Malicious PDF — malware analysis report

Static analysis result for SHA-256 b82bc50925cda23c…

MALICIOUS

PDF

84.6 KB Created: 2021-07-14 05:45:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 6616a9559c0288023db80c329102b7bf SHA-1: b020db10f4c2580bf515a0593db6c802fe30d85c SHA-256: b82bc50925cda23cfec4a37b83c295d5c94e419d4c1e8ccb99bde129a54a273f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document functions as a link farm, directing users to various websites that host other PDF files. The primary URL suggests a lure for downloading a game, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly support its malicious nature, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://inwebjor.ru/uplcv?utm_term=gta+iv+free+download+for+windows+10 PDF link annotation
    • https://netwindowvn.com/uploads/userfiles/file/96494075986.pdfIn PDF document text
    • http://www.nisbd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4020be974c---99035148146.pdfIn PDF document text
    • http://wypelnienia.kratex.pl/wp-content/plugins/super-forms/uploads/php/files/070f591cf62ab886db1635da4c6921dd/xakefofamavalanaxer.pdfIn PDF document text
    • http://atek-ent.com/upload/file/33134096752.pdfIn PDF document text
    • https://globaltranslation.com/demo/global_translation/beta/userfiles/files/bemedevapun.pdfIn PDF document text
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c90102a4e19---29778573691.pdfIn PDF document text
    • https://e-uchebnici.com/img/file/tapuxixukiromufamum.pdfIn PDF document text
    • https://www.beadvised.co.uk/wp-content/plugins/super-forms/uploads/php/files/df7343781aa575dd560730c46fa57364/51784354410.pdfIn PDF document text
    • http://giasudaihocsupham.com/Images_upload/files/11827530661.pdfIn PDF document text
    • https://www.corpeverest.com/ckfinder/userfiles/files/pokipovorami.pdfIn PDF document text
    • http://jandenzobv.com/image_uploads/file/3681863896.pdfIn PDF document text
    • http://logo4you.dk/userfiles/file/27902207417.pdfIn PDF document text
    • https://perfecthospital.net/FCKeditor/file/66086488672.pdfIn PDF document text
    • https://mumegram.com/userfiles/file/jasagimukof.pdfIn PDF document text
    • https://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/7he1r8u4u88e4r5fk4btlfr866/99752654761.pdfIn PDF document text
    • http://geostudio.eu/userfiles/files/sonawikozifag.pdfIn PDF document text
    • http://pericosrentcar.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1608010dc0d69b---tinukifusim.pdfIn PDF document text
    • https://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084d5a1e5618---2105507314.pdfIn PDF document text
    • http://htwy.com/upload/file/3687454647.pdfIn PDF document text
    • http://wawa757.com/uploads/files/15910476222.pdfIn PDF document text
    • http://babywagen24.de/userfiles/file/28719253414.pdfIn PDF document text
    • http://neilreardon.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/42656727156.pdfIn PDF document text
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/160e3803399531---4749419264.pdfIn PDF document text
    • 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_off0000e783.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE783 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ff95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF95 16692 bytes
SHA-256: 2adfc7e3fbe05cc06bec480dd21c02108ebc664178e2f35c44a974a2393a70b8
font_02_sfnt_off00012a7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A7D 10712 bytes
SHA-256: ea00a5b1af6283a1367d6ddd9c6be1dfc9981447e7d1b56d645074d915b59e54

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