Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b9b1e99d467e68b…

MALICIOUS

PDF

80.5 KB Created: 2021-09-05 10:36:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 584fcb3d603634490ab368ca5ea43cc2 SHA-1: 38c9027eecbb223a8156bc3325d1b3e820e2dba9 SHA-256: 6b9b1e99d467e68b7c1519bacfd2e65ca44fc1404495d3e333b967ca78c223db
164 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to compromised CMS uploads and disposable hosting, indicating a link farm designed to lure users to external sites. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware delivery. The presence of a 'download button' heuristic further supports the lure aspect.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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 https://www.expoagrogto.com/wp-content/plugins/super-forms/uploads/php/files/j2c8o1n9hcagi78qt0n3kv84b0/16920379499.pdf In PDF document text
    • https://www.simcoerecovery.net/wp-content/plugins/super-forms/uploads/php/files/d5selfsd9a3rcdi1b98at1rq8n/zawul.pdfIn PDF document text
    • https://yifff.se/userfiles/file/japobaboke.pdfIn PDF document text
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/oecaepinmorv6tv2nignch5eo8/39605518031.pdfIn PDF document text
    • https://kidneystonetreatment.in/userfiles/files/tivejunej.pdfIn PDF document text
    • https://www.emma-solutions.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609eba587789b---wavavuvalonukatikuba.pdfIn PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0734c1a7f5---totowepipukopoxakole.pdfIn PDF document text
    • http://alpha-th.com/userfiles/file/jefuzapuwiwusepokevovovom.pdfIn PDF document text
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/lv6e82glmpaooa8chm4l5rl5r0/91971592020.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087926c7ed84---nepafojurunivufut.pdfIn PDF document text
    • http://efuturesthai.com/uploads/file/99329168400.pdfIn PDF document text
    • http://phuongdonggolf.vn/app/webroot/uploads/files/85554597773.pdfIn PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160996bb6c08c1---tuxipugojexorafafilezojin.pdfIn PDF document text
    • http://monarchiaerembolt.hu/tmp/85003224927.pdfIn PDF document text
    • https://hoovermaids.com/wp-content/plugins/super-forms/uploads/php/files/d56908b1d6fff0ded9fed30f2ae475bf/94368383248.pdfIn PDF document text
    • http://talk200.com/admin/admin/uploadfiles/file/fitutorom.pdfIn PDF document text
    • https://accuratesearch.com/userfiles/file/1360079000.pdfIn PDF document text
    • http://www.northeastmarquees.com/wp-content/plugins/super-forms/uploads/php/files/808bff3d43e4a66fee881e938640eb26/70738279235.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c98f352612e---lasem.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/vomk4qdad30cu0a4kn0b7e05c6/jawagirejivo.pdfIn PDF document text
    • http://safiorida.nl/operatori/userfiles/file/68751862186.pdfIn PDF document text
    • http://sjar-tech.com/uploadfile/file///2021052509001397.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/8vjoqaeprbkbknbacd3vkatdgi/95573673694.pdfIn PDF document text
    • http://china-guolin.com/filespath/files/20210816025622.pdfIn PDF document text
    • http://librojuridico.com/aym_images/files/30467639719.pdfIn PDF document text
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cb9f802fa91---mizetigijudodiruga.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=platinum+wiskunde+graad+6+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_off0000d235.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD235 18280 bytes
SHA-256: 76d5a83157689a6c4dcfdf1d9d8d625c86bf4c127dd3cbf5d89d26b8db7ffa64
font_01_sfnt_off0001024c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1024C 11168 bytes
SHA-256: 7b700a9e47df7cc5756c22e7acf41660d8889a9272074e9b4ee6b84c549f42e1
font_02_sfnt_off00011c3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C3B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1