Malicious PDF — malware analysis report

Static analysis result for SHA-256 753ba4806769efdd…

MALICIOUS

PDF

84.4 KB Created: 2021-09-05 08:19:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: d2290edd8bc15253ed7ca7553aa73964 SHA-1: 05ce4350cf2947e7d428e13c689fc25cd3484a0d SHA-256: 753ba4806769efdd2dfe61b4960bb15e37596521795cc7eb3e33e836e8621202
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077db8d4741f---5445983114.pdf In PDF document text
    • http://josephlillianmorrisfamily.com/clients/59960/File/65027396951.pdfIn PDF document text
    • http://ypdtools.com/ckfinder/images_store/files/xumowigumubos.pdfIn PDF document text
    • http://spzpoz-zdunskawola.pl/upload/file/ketivexaxosede.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c780433617.pdfIn PDF document text
    • https://www.straightmyteeth.eu/wp-content/plugins/super-forms/uploads/php/files/af7800a3084a2516e6e0c12722d796a5/99156029017.pdfIn PDF document text
    • http://newcityhk.com/userfiles/50390420787.pdfIn PDF document text
    • http://xn--c1aejbdnke.xn--p1ai/admin/ckfinder/userfiles/files/simez.pdfIn PDF document text
    • http://fipjp.com/userfiles/file/77079697706.pdfIn PDF document text
    • http://riskhedgetech.com/uploaded/file/5401983516100b772a3d62.pdfIn PDF document text
    • http://hungthanhauto.com/luutru/files/9369187109.pdfIn PDF document text
    • https://terravistahometeam.com/wp-content/plugins/super-forms/uploads/php/files/5bbc15377c07b1f17d9ab9a67103205a/24221903713.pdfIn PDF document text
    • https://liniagdanskzydowo.pl/files/11763415937.pdfIn PDF document text
    • http://schodylux.pl/userfiles/file/walarebemosedixobuzuz.pdfIn PDF document text
    • http://www.anclupnapoli.it/userfiles/file/degagafagerutamufugidap.pdfIn PDF document text
    • http://stonepigments.com/userfiles/file/sipujabubasebala.pdfIn PDF document text
    • http://shangrilatheshow.com/ckfinder/userfiles/files/54099632994.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a20102a7409---lesadaruwoxo.pdfIn PDF document text
    • http://muszempilla.com/files/file/61375061549.pdfIn PDF document text
    • http://kovacsoltvaskerites.hu/images/file/66954033192.pdfIn PDF document text
    • https://derfo.info/resimler/files/95361466718.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a143128ec7---vosuw.pdfIn PDF document text
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/css7518bcm9qq7l316p9c85a25/pufogilexuminavam.pdfIn PDF document text
    • https://aquamedicasatumare.ro/ckfinder/userfiles/files/bizumetuxadijiditiki.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=unir+pdf+foxit+phantomPDF 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_off0000e08d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE08D 19828 bytes
SHA-256: 84bce94e557f6ea1abc355750b5df805cf8d21080e9b263f011050b470879bf4
font_01_sfnt_off0001147a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1147A 10524 bytes
SHA-256: 1aa34be524169c2db67e386de51345716b43e9214c6989e70389b7bca1aad1a4
font_02_sfnt_off00012c30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C30 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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