Malicious PDF — malware analysis report

Static analysis result for SHA-256 18562919bae9a21f…

MALICIOUS

PDF

81.0 KB Created: 2021-09-09 22:51:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: eb115027c56f15bb7a86dc17a7d75145 SHA-1: a02e75d97121dfdaa4b3dca3a0219f5d558fa8fb SHA-256: 18562919bae9a21fca02f347a63da1525c96479cf3e2516d2cebd2345222241d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ClamAV as a phishing trojan. It contains embedded JavaScript and a large number of external links, many pointing to potentially compromised or disposable hosting. The presence of JavaScript suggests an attempt to execute malicious code, likely for downloading additional payloads or redirecting the user to phishing sites. The link farm behavior is indicative of SEO poisoning or distributing malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://agcslohian.com/userfiles/file/jigigulo.pdf
    • http://abwingsva.com/uploads/files/juxezak.pdf
    • http://jiangsutravel.kr/userfiles/files/20210908_191837.pdf
    • http://ilksolar.com/Images/Media/files/2290882725.pdf
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138fb803b6bb---5609985674.pdf
    • http://auto-rad.pl/userfiles/file/77043347144.pdf
    • http://beauty214.com/uploads/files/202109080349433668.pdf
    • http://yule-sign.com/upload/editor/file/20210909082601.pdf
    • https://stef-nancy.fr/upload/document/jaroxenagogar.pdf
    • https://coherence.cz/userfiles/file/15887503505.pdf
    • https://sushixusa.com/userfiles/files/81750913414.pdf
    • https://haps.company/wp-content/plugins/super-forms/uploads/php/files/a2eb9e470c042725c6b2e68c9f5273a0/lopopisujo.pdf
    • https://goldgreiner.de/userfiles/file/88371179193.pdf
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/c23370782666f877ab797403017c4415/losat.pdf
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/28875f05a8db69b2810073371ef1ffce/zukakuwajamikenimuw.pdf
    • http://kaizousha.com/js/upload/files/19348949818.pdf
    • https://superpart.com/files/75776213376.pdf
    • http://trunglam.vn/uploads/userfiles/file/jifoxam.pdf
    • http://architects-desk.com/uploadsfile/fozifojuduvogibuvimopot.pdf
    • http://salonorganica.ru/upload/files/parejim.pdf
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/161386d7092097---24351052109.pdf
    • https://cli-kh.com/uploads/files/202109040926075308.pdf
    • https://www.shamshabaddiocese.org/files/js/ckfinder/userfiles/files/112199331.pdf
    • http://mmprogetti.it/userfiles/files/95587308499.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=lego+jurassic+world+free+apk
    • 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_off0000d7a1.bin
dfab0fa1073710c3d24e4bc8eac774e85b339f68dcf03ea52a5b92589fff7ec0
pdf-font-stream PDF embedded font (sfnt) at offset 0xD7A1 17596 bytes
font_01_sfnt_off000104e8.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x104E8 16792 bytes
font_02_sfnt_off00011cff.bin
7b6ff2088931dd51fa7414f9d0dc3e3aca977acca0b51c035b73eeb2d0c59816
pdf-font-stream PDF embedded font (sfnt) at offset 0x11CFF 10956 bytes