Malicious PDF — malware analysis report

Static analysis result for SHA-256 f81c46b6c0a7ca82…

MALICIOUS

PDF

76.4 KB Created: 2021-09-05 19:26:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: bffcd0fbe3b7afaedeefb0e198da6bba SHA-1: 15d965691a60907547388d86789685d650255cfe SHA-256: f81c46b6c0a7ca82059c753d93cad077f46200b5f3ff55962888393bc57fad01
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm containing numerous URLs pointing to PDF files hosted on compromised CMS uploads, suggesting a phishing or malware distribution scheme. The document body was unreadable, but the presence of multiple links to potentially malicious PDFs on compromised sites strongly supports a malicious attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://iwish-cosmetics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c6d69c2095---11111093357.pdf In PDF document text
    • https://quangcaomattroi.com/uploads/news_file/wisifalagu.pdfIn PDF document text
    • https://jobtiara.com/files/files/femawitak.pdfIn PDF document text
    • https://tasivn.com/upload/ck/files/vanuzelej.pdfIn PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096f1c4228bb---xanelavapikiteretobodonum.pdfIn PDF document text
    • http://riversedgefm.com/files/file/17377948886.pdfIn PDF document text
    • https://www.stamfordtaxis.com/wp-content/plugins/super-forms/uploads/php/files/h36743ig5cgnb6bu552e3akfjs/25478437118.pdfIn PDF document text
    • http://chipublichouse.com/ckfinder/userfiles/files/99555200288.pdfIn PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072368bb172e---misexuzoveg.pdfIn PDF document text
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076a2be99a6d---64341693332.pdfIn PDF document text
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160d5f5586ed02---94780310071.pdfIn PDF document text
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/160bc7382619d3---pezozegi.pdfIn PDF document text
    • http://palyavalaszto.hu/teszt/upload/file/5366726486.pdfIn PDF document text
    • https://norservis.info/files/files/17778110349.pdfIn PDF document text
    • https://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/8647da0d725bf0f98b6d737d055dc52d/89075007752.pdfIn PDF document text
    • https://tatsolarlight.com/uploads/files/98910868238.pdfIn PDF document text
    • http://starwindows.ie/ckfinder/userfiles/files/6880259327.pdfIn PDF document text
    • https://socialacademy.gr/wp-content/plugins/super-forms/uploads/php/files/250ae2188a78949673156400a3288685/17631662472.pdfIn PDF document text
    • http://novosib-sport.ru/ckfinder/userfiles/files/riwibafuguxaramuvuputuz.pdfIn PDF document text
    • http://dgjinhak.kr/DATA/upload/files/202105291210333866.pdfIn PDF document text
    • https://vinisfarm.com/wp-content/plugins/super-forms/uploads/php/files/0ced42aa3d6fe70d729e4caedfda144a/mevipirifuxunijakikiwu.pdfIn PDF document text
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ede762bc31f---73036897369.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=estenosis+pilorica+adulto+pdfPDF 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_off0000c42a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC42A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dc41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC41 10696 bytes
SHA-256: 6c7357974912d253de369751ffb8cce8d0dcab53d4bc91cfca6d0236c28e1bba
font_02_sfnt_off0000f4e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4E4 18640 bytes
SHA-256: e31e6b32e616078c0ed263cfb84173649f0fe246e5f64261d291d1866403d4f1

Open this report in the interactive analyzer, or submit your own file for analysis.