb5a9078aa50b78304d2e051 SHA-1: 2da4c202161362501a9982cc23d78f15c34ecafd SHA-256: 1c63500b2a883906d897489aceb6949eb2787471bf8d0a7b17e22bf15915ea86
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress upload storage, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. The file's structure and URL patterns align with techniques used to host malicious content on seemingly legitimate but compromised websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160ab57ed32e60---70865590860.pdf
    • http://gadkowski.pl/repository/filemanager/file/sikubin.pdf
    • http://vantaibactrungnam.vn/upload/files/fogimopoxalowatamuzizer.pdf
    • http://nesthomes.in/userfiles/file/52266715277.pdf
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a1703f44f93---7756167050.pdf
    • https://ngoctraithaibinhduong.com/uploads/news_file/bajimamaxoduwozazowu.pdf
    • http://lungshingcentre.com/userfiles/pifuwogefedi.pdf
    • https://xn--80adj7cxa.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/7406ca028edb9c2ac75d2e33dac52b70/61422460765.pdf
    • http://xn----8sbnbd9chja.xn--p1ai/userfiles/file/77295111526.pdf
    • http://amon-syotengai.com/userfiles/file/rexozubivo.pdf
    • http://xn--l3chcucnqd9c0eua7b1k.com/user_img/files/17561533670.pdf
    • http://alfavit.tv/userfiles/file/pesefu.pdf
    • http://hanleyresources.com/images/gopuxegorudigirilef.pdf
    • https://growmytruck.com/wp-content/plugins/super-forms/uploads/php/files/22e2adb9a61260bec62fd2b3b0e7516a/68870351399.pdf
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c99ff9084f---gilusepufebodi.pdf
    • http://sklepjola.pl/userfiles/file/betofoja.pdf
    • https://www.lindopoint.it/wp-content/plugins/super-forms/uploads/php/files/688e03793d99601593a36f8f1bacacc2/19725034022.pdf
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ae260340e57---jutamupaxaxotus.pdf
    • http://papianiarch.it/userfiles/files/pavitenavava.pdf
    • https://lsp.od.ua/wp-content/plugins/super-forms/uploads/php/files/0f7vkvd3cuh39r5m7s1jiiteb5/80759377926.pdf
    • http://legalinet.eu/userfiles/files/83891796440.pdf
    • http://fantalife.nl/userfiles/file/13918942264.pdf
    • https://xn--nmqu14inmf.com/upload/files/loxemo.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=songs+about+fishing+with+grandpa
    • 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_off0000f0d5.bin
340354a0fdc11f072134411c58dcbfa55916f2489b4773dbc2206b6a2e41fcf7
pdf-font-stream PDF embedded font (sfnt) at offset 0xF0D5 11000 bytes
font_01_sfnt_off000109fb.bin
8218cf9fd97037f57130ccf30dbc8da35b53ceb2e5cbbebce9e99e8981858759
pdf-font-stream PDF embedded font (sfnt) at offset 0x109FB 17716 bytes
font_02_sfnt_off000136fe.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x136FE 16792 bytes