Malicious PDF — malware analysis report

Static analysis result for SHA-256 cdd9dcddf3e265cc…

MALICIOUS

PDF

70.2 KB Created: 2021-09-30 17:27:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 8fde1269514d683a1c82266189625095 SHA-1: 416cf683b120da29b18dded66b8d70738cf1a5ff SHA-256: cdd9dcddf3e265cc95211743fc09b1648a6a8c735b48814f37db02a6e0dd789d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was identified as malicious by a ML classifier and ClamAV, flagging it as a phishing trojan. It contains a link farm pointing to multiple domains, including compromised WordPress sites, which are likely used to host malicious content or phishing pages. The presence of numerous links on disposable hosting and the use of UTM parameters suggest an attempt to obscure the true destination and potentially engage in SEO poisoning for malicious purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9909

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://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a49c1a67ac---vanalowidironijo.pdf In PDF document text
    • http://thepnguyentran.vn/media/ftp/file/17713708718.pdfIn PDF document text
    • http://darstin.com/userfiles/files/50713471781.pdfIn PDF document text
    • https://feng-shuiworld.com/userfiles/file/nuginokobubod.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/3998b73845dcce3b8c806f57211a4d88/nevokuwuke.pdfIn PDF document text
    • http://narnivet.com/userfiles/files/78971534839.pdfIn PDF document text
    • http://www.neoneofitou.com/ckfinder/userfiles/files/92414213466.pdfIn PDF document text
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/4k91h1bssgmk96ks5pqkokgimg/vasebewikar.pdfIn PDF document text
    • https://magnettoptan.com/upload/ckfinder/files/kumobuvedelofovin.pdfIn PDF document text
    • https://bagstyle.uz/images/file/rivibalosod.pdfIn PDF document text
    • http://etabetasurvey.com/userfiles/files/18640007786.pdfIn PDF document text
    • http://3wsystems.com/shipinc/userfiles/files/dipokisabiparikebajaxabik.pdfIn PDF document text
    • http://harchovyk.com/userfiles/file/bugifi.pdfIn PDF document text
    • http://www.thaiboat.net/image/upload/File/zuforiwuvew.pdfIn PDF document text
    • https://galedo.cz/www/data/cms_files/files/26752131961.pdfIn PDF document text
    • https://vietrocknet.org/app/webroot/img/files/tiwuzidawi.pdfIn PDF document text
    • https://skl68n15g-n2ox.com/contents/files/lotamavozuwupefa.pdfIn PDF document text
    • http://shepardinteriordesign.com/rw/upload/file/16167308312.pdfIn PDF document text
    • https://ph2020.org/ckfinder/userfiles/files/xodego.pdfIn PDF document text
    • http://zerosquareonline.com/file/sodede.pdfIn PDF document text
    • https://retrofitoman.com/ckfinder/userfiles/files/76435261359.pdfIn PDF document text
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/161529e1e3248e---fulase.pdfIn PDF document text
    • http://cadelupo.it/userfiles/files/5640065001.pdfIn PDF document text
    • http://puntolinea.org/userfiles/files/nutugewewojaganukivekene.pdfIn PDF document text
    • https://reklama71.ru/upload_picture/tufesewowiwoxinuwezurov.pdfIn PDF document text
    • http://jr.ac.th/ckfinder/userfiles/files/tevatapazir.pdfIn PDF document text
    • https://www.hinkler.com.au/application/third_party/ckfinder/userfiles/files/lekugepunagekaxanevosoze.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=how+to+know+wifi+password+in+android+phonePDF 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_off0000b5cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB5CF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cde1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDE1 14424 bytes
SHA-256: 6d69243ecacb6433e221783cde47a9774888bbb1c9ed38afcfe04e7d25a80731
font_02_sfnt_off0000f206.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF206 10716 bytes
SHA-256: 1dfa3209c2d5a16f4b127d45c35cb4299e250f534a3f2f1185c820b4d07eb199

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