Malicious PDF — malware analysis report

Static analysis result for SHA-256 9fcc73861895765d…

MALICIOUS

PDF

83.2 KB Created: 2021-09-15 19:34:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: d3ac57d2cb3ee44e7bd5464ffbf10f47 SHA-1: 7d3be55ed011d6210c3eae5b6ad6417dc3477ec8 SHA-256: 9fcc73861895765decadd2534e7151597ffa7d44de241540cc664ff55b316b9a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of multiple URLs pointing to compromised CMS uploads and disposable hosting, combined with a 'download button' lure, suggests a phishing or malware distribution scheme. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of an attempt to trick the user into downloading a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9944

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://kammatrans.com/userfiles/files/53531242724.pdf In PDF document text
    • https://balbok.net/admin/ckfinder/userfiles/files/37704565776.pdfIn PDF document text
    • http://sgyscom.com/upload_fck/file/2021-9-10/20210910210506250508.pdfIn PDF document text
    • https://praktijkbinnenstad.nl/file/mizudijetojubuwivi.pdfIn PDF document text
    • https://benmoonpharma.com/userfiles/file/tagudibozedubasilanatuxup.pdfIn PDF document text
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/16141ec35da4b7---63908527916.pdfIn PDF document text
    • http://wideanglepackaging.com/ckfinder/userfiles/files/11358783664.pdfIn PDF document text
    • https://stayinbranson.com/ckfinder/triplebuserfiles/file/55700308308.pdfIn PDF document text
    • http://desushibar.com/userfiles/file/kojozedeninawexoranetebub.pdfIn PDF document text
    • http://suamayin.biz/userfiles/file/gexasorat.pdfIn PDF document text
    • https://dehaventransportation.com/home/de/public_html/ckfinder/userfiles/files/30998655743.pdfIn PDF document text
    • http://kystop.com/wp-content/plugins/super-forms/uploads/php/files/9d50f9c4f0365b84a6085644811b8851/89345617269.pdfIn PDF document text
    • http://canadianartistic.com/userfiles/file/sedozidekujadi.pdfIn PDF document text
    • http://rockycheng.com/ckfinder/userfiles/files/26677758559.pdfIn PDF document text
    • http://stroyvodservice.ru/upload/File/vitajukaja.pdfIn PDF document text
    • http://xprchemical.com/upload/files/zuvawebutevipomago.pdfIn PDF document text
    • http://geofer.eu/userfiles/files/80144937537.pdfIn PDF document text
    • http://handbook.hu/upload/page/file/zamifu.pdfIn PDF document text
    • http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/nf6s3g7rf3shmvbou147ipgss5/sanazinezona.pdfIn PDF document text
    • http://torgoborud.org/images/file/daxokofof.pdfIn PDF document text
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613ca27eb0444---55987847235.pdfIn PDF document text
    • https://lidiyageorgieva.com/ckfinder/userfiles/files/nijuwuxexirukosur.pdfIn PDF document text
    • https://inprovitcaribe.com/ckfinder/userfiles/files/busiveweravivejazo.pdfIn PDF document text
    • https://danielstrehlau.com/userfiles/file/44970680113.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=tightvnc+viewer+for+androidPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ce23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE23 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e63a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE63A 10656 bytes
SHA-256: 359615a9bb44a90ca1461f83ff7a6bad2fd6192e7e1fc75ca9b3655d800b9a2f
font_02_sfnt_off0000fe78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE78 1680 bytes
SHA-256: 6c08887b596ecb472c5a0482df8c2f828d83fc5b5d16111ed0caa1fced1b35dc
font_03_sfnt_off00010670.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10670 21728 bytes
SHA-256: 5dac634e0bdc662fe9c31c9b327bdb6f3d1a06c4e692c84c8ecb358884ee83f7

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