Malicious PDF — malware analysis report

Static analysis result for SHA-256 67c70b64f01518b0…

MALICIOUS

PDF

82.4 KB Created: 2021-09-10 09:37:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 040ead35854e1d7912ed0b4d27800a03 SHA-1: 60f16e9ab6cbe4de1fa2b37a09f3a8da811f908b SHA-256: 67c70b64f01518b0dab06ca1e4a0d2404306a75510841da837b767bfdece086b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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 https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/4b61dc16d2a5eb46a16f97251ecadaa7/99151090497.pdf In PDF document text
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/161320cbdb98ec---33960841638.pdfIn PDF document text
    • https://dcimx.com/files/nesexadanoripunebiporelu.pdfIn PDF document text
    • http://www.ecvbrass.ch/user/web/file/32114081299.pdfIn PDF document text
    • http://cuathepvangohaiduong.com/images/ckeditor/files/xowigutit.pdfIn PDF document text
    • https://charterfori.ir/basefile/charterforiir/files/momivaratizefawog.pdfIn PDF document text
    • https://nsck-cykelmotion.dk/userfiles/file/74314577537.pdfIn PDF document text
    • http://thanhcongtechtra.com/upload/files/meguzipatov.pdfIn PDF document text
    • http://palyavalaszto.hu/teszt/upload/file/gigusuv.pdfIn PDF document text
    • https://fleschimmo.lu/userfiles/files/lopiva.pdfIn PDF document text
    • http://luxcottage.ru/stroykamen/userfiles/files/wigaseko.pdfIn PDF document text
    • http://tea-ra.com/user_data/upload/save_image/files/nonarapasisajifubama.pdfIn PDF document text
    • http://scandirent-new.ru/uploads/assets/file/2233745357.pdfIn PDF document text
    • https://asiapharma.la/files/files/ponetidugetowidu.pdfIn PDF document text
    • https://akvanova.ru/sites/default/files/35908244141.pdfIn PDF document text
    • https://sitarasign.ir/data/file/zavesimizokijakede.pdfIn PDF document text
    • https://inprovitchile.com/ckfinder/userfiles/files/vipulewosasofezin.pdfIn PDF document text
    • https://doellefjelde-mussemarked.dk/images/newsmail/file/vagipotimepurofadunima.pdfIn PDF document text
    • http://vietsaovang.com/uploads/userfiles/file/73053414982.pdfIn PDF document text
    • https://marwaautorepair.com/nbloom/fckuploads/file/jezoxupa.pdfIn PDF document text
    • https://aodaixuan.vn/app/webroot/upload/image/files/73254810705.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16131b97893443---96004291169.pdfIn PDF document text
    • https://www.andreivieru.com/ckfinder/userfiles/files/77514823918.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=cara+transfer+data+whatsapp+android+ke+iphonePDF 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_off0000de92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE92 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f6a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6A9 10756 bytes
SHA-256: 1a477de6c8bb5bfe9772fa44e88b01fabdd11c98ce6785bcc2fd60208c4b58e5
font_02_sfnt_off00010f6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F6B 17256 bytes
SHA-256: 2e5e80de5b1a1dba832c583dc20439ff88750431b31f89fb394f0f4ac625f31e