Malicious PDF — malware analysis report

Static analysis result for SHA-256 c188b6f783bf7ae1…

MALICIOUS

PDF

83.7 KB Created: 2021-09-18 14:07:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 76125aa67b759bafc05e32a92f3a340d SHA-1: eb84d6564a7aca1c23fd5dce0119139b37fe744b SHA-256: c188b6f783bf7ae19e2845a9d0ee6ea3962c638b1ca49007a6ed4545b9c7cda5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF 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. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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=the+secrets+we+keep+sudeep+nagarkar+pdf PDF link annotation
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ea4c7ad397---70201128426.pdfIn PDF document text
    • http://ohxto.com/uploaded_files/userfiles/files/57585314635.pdfIn PDF document text
    • https://watertorens.nl/userfiles/file/84448565225.pdfIn PDF document text
    • http://sitoad.com/bbqjoekey/files/202109080437115791.pdfIn PDF document text
    • http://kdekdyjak.cz/data/21385016963.pdfIn PDF document text
    • http://eyela.kr/uploadfile/fckeditor/file/91862406670.pdfIn PDF document text
    • https://astoraccessories.com/uploads/ckfinder/files/59631931476.pdfIn PDF document text
    • https://smg.bid/ckfinder_userfiles/files/togazab.pdfIn PDF document text
    • https://ymy-tea.tw/upload/files/rezijilurofimana.pdfIn PDF document text
    • http://yourmoneyyourbank.com/uploads/File/89865872905.pdfIn PDF document text
    • http://www.terresdescaraibes.fr/file/58532177567.pdfIn PDF document text
    • http://branonperformance.com/ckfinder/userfiles/files/78246337803.pdfIn PDF document text
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1613448e65ee84---26459246379.pdfIn PDF document text
    • http://szyoujin.com/UploadFile/file/20210918120440521.pdfIn PDF document text
    • http://diskacme.dk/images/upload/file/92309088323.pdfIn PDF document text
    • https://global-brand.net/userfiles/files/53979600582.pdfIn PDF document text
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ace3d1092a---juwidezonokejojefabevuta.pdfIn PDF document text
    • http://dsacare.com/admin/uploads/file/94561707639.pdfIn PDF document text
    • http://zaragozalawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/reviwusuwusepakojani.pdfIn PDF document text
    • http://amindoost.ir/images/upload/files/lujapuzomi.pdfIn PDF document text
    • https://mannoorpally.com/uploads/file/xawipi.pdfIn PDF document text
    • http://tdjl.com/uploadfile/file///2021091716103082.pdfIn PDF document text
    • http://cleanking.net/userData/board/file/rubunevoduxinegav.pdfIn PDF document text
    • http://importfoodfair.com/userfiles/image/2021/09/file/rukikukapagoxugodarojuzul.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_off0000e16f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE16F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f981.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF981 17688 bytes
SHA-256: 0e5ea550675ab70447bd4f16ab4fb6ec5963ad036ef2da61198f7847f96e9ae1
font_02_sfnt_off000127c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127C9 10884 bytes
SHA-256: f83c1209f2f41f73b83b01f789eaf9d679047ade1d0b153a245a6142706ccbd6