Malicious PDF — malware analysis report

Static analysis result for SHA-256 d297b546ea07c5d8…

MALICIOUS

PDF

93.9 KB Created: 2021-07-13 19:47:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8d79560bd4001fbc46b6cacfb793407f SHA-1: 23315e405f444a5cacc87cc2853f930bdc714ad1 SHA-256: d297b546ea07c5d89ec66a635e58f50e8b4e181bcd997886d894d3c12ef0b755
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous embedded URLs, many pointing to compromised CMS uploads and disposable hosting, suggesting a link farm designed to redirect users. While no scripts were explicitly extracted, the nature of the URLs and the PDF format itself often implies the potential for embedded JavaScript to facilitate redirection or further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9929

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://www.zywawiara.pl/pliki/wisefititip.pdf
    • https://advancedcheckcashadvance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609adcb68734c---71326560515.pdf
    • http://fxmeat.com/upload/file/c97180329b10577aaae98f0a6a448192.pdf
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a9be84d3815---movokuxipomijiwunimulo.pdf
    • http://www.kzhep.in.ua/wp-content/plugins/super-forms/uploads/php/files/l9dvm7qopktuqf50asi2lkv152/26653109135.pdf
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160ca1be820e9a---texepibar.pdf
    • https://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/693a3238a6640496f2b2df9c7616346a/fonazom.pdf
    • http://drstevealbrecht.com/wp-content/plugins/super-forms/uploads/php/files/4aeac3087dd014515610358052e505e9/dogimevimigegewi.pdf
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/kn6shvil4rcmocjfisg44c1k16/73235083241.pdf
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16081f9f975485---tefewozipesomisajosatu.pdf
    • http://pusheng168.com/uploadfiles/20210623090622.pdf
    • http://www.aadhar-interior.com/userfiles/file/14984003634.pdf
    • http://studiotecnicolamanna.com/userfiles/files/bixizax.pdf
    • https://murten-hotels.ch/userfiles/files/wororudubaxuluwule.pdf
    • http://gongotour.com/FileData/ckfinder/files/20210616_3E2C09B3C0AC3B43.pdf
    • http://pulsarvn.com/media/ftp/file/75317086526.pdf
    • https://massagetheory.ca/wp-content/plugins/super-forms/uploads/php/files/321f6b18a66dea078d76ff9a5d987c00/gilese.pdf
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/5afvrbhvre122g964q45u542n7/18440356388.pdf
    • http://vhs1962.com/clients/b/b9/b967f936f519796c2a696a6ed1da67f9/File/91970381281.pdf
    • https://www.chesapeake-lighting.com/wp-content/plugins/super-forms/uploads/php/files/8b389d109fa12e7b12f1a7fd200f13b1/gatatedurazemogapodoveke.pdf
    • https://www.nhabe.com.vn/ckfinder/userfiles/files/guxabesupuzamidiroli.pdf
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/9f05b192c1e7f3c002219d5fb51a44fb/vanebaw.pdf
    • https://gw21.ch/uploads/userfiles/file/fuvosojubijumifipomow.pdf
    • https://beautyyaurient.com/editor_upload/file/zopumavorumitegajemigi.pdf
    • https://bulendengin.com/upload/ckfinder/files/65820762837.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=random+fever+and+chills
    • 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_off00010dbd.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10DBD 16792 bytes
font_01_sfnt_off000125d4.bin
12ce8df2126ef8bdeb97396243d5eaf59b97c34983cde05a9c1bb299650bf7c2
pdf-font-stream PDF embedded font (sfnt) at offset 0x125D4 10752 bytes
font_02_sfnt_off00013e50.bin
0c7a8580df77bb1c03636e98edf15f6f51229eed503442403a391c27fad813b9
pdf-font-stream PDF embedded font (sfnt) at offset 0x13E50 16744 bytes