Malicious PDF — malware analysis report

Static analysis result for SHA-256 d434737471b4e240…

MALICIOUS

PDF

81.0 KB Created: 2021-09-08 01:20:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 10fa70238dda5245065e7623026fd6c9 SHA-1: 9b4045c0be57798a64e042f6802e31b0ad7ff4b3 SHA-256: d434737471b4e24028f3cba0fbf1f7e6a3d84b782731f5a6d7a09ff1ad60f8b0
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised or disposable domains, indicating a link farm designed to redirect users. Heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' strongly suggest this is a phishing or malware distribution lure. The ML classifier and ClamAV detection further confirm its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://bielwod.com/userfiles/file/ruzilikirugaripurogig.pdf In PDF document text
    • http://xlsferrosilicon.com/d/files/dodos.pdfIn PDF document text
    • https://globalazeri.az/wp-content/plugins/super-forms/uploads/php/files/4rsebenii90okauguv301m3uq6/tolegenozor.pdfIn PDF document text
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/26u51l0fu10anoq2dgj5ojrimp/tenixitunefamisojofadom.pdfIn PDF document text
    • https://dailyiat.com/html_upload/file/jinejolo.pdfIn PDF document text
    • https://betenrealestate.com/sites/default/files/file/wedaxokonifa.pdfIn PDF document text
    • http://manhchenang.vn/webroot/img/files/pazika.pdfIn PDF document text
    • http://anhuifan.com/upload_fck/file/2021-7-20/20210720065014213608.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e41ca21f0e---45855036428.pdfIn PDF document text
    • http://minhledtran.com/luutru/files/93692826939.pdfIn PDF document text
    • http://galeriejacqueselbaz.com/userfiles/file/bigidunopozi.pdfIn PDF document text
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077f3ca30d5b---33443644258.pdfIn PDF document text
    • http://amphorabeautyclub.com/campannas/file/tisasedor.pdfIn PDF document text
    • https://jagamimpi.net/contents//files/latonugivekunojapudivava.pdfIn PDF document text
    • http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/160bc015ab8702---kunajamixoside.pdfIn PDF document text
    • https://canvasations.com/wp-content/plugins/super-forms/uploads/php/files/stmt6tip5rkt7aom8vhkcp0n65/xitever.pdfIn PDF document text
    • https://cardion.dk/gfx/fckimages/file/lumufelerewosusefi.pdfIn PDF document text
    • https://sharidendesignasphalt.com/wp-content/plugins/super-forms/uploads/php/files/bb5c339740708ae37d20bf050fc2305d/70570009993.pdfIn PDF document text
    • http://thomas-zigon.de/images/file/72370720555.pdfIn PDF document text
    • https://jamurgoreng.net/contents/files/fewudesujasemuvizemoro.pdfIn PDF document text
    • http://etcad.net/np/upfile/file/32277117764.pdfIn PDF document text
    • http://rorolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/jigifukonumekipoge.pdfIn PDF document text
    • https://bachson.net/upload/file/piwow.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091f5052cd57---vulosarirewalivedonapepa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=whs+act+2011+qld+pdfPDF 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_off0000d56c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD56C 10604 bytes
SHA-256: 109e42e0429fa3ea4e0a21584fe3c80104b4cb2ca523614e939d4835c60d7954
font_01_sfnt_off0000edb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDB7 19396 bytes
SHA-256: 8b3ea91670e572c7173fd59a49e474aea780cfc37abbc4386aa2aec943afffb2
font_02_sfnt_off00011ef5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EF5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1