Malicious PDF — malware analysis report

Static analysis result for SHA-256 d2f1703a6aab3cb4…

MALICIOUS

PDF

85.3 KB Created: 2021-08-16 20:35:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: ff9c8537026ffced9cfd1192fb1dfbd6 SHA-1: c68dc80fd64f1f7f74b376a14a1708a780e39659 SHA-256: d2f1703a6aab3cb4e21bf0655abedda11e7f913824e01e3bb7467108d074d2c5
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm or phishing lure. The ClamAV detection and ML classifier strongly indicate malicious intent, likely to redirect users to malicious content or phishing pages. No scripts were extracted, but the structure and URL patterns are indicative of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160ae589eaa380---dulokemo.pdf In PDF document text
    • http://aliceinformaticasrl.com/user/pages/27982382762.pdfIn PDF document text
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/96a40cb340ef142299d20aab461b43ea/66925173130.pdfIn PDF document text
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/s0hbvsr92raitimf0rpdgr4cnv/vojebotajixezix.pdfIn PDF document text
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160892119dfc38---80989677630.pdfIn PDF document text
    • http://josephfellerlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/wegisanejufapoz.pdfIn PDF document text
    • http://xn--b1akwe.xn--p1ai/userfiles/file/95228587193.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609875f18e530---43512598795.pdfIn PDF document text
    • http://pizzeria-millemiglia.de/app/webroot/img/editor/file/16473563833.pdfIn PDF document text
    • https://lerong.vn/wp-content/plugins/super-forms/uploads/php/files/f86078071c4583c8a14534cd5c7ddaeb/14433778260.pdfIn PDF document text
    • http://arcadia6465.com/clients/f/fc/fcac8d81e62e7f23ed02b02243def538/File/bamurarenu.pdfIn PDF document text
    • http://caphegiabao.com/upload/fck/file/24845851284.pdfIn PDF document text
    • https://fokusmedia.com/images/uploads/24761605029.pdfIn PDF document text
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160756fa12720f---lilis.pdfIn PDF document text
    • http://www.tlo.ntou.edu.tw/ckfinder/userfiles/files/27692142585.pdfIn PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a60b9b274e1---nijewazupurafiwogodox.pdfIn PDF document text
    • http://koszyczarek.pl/userfiles/file/kezivigedukekisu.pdfIn PDF document text
    • http://www.pro9apps.com/app/webroot/files/uploadimagesfile/47583871162.pdfIn PDF document text
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/g56l522ubt659avk5in9j7gq4m/nugotu.pdfIn PDF document text
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160ccd73b45113---domes.pdfIn PDF document text
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608046ade2c59---7731213957.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=why+is+my+xfinity+router+blinking+greenPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In 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_off0000e8d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8D5 16892 bytes
SHA-256: 07bd8c35c2b1508391c51493c0348547f2c889d8c20daa0b353c3d02784a0e89
font_01_sfnt_off00011533.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11533 11040 bytes
SHA-256: e38f55d78717c24281478b25620b97f91ce7a7266d72c05d2d28a89385a03114
font_02_sfnt_off00012eba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EBA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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