Malicious PDF — malware analysis report

Static analysis result for SHA-256 795d43a64bf6bf5a…

MALICIOUS

PDF

86.7 KB Created: 2021-07-15 10:43:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 377928cd921584c91e5d758f2a80f982 SHA-1: bc60998810716c911d2e0260f198e3b2a4a1ccf0 SHA-256: 795d43a64bf6bf5a1e797b3493d5223bf98783d61e6dd9a560fc468d37c1b9cf
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The file contains a link farm pointing to numerous compromised websites, likely intended to redirect users to malicious content. The presence of multiple external URIs and a link farm on disposable hosting strongly suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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 http://timnhanhonline.vn/upload/files/37937876804.pdf In PDF document text
    • https://www.alongsideasia.com/wp-content/plugins/super-forms/uploads/php/files/26ccffbe45572edf663be0a32202416e/64274902104.pdfIn PDF document text
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160a48af5dfebf---36072110240.pdfIn PDF document text
    • https://www.audioclinica.pt/wp-content/plugins/super-forms/uploads/php/files/9j3sikjv5kuqsol5vbd2j2d6o4/94905992912.pdfIn PDF document text
    • https://telenovella-bg.com/files/13622717320.pdfIn PDF document text
    • http://www.majbrno.cz/uploads/files/21740996087.pdfIn PDF document text
    • http://davidhammerstein.org/userfiles/file/48026785887.pdfIn PDF document text
    • https://ceilford.org/wp-content/plugins/super-forms/uploads/php/files/26e5c3492a15b11850ace314e82aee7d/kivetiti.pdfIn PDF document text
    • http://abimobiliare.pl/pliki/File/2910134167.pdfIn PDF document text
    • http://duocthientam.com/uploads/ckfinder/files/73691211742.pdfIn PDF document text
    • https://nepalimodelagency.com/userfiles/file/mazezijubixuporaxivika.pdfIn PDF document text
    • https://nicklason.se/ckfinder/userfiles/files/zedanoterojigililopaso.pdfIn PDF document text
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/0fc719c20dceb455eb8268020d9ef0e9/mejivaji.pdfIn PDF document text
    • http://allycatering.com/userfiles/51687433261.pdfIn PDF document text
    • http://dental-forum.ru/userfiles/file/8543197606.pdfIn PDF document text
    • http://say-international.eu/userfiles/file/55429911639.pdfIn PDF document text
    • http://hanhthien.net/uploads/file/fudel.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/160bb3dec1d20f---84119496837.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/c9525b08f4297bc56f5664d61280a1f1/losejo.pdfIn PDF document text
    • http://langfordfinancialservices.com/userfiles/files/rijuvitumixulewefezamop.pdfIn PDF document text
    • http://www.pilonidalsinus.gen.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16077b117a33dc---19526133174.pdfIn PDF document text
    • https://www.harasportcenter.com/wp-content/plugins/super-forms/uploads/php/files/ubaeje97degbpkfmpt61b37s13/pokimuruv.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=tamil+girl+baby+names+starting+with+ka+in+tamil+language+pdfPDF 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_off0000ed22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED22 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010534.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10534 16784 bytes
SHA-256: fdd5e498677dbdb123fcb7bbbeefcfb3d312c95f306bfb9cee77eeeb0e9559f5
font_02_sfnt_off000130b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130B8 11320 bytes
SHA-256: cb1e91f9ca8266588afcd09e4e9dcc82bdf5b39678dfd420e5aa420526edc86f

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