Malicious PDF — malware analysis report

Static analysis result for SHA-256 74ec2c2fc54d9afc…

MALICIOUS

PDF

71.6 KB Created: 2021-09-13 04:46:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: a9a4381c82cdce62dca40a01b3cfed6f SHA-1: 06a11f9a0aa6293a85d9409a7493fb9aaa900e00 SHA-256: 74ec2c2fc54d9afc3ff818b33d74ff9bfc0449d0c29c63bfce53fbf27757b13f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links pointing to compromised WordPress upload storage and other disposable hosting sites, indicating a link farm or phishing lure. The ClamAV detection as 'Pdf.Phishing.Trojan' and the ML classifier's high confidence score further support its malicious nature. Although no scripts were directly extracted, the structure and URL patterns are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

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://www.clubmanizales.com.co/wp-content/plugins/formcraft/file-upload/server/content/files/16134fc9724718---munovuro.pdf In PDF document text
    • http://drukarnia-skawina.pl/app/webroot/media/files/nafelatapu.pdfIn PDF document text
    • http://rdmsrl.it/userfiles/files/regavofagubovatusisowaf.pdfIn PDF document text
    • http://deauville.ru/files/file/wibizaligodotud.pdfIn PDF document text
    • http://am-assets.com/aom/magnolia/userfiles/file/31901612312.pdfIn PDF document text
    • http://permanentnimakeup-brno.cz/userfiles/files/86402953037.pdfIn PDF document text
    • https://volpatoebrum.com.br/_common/admin/scripts/ckfinder/userfiles/files/waruzododup.pdfIn PDF document text
    • https://x-software.cz/data/file/gofawadu.pdfIn PDF document text
    • http://gdfsztal.com/uploadfile/files/55065738967.pdfIn PDF document text
    • http://khyljg.com/uploadfiles/files/33551243038.pdfIn PDF document text
    • http://www.highlandmetals.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16130b1287f7d7---lonuzuji.pdfIn PDF document text
    • http://gusanhightec.com/userData/board/file/53728194776.pdfIn PDF document text
    • http://studioghittigargnano.com/userfiles/files/pazujafetewutaw.pdfIn PDF document text
    • https://texigo.tw/upfile/files/2021/09/10/vadux.pdfIn PDF document text
    • http://tnslib.net/userfiles/files/37927957757.pdfIn PDF document text
    • https://tl-systems.hu/files/files/xepur.pdfIn PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/161394363b64c8---43271542115.pdfIn PDF document text
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b39ea46a20---50373374754.pdfIn PDF document text
    • http://thuexe7cho.vn/upload/files/xexix.pdfIn PDF document text
    • http://streathamtaxi.com/survey/userfiles/files/wazelopizuvi.pdfIn PDF document text
    • http://bidadapatidar.com/userfiles/file/rumomifofamemitadefuzi.pdfIn PDF document text
    • http://lltsg.com/uploadfile/file///2021090204110555.pdfIn PDF document text
    • http://contua.org/userfiles/file/kisewivijopevelagedaxa.pdfIn PDF document text
    • https://istanajp2.com/contents/files/87095116971.pdfIn PDF document text
    • http://montpellier-businessplan.eu/mbp/upload/images/images/upload/ckfinder/sabinikixidopubew.pdfIn PDF document text
    • https://clinicaabrahaoosta.com.br/ckfinder/userfiles/files/vodenevejeporabiladen.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=my+sweet+roomies+mod+apkPDF 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_off0000b7f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB7F5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d00c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD00C 10688 bytes
SHA-256: 55d64ac5a59e3864c6b421f5303e8bc853794030f2d9d7aa65a60a290d006a06
font_02_sfnt_off0000e8b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8B0 15752 bytes
SHA-256: 215cd5b1dfea9a1b549835df2cbb2e9ec4a189c7d15d5258f78ffdc333a52d10

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