Malicious PDF — malware analysis report

Static analysis result for SHA-256 5690ac0ff52c58a2…

MALICIOUS

PDF

79.0 KB Created: 2021-08-18 07:08:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 96b3214ef78607dfae6a7a99bdd6124e SHA-1: 19648bd7fb5ed729dfda0c8ebf17683ac9df18a5 SHA-256: 5690ac0ff52c58a2ba052821bdcc4f66e67a080ffdef1afbb8bb168e2a7ae075
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, suggesting a link farm designed to redirect users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9802

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
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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://huntic.ru/uplcv?utm_term=graphing+slope+intercept+form+word+problems+worksheet PDF link annotation
    • https://www.mysmilestudios.com/wp-content/plugins/super-forms/uploads/php/files/d0a349d462b1c45487540c2b656c4310/pixax.pdfIn PDF document text
    • http://gioiacompany.net/images/upload/file/ximilijuwedajijutezavu.pdfIn PDF document text
    • http://lammensfilip.be/uploads/files/wifiwenobujutisim.pdfIn PDF document text
    • https://copab.tn/216mag.svn/uploads/files/84911476953.pdfIn PDF document text
    • http://sieckultury.pl/wp-content/plugins/super-forms/uploads/php/files/a6b88807839e1064a6a260bedae24344/soluluzewenoxorox.pdfIn PDF document text
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610f0ec0b94cd---7550658154.pdfIn PDF document text
    • http://adacu.org/userfiles/file/20210611154801.pdfIn PDF document text
    • https://vhssirimpanam.org/ckfinder/userfiles/files/47688271997.pdfIn PDF document text
    • http://snap-drone.com/userfiles/file/situlokewevinobuki.pdfIn PDF document text
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160886eac228d9---52821167956.pdfIn PDF document text
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/160be5d0d4d94c---74713814436.pdfIn PDF document text
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ee34ac6ab90---jelofipelasukisubeji.pdfIn PDF document text
    • https://indacphuc.com/wp-content/plugins/super-forms/uploads/php/files/02nb0m79veeeeiff0vlhl3h845/63491439650.pdfIn PDF document text
    • http://www.marcelasemper.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608cf4e2bf546---sugigusufaganijegozozibut.pdfIn PDF document text
    • http://euro520.net/userfiles/file/1621351784313978504.pdfIn PDF document text
    • https://noticky.net/akce/fotky/file/66385729323.pdfIn PDF document text
    • https://pharmawell.eu/ckfinder/userfiles/files/zatawadanubujav.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e98078e2834---zawijifetufepibiwi.pdfIn PDF document text
    • https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/6fb9a1795983b212ca336d03fbfa605f/vurap.pdfIn PDF document text
    • http://cuacuonnhaxuongbinhduong.com/upload/files/nivipise.pdfIn PDF document text
    • http://psycare-spb.com/userfiles/file/87185094498.pdfIn PDF document text
    • http://vdadanang.vn/app/webroot/assets/files/4644975669.pdfIn PDF document text
    • http://turagent007.ru/userfiles/file/63286359670.pdfIn 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_off0000dd75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD75 11424 bytes
SHA-256: f4ea0bbe2c644b00eb6e649cbc8c67e2b904607eff48d7e0b671dcaee717ea4b
font_01_sfnt_off0000f7e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7E3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010ff5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FF5 16308 bytes
SHA-256: 5859801142c12b5b30fecf68d2c3e250909b5b6578bef4b4d6812017cede4860