Malicious PDF — malware analysis report

Static analysis result for SHA-256 cdb6269ff30a55ba…

MALICIOUS

PDF

80.9 KB Created: 2021-09-23 13:46:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 86eaf341c3ee9a439951df60a8070685 SHA-1: 41baf6677c1ec432887179fb861423f72eb10c1f SHA-256: cdb6269ff30a55baad9538bda524faab9a881b7f5a922daea761725f17c9ca0e
156 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as a phishing trojan and by an ML classifier, indicating malicious intent. Heuristics identified it as a link farm pointing to numerous domains, several of which are associated with compromised CMS uploads or disposable hosting. The embedded URLs suggest an attempt to lure users to external sites, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://maybomnuocdanang.com/uploads/image/files/gidijanajob.pdf In PDF document text
    • http://adamlegal.com/userfiles/file/91011832532.pdfIn PDF document text
    • http://otworz-biuro-podrozy.pl/userfiles/file/belebunozefunubitagi.pdfIn PDF document text
    • http://tianlanip.com/filespath/files/20210917080050.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/161350f89f318e---pewegutipanotikepewudawe.pdfIn PDF document text
    • https://polenhosting.com/calisma2/files/uploads/xazowibazetadeganup.pdfIn PDF document text
    • http://metabolitplus.ru/files/file/kuvifapidalagisuxiwus.pdfIn PDF document text
    • http://hoangle.vn/uploads/userfiles/file/sowigexuweluzawilezap.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/16136f2ce45ded---nawelapopadejowofazos.pdfIn PDF document text
    • https://mehregancenter.ir/images/upload/files/13627875347.pdfIn PDF document text
    • http://savitapiti.org/ckfinder/userfiles/files/patoverif.pdfIn PDF document text
    • https://e-motorcycle.tw/upload/emotorcycle/files/wegutirakuxemadipiline.pdfIn PDF document text
    • https://ipic.vn/userfiles/file/10654383639.pdfIn PDF document text
    • http://valentine.tutaylamhet.com/storage/ckfinder/files/dirivoz.pdfIn PDF document text
    • http://lafenicealcamo.it/userfiles/files/44902996937.pdfIn PDF document text
    • https://maturana.cl/upload/file/dapolel.pdfIn PDF document text
    • https://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/03aec55d88d77db18c18651dadda2e01/70942081570.pdfIn PDF document text
    • https://dauglita.lt/components/com_mijoshop/opencart/image/data/files/nazitazasi.pdfIn PDF document text
    • http://shuimotongyuan.com/userfiles/file/taxagupajibadim.pdfIn PDF document text
    • https://ags-car.60km.com/upload/files/sozomarax.pdfIn PDF document text
    • http://cycling-software.com/files/file/79913945326.pdfIn PDF document text
    • https://www.ideaklinikkadikoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614666a3c2fcf---92360026352.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=touch+crosshair+to+calibrate+android+tabletPDF 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_off0000d975.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD975 10668 bytes
SHA-256: 8b21ee36c6f8dd7655897d790b9b2cf1f89e07bc35da74ab542994434802284e
font_01_sfnt_off0000f1d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1D8 17172 bytes
SHA-256: f62e78bbc64430a983d53e5dec625a8799c00ce00a20e495d49cee807fd6dc19
font_02_sfnt_off00011e37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E37 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1