Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d2c085677ad97a1…

MALICIOUS

PDF

75.2 KB Created: 2021-09-09 01:19:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: b26948e424302286e2bb44cf5090516a SHA-1: 4a1bcea63ac515d405c7191ad3db8d857c702028 SHA-256: 8d2c085677ad97a1723fa6806a6e6efc9da39c6a3dbcc35f1d084014029ac0f6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous URLs pointing to potentially compromised websites or disposable hosting, suggesting an attempt to redirect users to malicious content or phishing sites. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9827

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://inwebjor.ru/uplcv?utm_term=yts+movie+store+apk PDF link annotation
    • https://pottoka.info/files/galeria/files/7762609392.pdfIn PDF document text
    • http://www.cerel.eu/images/wyswig_images/file/fijiro.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/16133ab0eb3156---38854713104.pdfIn PDF document text
    • http://hzbmsj.net/images/upload/File/sopipufowekuso.pdfIn PDF document text
    • https://yellowstonewildlife.com/vuraba.pdfIn PDF document text
    • http://kerrya.com/ckfinder/userfiles/files/90158447731.pdfIn PDF document text
    • http://ledseoul.com/userData/board/file/wogumowepawuxapi.pdfIn PDF document text
    • http://teedinmaesai.com/user_img/file/xepumowewa.pdfIn PDF document text
    • http://jingluo.net/uploadfiles/files/8960996674.pdfIn PDF document text
    • https://appvid.eus/userfiles/files/xitoxunu.pdfIn PDF document text
    • http://orikon.net/Images_upload/files/65267241126.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/79e957b09cec679602e5fe6af4ed882f/57417971600.pdfIn PDF document text
    • http://wijnhuis-vaessen.nl/site/data/ws/files/83884441278.pdfIn PDF document text
    • https://www.clinicaepilepsia.cl/ckfinder/userfiles/files/90341356861.pdfIn PDF document text
    • https://produse-zilan.ro/files/fedefudogebigosekisas.pdfIn PDF document text
    • http://ambvetbrashersclavoghisu.eu/userfiles/files/9503770055.pdfIn PDF document text
    • http://thanhlapcongtykiengiang.com/upload/ck/files/29702843349.pdfIn PDF document text
    • http://tubelessons.net/cms_images/file/4386174018.pdfIn PDF document text
    • http://kliknetezde.cz/admin/obrazky/file/33808347299.pdfIn PDF document text
    • http://tai-group.com/upload/files/79480795425.pdfIn PDF document text
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/5f5555199b6e6855821d26b6137842f7/nidez.pdfIn PDF document text
    • http://warehousetraining.ie/images/91593125737.pdfIn PDF document text
    • http://sushinamu.com/uploads/files/75360062283.pdfIn PDF document text
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1612f9856c35cb---penugif.pdfIn PDF document text
    • http://baiduvpn.com/upload/files/11596118990.pdfIn PDF document text
    • http://www.lovebliss.tw/UserFiles/files/divulesolofabowabane.pdfIn PDF document text
    • http://qbcar.ru/ckfinder/userfiles/files/nesofumebidepekolakizi.pdfIn PDF document text
    • 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_off0000c099.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC099 10404 bytes
SHA-256: 7d3e908c552e4903d539a75887ee949653c44c0e7bb2c23709b26b68d0f6b4c0
font_01_sfnt_off0000d838.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD838 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f04a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF04A 18260 bytes
SHA-256: 156c79baf5995816b8090f4ce76dbb661527add71550e603da4cc998be73f978