Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8a45995bff337a9…

MALICIOUS

PDF

85.3 KB Created: 2021-09-19 10:31:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 0da187da99269f065803b7b1ad1241ef SHA-1: 5c1a9069d93616ed04462d0f899c8176310461e6 SHA-256: d8a45995bff337a90e3c5229a570b12cc55e56b940917b312c121e23e185739d
204 Risk Score

Malware Insights

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

The sample was flagged by ML classifiers and ClamAV as malicious, with heuristics indicating a social engineering attack (ClickFix) and a link farm. The document body is heavily obfuscated, but the presence of embedded URLs and the ClickFix heuristic suggest the user is prompted to execute a command or follow a malicious link, likely to download a secondary payload. No scripts were extracted, but the PDF structure and embedded URLs are indicative of a phishing or malware delivery attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • ClickFix social engineering attack high SE_CLICKFIX
    Document instructs the user to press Win+R or paste a command into a terminal — consistent with ClickFix attacks that bypass macro restrictions by tricking users into running malicious commands directly
  • 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 http://greatwalledmond.com/ckfinder/userfiles/files/30584108897.pdf In PDF document text
    • https://khambenhxahoi115.com/images/files/77472765681.pdfIn PDF document text
    • http://kargiskola.ge/myadmin/ckeditor/ckfinder/userfiles/files/linubanowazimo.pdfIn PDF document text
    • http://tpokebar.com/uploads/files/34549414255.pdfIn PDF document text
    • http://forti.in/userfiles/file/zagujujuverawivotutafiz.pdfIn PDF document text
    • http://vizugy.hu/uploads/files/files/34497380705.pdfIn PDF document text
    • http://www.impactit.in/ckfinder/userfiles/files/58368154162.pdfIn PDF document text
    • http://eco-building.cz/UserFiles/File/30815702294.pdfIn PDF document text
    • http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/mcrvkl9re0p6lso9kdset5988g/wabewage.pdfIn PDF document text
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142dad546684---dupigidubokepuna.pdfIn PDF document text
    • http://agriturismolescuderie.eu/userfiles/files/vapufozari.pdfIn PDF document text
    • http://solyaris.pro/admin/ckfinder/userfiles/files/53700564370.pdfIn PDF document text
    • http://kasaitogo.com/uploads/files/xuvotemivurege.pdfIn PDF document text
    • https://wholisticvibrations.com/wp-content/plugins/super-forms/uploads/php/files/3ddf7c59062e55e4416478f2c0532cb3/kobonugojul.pdfIn PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613f2da66f04e---vabajevaruxijetadubib.pdfIn PDF document text
    • http://abwingssuffolk1.com/uploads/files/bizolalifatoziwulun.pdfIn PDF document text
    • http://krukewittfarms.com/userfiles/file/724816927.pdfIn PDF document text
    • http://grapes4u.ca/sites/all/sites/grapes4u.ca/files/37745291071.pdfIn PDF document text
    • http://opusbiz.kr/data/editor/file/626571877612fda9648d4a.pdfIn PDF document text
    • https://lazdynumokykla.lt/userfiles/file/verujasupituruw.pdfIn PDF document text
    • http://khonggianxua.samdigroup.vn/app/webroot/upload/files/fitemoxenu.pdfIn PDF document text
    • https://alteanetworks.fr/img/file/62546703725.pdfIn PDF document text
    • http://goodwill.pl/userfiles/file/99359607325.pdfIn PDF document text
    • http://autoklej.pl/app/webroot/media/files/latetuw.pdfIn PDF document text
    • https://pioneerlift.com/upfiles/editor/files/40351591798.pdfIn PDF document text
    • http://doctour.hu/uploads/ckfinder/userfiles/files/58776070248.pdfIn PDF document text
    • https://serihosting.com/calisma2/files/uploads/dejezigumop.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=powerwash+simulator+download+androidPDF 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_off0000e62f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE62F 18716 bytes
SHA-256: 5fe89e8b353b2c86d2ae0ece972d87051da3df4a26a68a461078ad5e169d5a0f
font_01_sfnt_off000116ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116EE 10700 bytes
SHA-256: 0a285a1108609525777a64597a7bb3cfe7271932d982b240f9411d5ad12b8b35
font_02_sfnt_off00012f5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F5D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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