Malicious PDF — malware analysis report

Static analysis result for SHA-256 d272a29b8ef499d7…

MALICIOUS

PDF

104.7 KB Created: 2021-08-05 00:16:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: abcfd0048cab31800a7ca277ac2b663b SHA-1: 6a7c779d278ad5e4f82431a33169d672493e11b3 SHA-256: d272a29b8ef499d7e63ed495f3fe2396b62b4c5c7b50ed53ebae469f1d34e5d9
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 external websites, including those hosted on compromised CMS platforms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to phishing or malware-hosting sites. The presence of a link farm suggests an attempt to distribute malicious content or redirect users to fraudulent pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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 https://nacionalequipamentos.com/ckeditor/uploads/files/liwizatu.pdf In PDF document text
    • http://albino-pitti.com/pub_img/file/31023273351.pdfIn PDF document text
    • http://littlefreddieking.com/clients/65037/File/1981203001.pdfIn PDF document text
    • http://cci100.com/clients/57496/File/99593360727.pdfIn PDF document text
    • http://daiichilogistics.com/uploads/news_file/xuputirodetuvurakesunazin.pdfIn PDF document text
    • http://jagodkaprzedszkole.pl/userfiles/file/52624917645.pdfIn PDF document text
    • http://vishwkarmaenterprises.com/webroot/img/userfiles/files/juderibogupifupanowu.pdfIn PDF document text
    • https://apoc.com.au/wp-content/plugins/super-forms/uploads/php/files/5afc200b10922e0cfa0cdd53209b1e09/56940879978.pdfIn PDF document text
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c72ffadf556---gisepebofolobetupaponoka.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/kjm62skse579stbvo1oeiqa9f6/bamositofogabimofipup.pdfIn PDF document text
    • http://kanchanaspa.com/ckfinder/userfiles/files/58346359251.pdfIn PDF document text
    • https://www.qbuildsoftware.com/wp-content/plugins/super-forms/uploads/php/files/d72f5feba5295415ba41150794837eb2/17265418468.pdfIn PDF document text
    • http://sistersaviopublicschool.com/userfiles/file/gobiniweg.pdfIn PDF document text
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e4b49da94c---nokesurokezepun.pdfIn PDF document text
    • https://cashmeredreams.com/wp-content/plugins/super-forms/uploads/php/files/2a470faf73b123f9eb07572526bed4da/diboxoxituwux.pdfIn PDF document text
    • https://saleskerala.com/ckfinder/userfiles/files/mazar.pdfIn PDF document text
    • http://pensacolahigh1964.com/clients/1/1d/1d652d7f5bd5fd2f3712913460b20393/File/gumomezup.pdfIn PDF document text
    • https://syntellect.ru/Repository/file/ponukonopobixunejodifova.pdfIn PDF document text
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/tshipfc2kn351auglcbo7pl0t3/64172053855.pdfIn PDF document text
    • http://alituncer.com/userfiles/file/dumawu.pdfIn PDF document text
    • https://djhelaly.com/wp-content/plugins/super-forms/uploads/php/files/4c3ad44864b51f2f5d999a7c261d006e/xuxemurumiguwozeza.pdfIn PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b95ecfc0d98---putozositovifad.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=informative+report+of+demat+account+conclusionPDF link annotation
    • https://www.posluh.hr/ckfinder/userfiles/files/51535211050.pdfIn PDF document text
    • 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_off0001372b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1372B 17016 bytes
SHA-256: 87efdbea736ff6e8e1d242c2452c0b661fb05815bc10e99490df5764878678ff
font_01_sfnt_off00016396.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16396 10896 bytes
SHA-256: c8a9c581ca80cfc0782d7fd29d0b819379d55d83d6e2348893c3664fb0b6ae0d
font_02_sfnt_off00017cd0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17CD0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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