Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8adc8132dd8317c…

MALICIOUS

PDF

93.3 KB Created: 2021-08-04 06:42:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 95f96b26dc4172ce353797e50479dee1 SHA-1: 9304d395f888f47e690781683e556f5500fc843b SHA-256: a8adc8132dd8317ca31a14738f71cbb4db6920d372b7c8ccdeae6f102f339c4c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links, many pointing to compromised WordPress sites and disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. The presence of multiple external URIs and link farms points towards an attempt to lure users to malicious destinations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://pelicanfinancialnetwork.net/ckfinder/userfiles/files/75335297129.pdf In PDF document text
    • https://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608b21775660a---losuluxekulafakilaxazib.pdfIn PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c8e86ed6420---mukedoponekeduvo.pdfIn PDF document text
    • http://domusanna.it/userfiles/files/14887071646.pdfIn PDF document text
    • http://artkulinaria.pl/sites/default/files/file/sofojufim.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be53cc326d7---nojedoguvoju.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/xisojuzerofix.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/879hliglnl4b57cr648k2npgds/gunuwoximowovot.pdfIn PDF document text
    • https://mimpisiluman.com/contents//files/wabax.pdfIn PDF document text
    • https://thehamptonsbloomington.com/wp-content/plugins/formcraft/file-upload/server/content/files/161010bc5bad88---jenebimojirisu.pdfIn PDF document text
    • http://alsumiri.net/wp-content/plugins/super-forms/uploads/php/files/07c0e60bc90a37832597908facbb9572/puzoj.pdfIn PDF document text
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b734c29a185---18249696051.pdfIn PDF document text
    • http://vytvarnyobchod.cz/UserFiles/File/19556478216.pdfIn PDF document text
    • https://dynasty888.com/image/files/20210703_003420.pdfIn PDF document text
    • https://wegofa.com/userfiles/file/54180199730.pdfIn PDF document text
    • http://aldo-ins.com/userfiles/file/82800467064.pdfIn PDF document text
    • http://www.norestim.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16075ceae3dadc---vexijoxerapokage.pdfIn PDF document text
    • http://hasici-pristroje-eshop.cz/files/file/50990089061.pdfIn PDF document text
    • https://hoanghaie.com/Images_upload/files/fakuz.pdfIn PDF document text
    • http://gayaarchi.com/userfiles/file/20210624083723.pdfIn PDF document text
    • http://thebrownbag.vn/upload/files/konorotarotuv.pdfIn PDF document text
    • http://amako-ra.com/wp-content/plugins/super-forms/uploads/php/files/e5e8c3333bbe5e17424c0c11cac433b7/setaxusulivevisoled.pdfIn PDF document text
    • http://7166867.ru/ckfinder/userfiles/files/jejinesa.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bb8c41a1da---97783894729.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=disney+emoji+blitz+calendar+april+2021PDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ec9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC9A 18444 bytes
SHA-256: 3a982a681d108c2b7a97d2c9028f341e4e5ef1da10f48576532438553366d6fa
font_01_sfnt_off00011cf7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CF7 11412 bytes
SHA-256: 9460e2f503eaf95ef3db7ed24ae18aecb4ce50500c6001fa8b63b7e8a7c874b1
font_02_sfnt_off000137b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137B9 16452 bytes
SHA-256: 781f3d159604e2548de361f9eea6c8645554f24ce9d1d848b8bf9b8071002aa8
font_03_sfnt_off00014e50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14E50 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1