Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4a75589734ae864…

MALICIOUS

PDF

84.5 KB Created: 2021-09-07 03:11:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 550081e94557b36164db44cba98268da SHA-1: 7698674b1b09f34913ff37b74da348c3425bff17 SHA-256: b4a75589734ae864a444c8dba36b12476dbdd46483f2427f25fea5ac0f162be8
124 Risk Score

Malware Insights

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

The file is identified as a malicious PDF by ClamAV. Static analysis reveals it functions as a link farm, with numerous URLs pointing to compromised CMS upload directories. These links likely serve as lures for phishing or to distribute further malware, as indicated by the PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.3253

Heuristics 5

  • 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
  • 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://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/2rp7vi0klbmi0nta8sq8tgttd1/dujakiluluzonitotas.pdf In PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/160be772d5e063---mejefer.pdfIn PDF document text
    • https://arerp.kr/data/file///gefepenalapusi.pdfIn PDF document text
    • https://lostsoulsmemorialnj.org/wp-content/plugins/super-forms/uploads/php/files/22d41f31fa368f919a7d06839662c73c/86650070575.pdfIn PDF document text
    • https://arab-hams.com/Ups/files/71888113450.pdfIn PDF document text
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/16075a02d0f3c2---guzalezidutuw.pdfIn PDF document text
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160bffb1252bc8---tazokitadet.pdfIn PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160b409446b4d2---filuz.pdfIn PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf98755f8c8---gagosinusax.pdfIn PDF document text
    • http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1611da20c1a25f---43969188496.pdfIn PDF document text
    • http://srividyaastrology.com/userfiles/file/xelazogaxamex.pdfIn PDF document text
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/fc32787544c99a470a54d3d7246d5d1b/gipumipavureziziwuwafiw.pdfIn PDF document text
    • http://foodchemsino.com/d/files/79392014289.pdfIn PDF document text
    • http://www.playerclub.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a106ee5aeee---80740659352.pdfIn PDF document text
    • http://lacasedescaraibes.fr/file/zajas.pdfIn PDF document text
    • http://sazjah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0c1f17cd28---wituxam.pdfIn PDF document text
    • http://drive4smilesontario.com/clients/e/ed/ed023a0734c265ca673a92d1d81de675/File/2296090198.pdfIn PDF document text
    • http://hferrynetworks.com/FileData/ckfinder/files/20210828_CE5EC93EA6237702.pdfIn PDF document text
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a451c5dcfac---94245202976.pdfIn PDF document text
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/rst4708sf8ilt92blv5q3d571r/lubebutarugodozamaku.pdfIn PDF document text
    • http://studiolegaletrotta.eu/userfiles/files/92922022874.pdfIn PDF document text
    • https://biodent.ro/m4fm_files/m4news/ck-uploads-files/wekuzudilo.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/46752633532.pdfIn PDF document text
    • https://fietenhaardenenkachels.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16106b3c67742b---vadofimodaxudopemafowa.pdfIn PDF document text
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5dfe54b930---musujevumoxikiwopazorod.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=cbt+reframing+thoughts+worksheetPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f80e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF80E 18476 bytes
SHA-256: 278697c0f650541c2f49a2954a300552adb15c09f795c4b7262a307d8f32c1df
font_01_sfnt_off000127ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127EF 11064 bytes
SHA-256: 1047971de8b0482eaa8fbb046dc40ba95f863636561d3190fcbc8195841073d0