Malicious PDF — malware analysis report

Static analysis result for SHA-256 bdad5a451944006c…

MALICIOUS

PDF

78.4 KB Created: 2021-09-06 21:45:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: e96121349778aa84b48b0ec3477a8256 SHA-1: 454586d9213091dd69c4f46667b917beb659a627 SHA-256: bdad5a451944006c6ec717ebf1380a609d05d109273c31c0ba81a6358fa764a5
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous links pointing to compromised WordPress sites, indicating a likely phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, with the link farm serving as a lure or a distribution point for further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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.rkcomdesignservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073e2c538d59---41304030496.pdf In PDF document text
    • http://magnumprint.ru/upload/files/38303375627.pdfIn PDF document text
    • https://fastcomputer.vn/wp-content/plugins/super-forms/uploads/php/files/08378fdecd1a812bd3116a9d44fe78d0/mogemuraz.pdfIn PDF document text
    • http://technoauto.jp/js/upload/files/79750864796.pdfIn PDF document text
    • https://taksis.lv/taksis/userfiles/file/kutar.pdfIn PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608d199047fec---mowomuzakafunone.pdfIn PDF document text
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/160877b6226ec9---16624800879.pdfIn PDF document text
    • http://winfielddeli.com/ckfinder/userfiles/files/22184678114.pdfIn PDF document text
    • http://efrex.cz/files/file/35359037781.pdfIn PDF document text
    • https://sieuthigo.vn/upload/ck/files/xabiposaz.pdfIn PDF document text
    • http://constantemails.com/userfiles/file/16287678088293731972.pdfIn PDF document text
    • https://sip7.pl/autoinstalator/sip7.online/wp-content/plugins/super-forms/uploads/php/files/8e0b846496d404c32a58246e480dcb52/paxirifajikokuvoda.pdfIn PDF document text
    • https://windsbs.biz/files/file/46743598494.pdfIn PDF document text
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e328cc01b87---zemurosesa.pdfIn PDF document text
    • http://ceomit.com/fckupload/file/koxodidubazedagitupijo.pdfIn PDF document text
    • https://pikhospital.com/ck_uploads/uploads/files/56031042475.pdfIn PDF document text
    • http://lukinserv.hu/file/fagevujozaloxexitopa.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613534f87e15a---nozek.pdfIn PDF document text
    • https://bursakaynak.net/userfiles/file/fekebeviso.pdfIn PDF document text
    • http://gallery4walls.com/upload/editer/file/20644082975.pdfIn PDF document text
    • http://banhangcongnghe.com/upload/FCK/file/ninatetejabiwula.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=shimano+nexus+3+speed+shifter+manualPDF link annotation
    • http://pro.ovh.net/~tribuene/images/banque/file/gotap.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_off0000cbf7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBF7 11212 bytes
SHA-256: 056144c4a76de8aa5adfc247c81a2c8e5c0fe4d639a611b2a06c0ac522f4c450
font_01_sfnt_off0000e607.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE607 18300 bytes
SHA-256: c8618abb0b17e7eb0972e8824607b798f36495f6724d276fa7f7fe38be8a0e1e
font_02_sfnt_off000114bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114BD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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