Malicious PDF — malware analysis report

Static analysis result for SHA-256 fcc7be3bf951256e…

MALICIOUS

PDF

72.1 KB Created: 2021-09-18 20:02:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 1e2f6ed012586a264361133d7e2dea1c SHA-1: b3da93d4061956e9490ffa869c027d3fb2338494 SHA-256: fcc7be3bf951256e0a16b5a63d57534e0bd52ba71c46fa0ea49d9bd4a589a571
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS upload storage, indicative of a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution through these links. No scripts were extracted, but the structure and URL patterns are consistent with a malicious PDF used for initial access.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://mp-journal.com/media/file/46710058188.pdf In PDF document text
    • http://tianfonmm.com/d/files/tijifirerifidijikugowiz.pdfIn PDF document text
    • http://mentor-tutor.com/newGroserLikeProject/uploads/files/81415062092.pdfIn PDF document text
    • https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/cfc0db82f2062862faddea8f31a59e6f/33628451798.pdfIn PDF document text
    • http://airconbank.com/upload/fckeditor/file/48739914821.pdfIn PDF document text
    • http://saatgaamkansarasamaj.com/admin/uploads/files/xegunorekonovumixulonasu.pdfIn PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/161420abb8e520---zugojonipule.pdfIn PDF document text
    • http://qualityspices.in/ckuploads/files/73133127512.pdfIn PDF document text
    • https://ost-fogging.com/upload/files/sevewok.pdfIn PDF document text
    • http://china-baby-clothes.com/d/files/vaxoxub.pdfIn PDF document text
    • http://rsti.biz/files/fck/file/wexuwunuxoxijatelubazimud.pdfIn PDF document text
    • https://fancybox.pamlskovnik.cz/ckfinder/userfiles/files/395033374.pdfIn PDF document text
    • https://fentesmakina.com/paket/upload/files/41298589373.pdfIn PDF document text
    • http://residenzaeden-albisola.com/userfiles/files/masamo.pdfIn PDF document text
    • https://rimsball.com/ckfinder/userfiles/files/petelug.pdfIn PDF document text
    • https://audreyheselmans.com/_files/file/sakozot.pdfIn PDF document text
    • https://astdubai.co/userfiles/files/zelexata.pdfIn PDF document text
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f945f09619---8036341167.pdfIn PDF document text
    • http://opt-russtd.ru/data_center/upload_pictures/file/85249965237.pdfIn PDF document text
    • http://epmresearch.org/userfiles/files/detojavo.pdfIn PDF document text
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b1d3908fcd---20762063148.pdfIn PDF document text
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613a2166b6dc9---98399759645.pdfIn PDF document text
    • https://securitydm.rs/slicice/file/45451360190.pdfIn PDF document text
    • http://jagatjyotischool.org/jagatjyotischool/userfiles/file/53717225739.pdfIn PDF document text
    • http://sicilyontable.it/userfiles/files/87179821754.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=best+radio+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_off0000bb23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB23 15620 bytes
SHA-256: 4548e770f41b0309c37e1162590d184213946bb1a42f3d4d43565997b220542b
font_01_sfnt_off0000e314.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE314 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fb2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB2B 10380 bytes
SHA-256: c05bd2890e4275426fea71fd63bbfa18aa8faf476497476e3ed2dc437d876039

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