Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f235dca841527bb…

MALICIOUS

PDF

86.7 KB Created: 2021-06-28 00:17:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 90952a5e5b25e78cc08567c5f35ebe94 SHA-1: bbec30da207474bec5583facbb3494d7c36c66f4 SHA-256: 1f235dca841527bb636bf6b2e771eddee88d2dfd04ddbcb05ab1d8b77310aa6e
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to compromised websites, likely serving as a distribution point for phishing or further malware. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically highlights the non-clustered nature of these links on disposable hosting, reinforcing the malicious purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://westmoorclassof1965.com/clients/5/52/52ec68f2b927accf75267cb07bfcc891/File/46231764135.pdf
    • http://baaningdoi.com/file_media/file_image/file/58599520612.pdf
    • http://openendrep.com/userfiles/files/35809634931.pdf
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/16092cede93aaa---92704681312.pdf
    • https://djhelaly.com/wp-content/plugins/super-forms/uploads/php/files/0d7759ef080d4b58fc77cb11ec6b30ec/38321117081.pdf
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16088ae4c5d731---67023402744.pdf
    • http://kimbuunguyen.com/uploads/userfiles/file/kulabuzapap.pdf
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc83c3353a---pitenebaroku.pdf
    • http://rajskiewakacje.pl/userfiles/file/wanofetumerarixafam.pdf
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af4575dd840---xejotolunomuwajibekir.pdf
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160746d86bebab---58564836802.pdf
    • https://www.criteriainvest.com.br/wp-content/plugins/super-forms/uploads/php/files/4qgb0qd27u0ra0mmkqk8k47i71/juxadezizudutojixiderivod.pdf
    • http://findmecakes.com/userfiles/files/36388679025.pdf
    • http://bostonmentors.com/userfiles/file/sufepujidu.pdf
    • http://divorcefinance.nl/uploads//file/11468937530.pdf
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1608e27db189ab---94127325202.pdf
    • https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8f5d0e2a27---pupopazemimimaki.pdf
    • http://bestbuyfromindia.com/userfiles/file/32778892475.pdf
    • http://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/7a70b589c895aa9c3dc13bad003366a1/67701629738.pdf
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609421d5ee715---bagidijokoxasemom.pdf
    • http://alibabashipping.com/userfiles/file/62886459085.pdf
    • http://aaaexpressheating.com/userfiles/file/83633053759.pdf
    • http://diacritic.org/travel/app/webroot/img/files/4789638748.pdf
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607f4deb91c02---83842862494.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=mr+and+mrs+america+tour+dates
    • 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_off0000f04b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF04B 16792 bytes
font_01_sfnt_off0001085d.bin
f7a2a1b748ebec746b335b179fb8feb18c955ed284ac22627939407df49a4e3f
pdf-font-stream PDF embedded font (sfnt) at offset 0x1085D 17084 bytes
font_02_sfnt_off00013536.bin
d667f868554651ca4c9136fa60a033e6ccc15769692b86879bb53626f487715a
pdf-font-stream PDF embedded font (sfnt) at offset 0x13536 10576 bytes