Malicious PDF — malware analysis report

Static analysis result for SHA-256 2bcd699b1a2c6eb9…

MALICIOUS

PDF

98.4 KB Created: 2021-09-03 01:23:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: d5e3afdeaef232627aee23e6bf8536ef SHA-1: 51e7e707fe29676abce616083703e26ed0cb597c SHA-256: 2bcd699b1a2c6eb9a65d68e5246e77777b4b07e9cbc35f45644fd60dc16fc286
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The sample was identified as malicious by ClamAV and an ML classifier, with heuristics indicating it functions as a link farm. Multiple URLs extracted from the document point to compromised CMS upload directories and disposable hosting, suggesting an attempt to lure users to external sites. Although no scripts were explicitly extracted, the PDF structure and link farm nature strongly imply an intent to facilitate phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://world-housing.jp/ckfinder/userfiles/files/baxosivinop.pdf In PDF document text
    • http://mail-ex.net/userfiles/file/kakufamamigevapanefal.pdfIn PDF document text
    • https://churchofgodinjamaica.org/app/webroot/files/buvuxuxuwerokidiluvo.pdfIn PDF document text
    • http://aroma-es.site/yamituki-n/uploads/files/garabawenexawupezip.pdfIn PDF document text
    • https://alamansyria.com/userfiles/file/36948105401.pdfIn PDF document text
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160aa8f5aa6931---56977912921.pdfIn PDF document text
    • https://www.ideaklinikankara.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c87ab8828b---75709995222.pdfIn PDF document text
    • http://wecans.net/_UploadFile/Images/file/52234351804.pdfIn PDF document text
    • http://ssaisarang.com/ckfinder/userfiles/files/83125504331.pdfIn PDF document text
    • https://kaxtongroup.com/home5/maxconne/public_html/kaxtongroup/assets/images/newspostimages/files/vufuwogisofe.pdfIn PDF document text
    • http://adamshs-pdx.com/clients/d/d3/d3c120c733f7363e2cdaef2cff5f3687/File/davoroxediroxo.pdfIn PDF document text
    • http://ctkupavna.ru/upload/file/ninufofotiwowifawi.pdfIn PDF document text
    • https://cultureresortpokhara.com/assets/userfiles/files/65026738796.pdfIn PDF document text
    • http://aodaibooking.com/FileData/ckfinder/files/20210808_F800BDCB3601E741.pdfIn PDF document text
    • http://asesorgubernamental.com/images/file/tibivazame.pdfIn PDF document text
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/16075c244ea13f---sagedef.pdfIn PDF document text
    • http://shiksha24.com/userfiles/files/8401651950.pdfIn PDF document text
    • http://prefinancovaniehypoteky.sk/res/file/89938303434.pdfIn PDF document text
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16075d9e843d03---bivajamapoza.pdfIn PDF document text
    • https://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/f36b8a9d569b64bd76ea5a2b96d49124/91928492671.pdfIn PDF document text
    • https://tepihtrava.rs//files/durajujatopoxojijefe.pdfIn PDF document text
    • http://digilit.ir/basefile/digilitir/files/30027093984.pdfIn PDF document text
    • https://tocgia247.com/wp-content/plugins/super-forms/uploads/php/files/8hsdf0s5l40g9jrn2il1kskus3/99143249612.pdfIn PDF document text
    • http://kartywspomnien.pl/uploads/assets/file/43949775058.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=moedor+de+caf%C3%A9+manual+com+regulagemPDF 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_off000114ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114CE 21412 bytes
SHA-256: bde4d42d4d43d5e78846f9d56995c2902b6da00df5bd81b130f9137681739c8a
font_01_sfnt_off00014971.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14971 10708 bytes
SHA-256: 5c7bfd63bd7a229973611f68b90419a911238321136660158fc483be17d195b1
font_02_sfnt_off00016178.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16178 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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