Malicious PDF — malware analysis report

Static analysis result for SHA-256 c577fea9f117abe4…

MALICIOUS

PDF

81.6 KB Created: 2021-07-05 22:05:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9a9e0061724778128968fdb091808618 SHA-1: 6d1d21001ad0fd210961837ee651428bc23a3bb1 SHA-256: c577fea9f117abe4657f26d28c341b8af684ae5f79f095929586b8dd3b9f29b6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a link farm with numerous URLs pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to redirect users to malicious content. The document body is heavily obfuscated and unreadable, providing no direct user-facing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://aawyx.com/sites/default/imageuser/file/fofuxaxitibinozet.pdf
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c40e037afae---73747427589.pdf
    • http://www.allatpatikapecs.hu/images/file/54887049373.pdf
    • http://svenstavik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ff1405b4c3---78164728555.pdf
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160916fb3e205b---8806590904.pdf
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4ed4be342c---wukepedotuwiliwopi.pdf
    • http://musicupclose.com/clients/f/f7/f7c291dfb329fbc33054893077acf627/File/dupevozujujexiwenajomema.pdf
    • https://ta-taiwan.com/app/webroot/userfiles/files/libesazitekexedanoror.pdf
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/16090d7f98fa7c---gowonolexitiwetotodi.pdf
    • https://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/16082e9ac53bce---keviwurutekupedaximat.pdf
    • https://luxurytravel-show.com/wp-content/plugins/super-forms/uploads/php/files/25c5c8dfec2859878619c5c475c17dae/86606760689.pdf
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/160ba77ca63aa2---85792106118.pdf
    • http://kingalbertltd.com/uploadedfiles/file/81617920648.pdf
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a54e39c0bf---10692478521.pdf
    • http://bamila.vn/luutru/files/wigisowajejubuzonemixoj.pdf
    • http://www.europesolidaire.eu/userfiles/files/tosegeditajena.pdf
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1608a8cb2b923d---kozasaboxa.pdf
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084ebe2ce609---rezegaboweti.pdf
    • http://cathugo.de/res/wysiwyg/file/70682791469.pdf
    • https://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/839a33fb383205329d27acfda0cacce6/fenubixipoluziruzazuzo.pdf
    • https://getlovebooks.com/wp-content/plugins/super-forms/uploads/php/files/7d2a74fd9030fe61f1ea164be73aa1c2/puxesub.pdf
    • https://www.beewellrx.com/wp-content/plugins/super-forms/uploads/php/files/tmp/pinesobetubetenapodoj.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=types+of+speech+style+quiz+with+answers
    • 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_off0000da4d.bin
ff95f60b9b1277a20d6e90592ebf6a84c3d893a15e84f41f1eab36e6c8cd5844
pdf-font-stream PDF embedded font (sfnt) at offset 0xDA4D 17128 bytes
font_01_sfnt_off00010713.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10713 16792 bytes
font_02_sfnt_off00011f2a.bin
e497c576f8d2b9dadae8e8fd34df2c9764d3a578ec954b7f39b4106ea12ab930
pdf-font-stream PDF embedded font (sfnt) at offset 0x11F2A 11044 bytes