Malicious PDF — malware analysis report

Static analysis result for SHA-256 fedc8fed6308d52b…

MALICIOUS

PDF

75.8 KB Created: 2021-09-23 16:44:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: f88961cd9bbe84d2d735222d5d52285b SHA-1: 2a5a4dcace6b86e5a494c547d56b53402abf66b3 SHA-256: fedc8fed6308d52b43f91abf2c351a3889b3ea29707f0c4a1a46e8b82e7024d0
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by a machine learning classifier and ClamAV, detecting it as a phishing trojan. Heuristics indicate the document functions as a link farm, containing numerous external URIs pointing to various websites, some of which are hosted on compromised CMS upload storage or disposable domains. This suggests the primary purpose is to lure users to potentially malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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://luatsuavina.com/userfiles/file/tobobutimajidiwep.pdf In PDF document text
    • http://www.electricman.in/demo/frontend/web/uploads/files/45488577556.pdfIn PDF document text
    • http://mevlanaasm.com/resimler/files/kaxizekenorazulegun.pdfIn PDF document text
    • https://gencatakan.com/upload/file/81473442918.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134bfa5946e8---pizowo.pdfIn PDF document text
    • https://dezsredstvompx.ru/wp-content/plugins/super-forms/uploads/php/files/fe089aacf1951b1cc53e6d1ba26c7a6d/97625571102.pdfIn PDF document text
    • http://kxqcgs.com/filespath/files/20210901225704.pdfIn PDF document text
    • http://signauction.net/userfiles/file/31845766957.pdfIn PDF document text
    • https://mahae.hu/files/files/827377225.pdfIn PDF document text
    • http://skrabl.pl/www/rpbd/fck/file/kilojelinovixebuwo.pdfIn PDF document text
    • http://mp-hd.de/data/aktualnosci_imgs/file/zonamojuzajupipesopo.pdfIn PDF document text
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143c2718bd22---sovuda.pdfIn PDF document text
    • http://www.hgekc.com/media/userfiles/file/67160830265.pdfIn PDF document text
    • https://marlschuz.com/userfiles/files/87978508067.pdfIn PDF document text
    • http://bradhelferlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/nazedudofob.pdfIn PDF document text
    • http://jobsmarttampabay.com/files/public/femeribujirenadezobemi.pdfIn PDF document text
    • https://gaadalagi.com/contents/files/tituxolika.pdfIn PDF document text
    • https://seeyounow.net/userfiles/file/68671456250.pdfIn PDF document text
    • https://sieuthigo.vn/upload/ck/files/32221406862.pdfIn PDF document text
    • http://xn----7sbndn5at.xn--p1ai/uploads/files/keridobel.pdfIn PDF document text
    • https://www.azulejositurry.com/wp-content/plugins/super-forms/uploads/php/files/d0fvg2jp7qrjs7nvlvlnlq3np5/kowirewewe.pdfIn PDF document text
    • https://lesartsdansmonjardin.com/userfiles/file/20210907160420.pdfIn PDF document text
    • https://elnativocoffee.com/silver/upload/files/80425267407.pdfIn PDF document text
    • http://aibasylhet.edu.bd/app/webroot/ckfinder/userfiles/files/lunogabupoguvalo.pdfIn PDF document text
    • https://rrr71.ru/upload_picture/83431781506.pdfIn PDF document text
    • http://stfurnimart.com/file_media/file_image/file/91358645374.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=experimental+organic+chemistry+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_off0000c34f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC34F 17140 bytes
SHA-256: 2e2b9fcf519472a8d3bd91c6534181d0971b6cdb17522081232ee89cb41037ae
font_01_sfnt_off0000eef5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEF5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001070c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1070C 11264 bytes
SHA-256: f989e0a3a8f0ab86fa931c43b20b7a531d9aaadd7274e3541d900b229b72b491