Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb7eb54f75768b11…

MALICIOUS

PDF

69.2 KB Created: 2021-09-30 18:56:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 8dcb53309760483236c342b3e00400bb SHA-1: 827f1db240cca09b189a567f326ee764bc834f66 SHA-256: eb7eb54f75768b11fb881c7f1faf2159a1ab873e0a3465cbfd2222fbb6ff0119
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS upload directories, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, and the document body was unreadable, so the rationale is based on the URL heuristics and AV detections.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://tims.ro/ckfinder/userfiles/files/sobuvopirugalesemixabi.pdf In PDF document text
    • https://paron-rebondir.com/uploads/files/90810924227.pdfIn PDF document text
    • http://www.veslovani-vsb.cz/soubory/file/69819786194.pdfIn PDF document text
    • http://aspbae.org/userfiles/file/wudig.pdfIn PDF document text
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612eb1062e74a---pijedekagixixagikujana.pdfIn PDF document text
    • https://latgalesamatnieki.lv/files/file/54511748428.pdfIn PDF document text
    • https://greshamgilessalon.com/wp-content/plugins/super-forms/uploads/php/files/2b351c255862d06183fa4eb03a5bf0f5/79004871055.pdfIn PDF document text
    • http://letnipohar.cz/upload/file/kusafididopekadugetoluwu.pdfIn PDF document text
    • http://moscowballet.ru/userfiles/file/47249380820.pdfIn PDF document text
    • https://alemarferries.alemarsnp.gr/ckfinder/userfiles/files/gigoxalula.pdfIn PDF document text
    • http://firmykominkowe.pl/Obrazki/edytor/file/pozuzoguba.pdfIn PDF document text
    • https://borsalino.ro/imagini_ws/27149064790.pdfIn PDF document text
    • http://fuhua.tumujike.com/assets/upload/files/202109020950118420.pdfIn PDF document text
    • https://dhesient.com/media/52361120613.pdfIn PDF document text
    • https://www.vigo.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16143509465faa---karizobos.pdfIn PDF document text
    • http://behtarinekhodetbash.com/files/files/92471140685.pdfIn PDF document text
    • http://tridiart.cl/ckfinder/userfiles/files/xofusiniwewijevob.pdfIn PDF document text
    • http://sochisushi.nl/survey/userfiles/files/zobifenapo.pdfIn PDF document text
    • http://hotelbellevuepalermo.com/userfiles/files/28670193741.pdfIn PDF document text
    • https://mattress-leader.com/media/54109017783.pdfIn PDF document text
    • https://nevjegyzek.eu/uploads/file/dulugidizubisas.pdfIn PDF document text
    • http://hzeiger.com/userfiles/file/24519344470.pdfIn PDF document text
    • https://birudongker.com/contents/files/50205975938.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=android+6+block+numberPDF 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_off0000affe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFFE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c810.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC810 15396 bytes
SHA-256: 79a3f0dc43b3c8dd2b91209df471ff67c080c349929b57d604e6d02b99a24d07
font_02_sfnt_off0000ef2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF2D 10584 bytes
SHA-256: 9edcdbe58b3c5bb7383b41c68eb6504bb2f6eabd1eef8d535bb385c6a74174fa