Malicious PDF — malware analysis report

Static analysis result for SHA-256 b33dba9553c87db3…

MALICIOUS

PDF

71.2 KB Created: 2021-09-01 13:37:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 691e717739cdc4ca96e4feef8d43afa0 SHA-1: f615b627629e40888566dca3f07240f71eb4a294 SHA-256: b33dba9553c87db36650c74eb6e662475e73fa6ebe48feada67d2f9171410c4f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF that contains numerous links to potentially compromised websites, identified by heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM'. The ML classifier and ClamAV also flagged this PDF as malicious, specifically as a phishing trojan. While no scripts were directly extracted, the structure and embedded URLs suggest an attempt to redirect users to malicious content, likely as part of a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://www.misshandicap.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1607426e0ef4b0---tudumifidegefod.pdf In PDF document text
    • http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160810b0897175---savada.pdfIn PDF document text
    • http://alpha-cp.com/userfiles/file/fudagatobimanazevezimeli.pdfIn PDF document text
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160b062bf6a0f8---linaxebugetuwagenuzi.pdfIn PDF document text
    • http://thebaileyfamilyreunion.com/clients/6/6f/6f45d7e5c9279c15d0bd3a3fa6949618/File/99156248672.pdfIn PDF document text
    • https://kfz-gutachter-oliver-schiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607edd9acacc1---lumitoduluzamiloga.pdfIn PDF document text
    • https://edu-mate.kr/_UploadFile/Images/file/wekitulezudi.pdfIn PDF document text
    • http://falerisztika.hu/tmp/wexumizadi.pdfIn PDF document text
    • https://textmakareknutsson.se/upload/image/59726056859.pdfIn PDF document text
    • http://naitikfashions.com/ckfinder/userfiles/files/9998011256.pdfIn PDF document text
    • http://www.gabrielamaciel.net/images/content/file/kodosema.pdfIn PDF document text
    • https://semangkabiji.com/contents//files/66034500547.pdfIn PDF document text
    • http://dioceseofniranam.org/userfiles/file/xudutufi.pdfIn PDF document text
    • http://www.telsercom.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073869306d74---65633067951.pdfIn PDF document text
    • http://provia-events.de/pics/fotos/1/file/83020153701.pdfIn PDF document text
    • https://hylyt.co/wp-content/plugins/super-forms/uploads/php/files/0fd5a7cba50c7b10ddea2c074a379873/66066363264.pdfIn PDF document text
    • https://hefcom-hydraulics.com/ckfinder/userfiles/files/waleke.pdfIn PDF document text
    • https://www.anandtirth.com/wp-content/plugins/super-forms/uploads/php/files/o2vnpqcs878kl1h8t2m4edfhm4/bapefu.pdfIn PDF document text
    • https://digireg.at/upload/32486269110.pdfIn PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084f3b88b987---musol.pdfIn PDF document text
    • http://anhuizhkj.com/upload_fck/file/2021-4-29/20210429104224256108.pdfIn PDF document text
    • https://robotics-institute.com/wp-content/plugins/super-forms/uploads/php/files/fapasai6hskhesnprbfc4g878p/86714953441.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=what+is+a+group+of+sheeps+calledPDF 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_off0000b967.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB967 14460 bytes
SHA-256: fe1e8da7c9f3fff9b4866bbc3ede8096e0d79fa87db8d6c78f8802e3d12e13b8
font_01_sfnt_off0000dd22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD22 10888 bytes
SHA-256: 346c40ea4d34cfd873bf1b83db65b4d1e1df0dd4d82a3147979090c2346e4e54
font_02_sfnt_off0000f647.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF647 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.