Malicious PDF — malware analysis report

Static analysis result for SHA-256 719a06630274acd6…

MALICIOUS

PDF

86.3 KB Created: 2021-07-05 16:09:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9f1cd1f1693e68f2b10b0dd97d66e6e1 SHA-1: 4d69f85ef2183edad38ef53b871e449ddb0aaead SHA-256: 719a06630274acd6dfe90ed01510564b2d90d92ed399c9a0dc8ed10617cbe478
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, with several pointing to potentially compromised CMS upload directories and disposable hosting, indicating a link farm for redirection. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9832

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://jucal.es/images/file/nakujuramiji.pdf
    • http://allnatureint.com/userfiles/file/wosidisilixudodagub.pdf
    • http://art-lan.ru/uploads/assets/file/pesizopefametudowexot.pdf
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c79404c24b---25543925511.pdf
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160983eaa07310---vipetovugesanabifi.pdf
    • http://math-talk.kr/wp-content/plugins/super-forms/uploads/php/files/cof5eubqv7q02hbrdil8s0ni9s/zisolesuziloromejo.pdf
    • http://xn--9d0b102a6wc3y4a.com/sa_upload/userfiles/file/20210627005629.pdf
    • https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/fbrc5e7ku8ctod7b2mlke9t8ko/gunatijiruzaziwikozi.pdf
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b04541d4d25---38777076211.pdf
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/1607a524a8bf57---88740869786.pdf
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/94ke4bhog4h9p1o8hukcv8g0nb/fudinew.pdf
    • https://nutricionintravenosa.com/wp-content/plugins/super-forms/uploads/php/files/d76e247d0b0b6af36cb0c50151c55686/12077041589.pdf
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609a2d8572604---27135950256.pdf
    • http://c2mag.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f6dafb6b48---taveberijenozawez.pdf
    • http://hnkingdee.cn/Files/file/2021624113016.pdf
    • https://terminal.hr/userfiles/file/88766804060.pdf
    • http://spoanalyze.com/wp-content/plugins/super-forms/uploads/php/files/5fd5e66ca946fede21b8e1e3372a4d3e/mosor.pdf
    • https://bayardplaza.co.uk/wp-content/plugins/super-forms/uploads/php/files/0m4gf67i43hrute6gkilkb77cj/duxurozeni.pdf
    • https://etre-cheval.fr/Applications/MAMP/htdocs/etre%20cheval/news_pix/file/9067705230.pdf
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160817c38b799d---87112310535.pdf
    • https://luxartparquet.com/wp-content/plugins/super-forms/uploads/php/files/ed0c069459b89582d3b276f62b4cc19b/gujarikimomenetug.pdf
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dc7f121636---81197612433.pdf
    • http://pcwenhua.com/uploadimg/file/1622609417653749243.pdf
    • http://alnadaoil.com/userfiles/file/43758696216.pdf
    • https://www.ideaklinikankara.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9fd879e9f---4104510787.pdf
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160941d3d201b4---6687242821.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=lines+and+angles+grade+7+worksheet
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eace.bin
a30fed43455f42e9adc72151f68bec4647f1b31a7ae5993e2b7da9bd2909d781
pdf-font-stream PDF embedded font (sfnt) at offset 0xEACE 10712 bytes
font_01_sfnt_off00010338.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10338 16792 bytes
font_02_sfnt_off00011b4a.bin
72e5f01be8e8c7a550b73a0e3fd4ed4aba0d72f091ff41d3d3fca5ebd0f34919
pdf-font-stream PDF embedded font (sfnt) at offset 0x11B4A 17792 bytes