Malicious PDF — malware analysis report

Static analysis result for SHA-256 880c9deae14901e3…

MALICIOUS

PDF

72.5 KB Created: 2021-09-05 04:15:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: bdf0b329acba8651419d99561e037e32 SHA-1: 75f88e5e18bf0a89a42e96d07a152215c8723692 SHA-256: 880c9deae14901e3c3cbf0af165be549e0f216ea5e2a97d86515330f7caabfb9
164 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to numerous external PDF files hosted on various domains, some of which appear to be compromised CMS upload directories. The presence of a 'download button' heuristic further suggests a lure to download additional malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 7

  • 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.
  • 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://nfrostov.ru/upload/files/renopirivozaxufulitudolif.pdf In PDF document text
    • http://jshtextile.com/UserFiles/file///84530969368.pdfIn PDF document text
    • https://estidevelopers.com/wp-content/plugins/super-forms/uploads/php/files/7594e12fd7fb950a5c68fe21309ef7ad/92485413604.pdfIn PDF document text
    • https://asthasupermarket.com/userfiles/file/5113564284.pdfIn PDF document text
    • http://basumati.com/app/webroot/ckfinder/userfiles/files/47457052233.pdfIn PDF document text
    • https://www.restaurant-latableedevercel.com/ckfinder/userfiles/files/34417256585.pdfIn PDF document text
    • http://classicalgardenornaments.com/uplds/file/zibegokazopenuf.pdfIn PDF document text
    • https://antoinepanau.com/wp-content/plugins/super-forms/uploads/php/files/2b34077d26ca8e1dda9aab04f54f135a/64208212748.pdfIn PDF document text
    • http://marasintl.com/public/ckfinderuploads/files/zevexebukoto.pdfIn PDF document text
    • https://peperita.it/writable/public/userfiles/file/sawegonaxedaxizolefojova.pdfIn PDF document text
    • https://thejinglelab.com/wp-content/plugins/super-forms/uploads/php/files/gr7qm2fou0ntqq7i91qdpaeteb/sujevezozufenilu.pdfIn PDF document text
    • http://www.tomasjelinek.com/img/pub/file/78892537965.pdfIn PDF document text
    • http://sportgalaktik.sk/userfiles/file/54083933078.pdfIn PDF document text
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e447f6d314---rosowuweromex.pdfIn PDF document text
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cb283233a4e---44266233932.pdfIn PDF document text
    • http://albatrossmrn.com/konadnew/userfiles/file/lafiwavuzitapafunek.pdfIn PDF document text
    • https://onlinendttraining.com/files/kivojuguloguwagabesatax.pdfIn PDF document text
    • https://rendiamovisibiliglinvisibili.org/file/46603405699.pdfIn PDF document text
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/8siu8c00kqujujkdghfo0kcm62/27106409346.pdfIn PDF document text
    • http://greatnice.club/updatefiles/file/fupoliwebuwutiwebagafes.pdfIn PDF document text
    • http://thewellmanteam.com/userfiles/files/36389162540.pdfIn PDF document text
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b987499dc92---butavetewarazo.pdfIn PDF document text
    • http://ablerexthailand.com/userfiles/files/wudekodadexegiji.pdfIn PDF document text
    • https://earplighting.com/wp-content/plugins/super-forms/uploads/php/files/b243e9d18a14197298edba791fa4cf55/94825726247.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=gerund+english+worksheetPDF 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_off0000bb1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB1E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d335.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD335 10680 bytes
SHA-256: 07043f72cfb720a2eefeec2e575140b955bd9d99964375e575626d7776b3fec0
font_02_sfnt_off0000eb76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB76 16040 bytes
SHA-256: 7257afebff0835607c737524abe74022d75b37a6ad02613349314b4500036f71

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