Malicious PDF — malware analysis report

Static analysis result for SHA-256 f12c30b86b4e0d77…

MALICIOUS

PDF

83.8 KB Created: 2021-09-08 20:03:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: a708288a52fa1272036288b1363baca4 SHA-1: 6af576db7b538349420990bd41446141b8e1bd52 SHA-256: f12c30b86b4e0d7731fc24dda962fb9a35164b496502722b56f26de211fcfc2c
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 CMS upload directories, indicating a link farm designed to redirect users to potentially malicious content. ClamAV and ML classifiers strongly indicate malicious intent, specifically phishing or trojan activity. The presence of multiple unknown URLs suggests a broad phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/16133d6e025cd1---99546232366.pdf In PDF document text
    • http://ansing.nl/userfiles/file/74737416779.pdfIn PDF document text
    • http://thevisionkharj.com/userfiles/files/34663455680.pdfIn PDF document text
    • https://arte-salon.ru/upload_picture/buwirerirapoz.pdfIn PDF document text
    • http://jshtextile.com/UserFiles/file///60032543360.pdfIn PDF document text
    • https://www.bmo-agencement.fr/ckfinder/userfiles/files/fojitiziwalojuvapemi.pdfIn PDF document text
    • http://reliancefla.com/admin/images/file/93245874112.pdfIn PDF document text
    • https://maisonforville.be/documents/file/34814152941.pdfIn PDF document text
    • http://yongchengtech.com/uploads/files/202109030736033899.pdfIn PDF document text
    • https://gianlucabruno.it/dati/upload/file/6198169168.pdfIn PDF document text
    • http://mn-print.ru/ckfinder/userfiles/files/84275957724.pdfIn PDF document text
    • https://wisserarm.nl/app/webroot/files/userfiles/files/fumesitozoxulirido.pdfIn PDF document text
    • https://mimpishio1.com/contents/files/8576889764.pdfIn PDF document text
    • https://infoenergie-loire.org/userfiles/file/fokanijarajarinesok.pdfIn PDF document text
    • https://jagamimpi.org/contents/files/meboluxala.pdfIn PDF document text
    • https://pagodatalk.com/_UploadFile/Images/file/33956824727.pdfIn PDF document text
    • http://kondicionery-fryazino.ru/upload_picture/file/44770542225.pdfIn PDF document text
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/161328aa89abce---86680331615.pdfIn PDF document text
    • https://gsm.company/ckfinder/userfiles/files/kinikilajubi.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/161350c3023560.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136b48711940---43931060630.pdfIn PDF document text
    • http://www.norestim.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613290f29f21d---ririkabibolenobe.pdfIn PDF document text
    • http://dangkydoanhnghiep.org/hinhanh_fckeditor/file/37450309600.pdfIn PDF document text
    • https://pnp-studio.com/fckeditorfiles/file/8051580140.pdfIn PDF document text
    • https://sf-tfi-pgu.uz/wp-content/plugins/super-forms/uploads/php/files/631333e46434848b091adb795b14c91c/25907698184.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=full+blood+count+interpretation+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_off0000e42e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE42E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fc40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC40 17380 bytes
SHA-256: 54341cd87a357ccf40d34eb35033e4b01da660e5e335e73115d05fe25aed5123
font_02_sfnt_off00012926.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12926 10660 bytes
SHA-256: c2718ff0a4cd926e1811d891a4852352728ad406ec1c4ae64e16548cd26ca2f3