Malicious PDF — malware analysis report

Static analysis result for SHA-256 09bc910056328fdc…

MALICIOUS

PDF

74.4 KB Created: 2021-09-19 01:15:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 5b9bb87505c21ed74c1bc0c3d36f6c47 SHA-1: ed13c826b52940d083a42d5482dd698c97207da6 SHA-256: 09bc910056328fdc6fd5da61c94549f6c9ee1e3887cb9bf49985768b0dc200ec
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It functions as a link farm, containing numerous URLs that point to various websites, some of which are hosted on compromised CMS upload directories. The presence of these links suggests an attempt to lure users to malicious sites for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://eghamatyab.com/basefile/bainbookcom/files/45579893017.pdf In PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/goan6j4lqfr357o03j99be3mp1/28225186967.pdfIn PDF document text
    • https://my-natural-style.net/upload/files/pibisutodaxakozolulanuz.pdfIn PDF document text
    • http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/54or3vc1a8m2kbjgraptaua9kc/22920403774.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132520c96dc8---bukipika.pdfIn PDF document text
    • https://12shio2.com/contents/files/73336350886.pdfIn PDF document text
    • https://greenlandpark.com/uploads/files/xepilupabugipizaraviwi.pdfIn PDF document text
    • http://daindnc.com/fckeditor/userfiles/file/jeripel.pdfIn PDF document text
    • http://ryouhurt.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/23228019144.pdfIn PDF document text
    • http://kondicionery-lubertsy.ru/upload_picture/file/45732400942.pdfIn PDF document text
    • https://piataafacerilor.ro/app/webroot/files/userfiles/files/5291939351.pdfIn PDF document text
    • https://bostoncake888.com/UserFiles/files/73154798721.pdfIn PDF document text
    • http://gnatowski.pl/attachments/file/jazepimibeloxejovejofeg.pdfIn PDF document text
    • https://suadienlanhhanoi.net/upload/files/73164744181.pdfIn PDF document text
    • https://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c822556cca---79404636469.pdfIn PDF document text
    • https://calienglish.com/ckfinder/images_store/files/xaraxasojotel.pdfIn PDF document text
    • http://mos-craciun-inchiriere.ro/fckfiles/file/zemonugut.pdfIn PDF document text
    • https://myshalewell.com/userfiles/file/nuvegugezowavafewidu.pdfIn PDF document text
    • http://rc-saty.cz/gais/image/file/witidetasilepu.pdfIn PDF document text
    • http://wojno-stal.pl/pliki/file/bepagoxoxagexevomaga.pdfIn PDF document text
    • http://megalaserasia.com/upload///84925949584.pdfIn PDF document text
    • http://futboltotal.net/images/files/90729961673.pdfIn PDF document text
    • https://ezokniga.com/uploads/file/86876911850.pdfIn PDF document text
    • http://kfnmdg.com/upfolder/e/files/20210905082125.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=watch+i+am+a+hero+online+free+english+subtitlesPDF 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_off0000bef1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBEF1 11016 bytes
SHA-256: a52d53a68769ba84d411c71f119c60ffaafb29d90f5204408dbb24f707c21b07
font_01_sfnt_off0000d86b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD86B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f07d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF07D 16860 bytes
SHA-256: 55bd5583d1d1302fa95dad1bc7dd4f03ebbc15e5b5697feb5498f7b4f09bff44