Malicious PDF — malware analysis report

Static analysis result for SHA-256 3306fc08fb938ab8…

MALICIOUS

PDF

91.1 KB Created: 2021-07-25 16:17:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0082a93c434a2cd35d4cfaa56af49193 SHA-1: ac0c4d7737f19b6fdb8359dd1bf73b39baabad65 SHA-256: 3306fc08fb938ab8ce2124459149c8a8f9463be2ec557ef8ec24a89124a6ea4a
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress upload directories, suggesting it's designed to lure users to malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of a link farm on disposable hosting further supports this, with the primary goal appearing to be directing users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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 https://teenvolunteer.org/wp-content/plugins/super-forms/uploads/php/files/5862620f659bcee178beda9326d005f1/vuzulodebexufuga.pdf
    • https://jbdclothiers.net/emailer/userfiles/file/24803625561.pdf
    • https://bisnismedsos.com/userfiles/file/72540619542.pdf
    • https://www.basur-tedavisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b84c9bbf25---zajuso.pdf
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089287781891---20801548269.pdf
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098599faeaf2---wepogiluma.pdf
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/6adb9ef3eed4a02c6c77c315f13f6191/65049163437.pdf
    • https://lepjunk12.hu/uploads/files/vikuwojezexubij.pdf
    • https://homini.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16070e7e9d9d9d---54593485563.pdf
    • http://hodinovysoused.cz/upload/file/burarafozupar.pdf
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/16081c0a0a0594---62673801779.pdf
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9909b89242---882330003.pdf
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be4c6b4c3e8.pdf
    • http://animationcoach.com/userfiles/file/49581738319.pdf
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/1607e0f6777567---zumupololotoleluviwedizev.pdf
    • http://fdscience.com/UPFILE/userfiles/files/geponilafajibimafog.pdf
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16097c3b45488b---pawiv.pdf
    • http://richardsonfamilyreunion.net/clients/7/79/79e100fddb184f5a3447a495e7c481fb/File/9672985345.pdf
    • http://pgnsualumni.com/clients/872691/File/pikifuzaguzesezoxit.pdf
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607c672137f91---dosoxegunezigewi.pdf
    • http://ithaca1962.com/clients/41687/File/vedifirenizebopurawaxu.pdf
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/jt180nnl03a5fna1tsgfhagkd3/50344372639.pdf
    • http://mognational.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082dd965116b---fuwawifilamejazixu.pdf
    • http://arenda-v-novosibirske.ru/ckfinder/userfiles/files/jesenutulodotar.pdf
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b745ed03578---97333351123.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=gta+sa+para+hilesi
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fcff.bin
53a7877f12c7a5c4e367bf6bd312f6a7630c4f6b954663f169e9a92a3c0f8b92		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFCFF 10164 bytes
font_01_sfnt_off000113e3.bin
b33813a89b561bfcc45b548635b894668b597fa011891670092f37c468d62f78		 pdf-font-stream PDF embedded font (sfnt) at offset 0x113E3 19668 bytes
font_02_sfnt_off00014448.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14448 16792 bytes

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