Malicious PDF — malware analysis report

Static analysis result for SHA-256 697f7c3c5668b061…

MALICIOUS

PDF

99.0 KB Created: 2021-07-22 05:06:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 231b215b475ee13b3c7402eb9b8b7eb9 SHA-1: 77e0083cf3161f8788d4e483dd8e258483373ede SHA-256: 697f7c3c5668b061a20e46f3bc6b364fa18c5af4ac09e312237ebd7607a7bbc7
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised CMS upload storage and disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ce64a1c2fb---73386654491.pdf In PDF document text
    • https://edcasys.com/ci/userfiles/files/wupirofadatilofutijidum.pdfIn PDF document text
    • http://kochamsushi.pl/UserFiles/file/pinomitupanuxewis.pdfIn PDF document text
    • https://telewebmarketing.com/FCKeditor/file/samakeri.pdfIn PDF document text
    • http://neoneophytou.com/ckfinder/userfiles/files/4209500267.pdfIn PDF document text
    • http://ajivikafinance.com/userfiles/file/guzisipufegutamowa.pdfIn PDF document text
    • http://bkbflooringusa.com/userfile/abbey/file/zabaxowefonaperejiziruw.pdfIn PDF document text
    • https://iamtimeshare.com/userfiles/file/59048612988.pdfIn PDF document text
    • http://zzquansu.cn/d/files/88732555073.pdfIn PDF document text
    • http://chobacgiang.net/webroot/img/files/sapusuvenuruve.pdfIn PDF document text
    • http://brookhavenclassof1967.com/clients/0/0c/0ca802fc87877f8c548ddf85495caeb2/File/81100544407.pdfIn PDF document text
    • http://extintoresorigen.com/images/editor/tesaberakonakeneguwajuxuv.pdfIn PDF document text
    • http://rjt1.org/upload/files/mamazapejitofuvojiji.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/16094446d5cae0---13245213448.pdfIn PDF document text
    • https://edoxmarketing.com/wp-content/plugins/super-forms/uploads/php/files/9m6rp2pc9if308u46slqpina59/86510784440.pdfIn PDF document text
    • http://fuga-hotel.com/CKEdit/upload/files/20302221831.pdfIn PDF document text
    • http://kosmonautika.ee/ckfinder/userfiles/files/foturez.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/160790aa4bd00a---71409444967.pdfIn PDF document text
    • https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16098ca2b3a2b6---62613376514.pdfIn PDF document text
    • http://steelbo.com/uploads/admins/u0/files/20210604114358.pdfIn PDF document text
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/160986063dfaba---pupukovugovejadedafo.pdfIn PDF document text
    • https://www.beewellrx.com/wp-content/plugins/super-forms/uploads/php/files/tmp/99083326214.pdfIn PDF document text
    • https://www.crossfitparamaribo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adaebfe67fd---46937952670.pdfIn PDF document text
    • https://big-cash.de/wp-content/plugins/super-forms/uploads/php/files/ocrdemb6brpcftq6ggehhnduar/88667322146.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=marriage+anniversary+quotesPDF 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_off00011dc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DC0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000135d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135D7 10656 bytes
SHA-256: 43db5d2c04871424b57e67492574bb0ed69c77f3a593573f4319367f5bae8890
font_02_sfnt_off00014e25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14E25 18524 bytes
SHA-256: 22078b2e7b45bf5fd9c32e11393ac9ed75d572c369880351920b33ac8d5928c4

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