Malicious PDF — malware analysis report

Static analysis result for SHA-256 951804a788ad99aa…

MALICIOUS

PDF

85.7 KB Created: 2021-06-27 00:10:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f9dd98dd100649f1e0551259e4b9f815 SHA-1: 5ecc5ad22722d8d4d9d3837b89a2e25e47669e69 SHA-256: 951804a788ad99aab2b15c242b41d1ed5d216eae32c90b7c420befd3047f6c30
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous URLs pointing to websites, several of which are hosted on compromised CMS platforms. The presence of these links suggests an attempt to lure users to potentially malicious sites for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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://samiznojmo.cz/wp-content/plugins/super-forms/uploads/php/files/947772c45cef81e487d3f28fb579418e/boxamedagimamejin.pdf
    • https://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/9b74e552910ced25f2ab52d001cd50c7/jijivemabagaxowelenutak.pdf
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080ca515b36c---65074875161.pdf
    • http://surtek.biz/image/files/20150118_203528.pdf
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/75d5b4dea3845c6f304ba6cdb5e29ff9/2835211288.pdf
    • http://jevades.com/aircraft/fckimages/file/givigenet.pdf
    • http://astro2sphere.com/admin/images/file/44011559294.pdf
    • http://lifemartrealestateconnect.com/wp-content/plugins/super-forms/uploads/php/files/vd366hsj4opf6onp9nr2u63ar2/xazodezak.pdf
    • http://kondicionery-dolgoprudny.ru/upload_picture/file/kinozagojidunubinere.pdf
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/f386dcb8fd6d28ff23a7edce98be3d21/33403327853.pdf
    • https://cesiedizioni.com/userfiles/file/78267850692.pdf
    • http://billsky.ee/files/file/66675188540.pdf
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/41b39af0d9080f38afc0c2b3f8f98320/53028599486.pdf
    • http://wksystems.net/HotelEstimator/userfiles/file/suduwexumodevij.pdf
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1608af4709ce9b---23022897523.pdf
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/e53a34f533e947d68618c8d5da01eff6/gavetojebemogedosewopa.pdf
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16083da1e6c799---petunaw.pdf
    • http://ohsclassof73.com/clients/9/9a/9a21b0b253f7c4eafe662346d237c286/File/93639523910.pdf
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/37ed0b83b5c96880bd49707918295d1b/71371594712.pdf
    • http://www.abcklima.hu//data/editorfile/wasewanuwudofigu.pdf
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607982eecd39a---93839847200.pdf
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16073f451e699c---gadabowaguwifuj.pdf
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/4f298572a02b41470f94a74a966c942f/tusonebox.pdf
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d52bd2f25da---xegipediwagetoveferi.pdf
    • https://thejinglelab.com/wp-content/plugins/super-forms/uploads/php/files/jp6lcobk3r65tg3arekr6cig5h/zajaraxigaze.pdf
    • https://csom.cz/wp-content/plugins/super-forms/uploads/php/files/5919e076de7eab8b71505e7ef11f0f75/zusafawi.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=do+you+win+real+money+on+blackout+bingo
    • 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_off0000eab6.bin
fc75d6fb14694b14e5d489e7ff39d5668cbc968935ce759d69cd35f621279950
pdf-font-stream PDF embedded font (sfnt) at offset 0xEAB6 17148 bytes
font_01_sfnt_off000117c2.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x117C2 16792 bytes
font_02_sfnt_off00012fd9.bin
e0e684adc9797c07bb07257d9db4ea32da0c1c8aa6339215da80949fb66b72ef
pdf-font-stream PDF embedded font (sfnt) at offset 0x12FD9 10936 bytes