Malicious PDF — malware analysis report

Static analysis result for SHA-256 52838501f67f1d71…

MALICIOUS

PDF

94.4 KB Created: 2021-09-01 01:59:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: a63b5ac2157c8cefe7e96b7d3b61231e SHA-1: 195f411af0685b84a8c02f3ac80cc645302cc38f SHA-256: 52838501f67f1d719086c605fe43ece7d27a366d0bfb2ea2f321e4e5d1f8d4c1
156 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as 'Pdf.Phishing.Trojan' and an ML classifier indicated a high probability of maliciousness. Heuristics identified the document as a link farm pointing to compromised WordPress upload storage, suggesting an attempt to trick users into downloading malware. The embedded URLs are likely part of this phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9925

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://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082bfdc1c715---56834132494.pdf In PDF document text
    • http://kolkandkolkdesign.com/site/data/ws/files/janujosetetu.pdfIn PDF document text
    • https://dungcuruamui.com/wp-content/plugins/super-forms/uploads/php/files/rtfv635ibpb1gnv8i8padgmboq/bosawiziwepi.pdfIn PDF document text
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a896d475188---86367805202.pdfIn PDF document text
    • http://lynxitservices.com/ckfinder/userfiles/files/59830204328.pdfIn PDF document text
    • http://tikatalog.sk/_files/file/84677562476.pdfIn PDF document text
    • https://senzedigicraft.com/wp-content/plugins/super-forms/uploads/php/files/d2a8a394c59c09256edb86bb24224000/tevipitolulinuwofugozepi.pdfIn PDF document text
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6efcc8958b---ribivu.pdfIn PDF document text
    • https://gdr.co.il/wp-content/plugins/super-forms/uploads/php/files/e472343c1360937aadcf7ef37fb4c279/fuwetuvodiwudiz.pdfIn PDF document text
    • http://worldsocialistpartyindia.org/ckfinder/userfiles/files/75619296575.pdfIn PDF document text
    • http://bilafafafa.com/shopadmin/upload/files/gosomuge.pdfIn PDF document text
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/27d9faee7458ecc206812b9e12e6002e/wenesodinip.pdfIn PDF document text
    • https://ceilford.org/wp-content/plugins/super-forms/uploads/php/files/4c83917a9f88ce8051fd20ed0c7c5a38/40784583006.pdfIn PDF document text
    • https://ankaratemizlikcim.com/depo/sayfaresim/file/21784550066.pdfIn PDF document text
    • http://xn--dlek-5qa.com/admin/UserFiles/file/94059575477.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073fff8ace35---86847305024.pdfIn PDF document text
    • http://cancunday.com/travela/img/files/39931683811.pdfIn PDF document text
    • http://denki-shonan.com/uploadsfile/jewozokosijaxinojunu.pdfIn PDF document text
    • http://ansonseatery.com/uploads/files/36378209635.pdfIn PDF document text
    • https://akproauto.com/nbloom/fckuploads/file/37123029034.pdfIn PDF document text
    • https://twr1115.net/files/fckeditor/file/8995028967.pdfIn PDF document text
    • https://ku4ysk-9lgp4y.com/contents/files/8057876271.pdfIn PDF document text
    • http://gramercy-grand.ru/files/file/ketofazowuwavazulisosa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=how+to+compress+a+pdf+on+macbookPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_008_off00011796.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x11796 18592 bytes
SHA-256: 6b7ef7ff3fd7e3c698d00c486bb3f0316257a3c4945dcc781935d656ff3c4e77
font_00_sfnt_off0000e648.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE648 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fe5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE5F 10952 bytes
SHA-256: 79a93e64953955fecc0dfee40208014c439229629e2d1099b06f9f237e594ba9
font_03_sfnt_off00013504.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13504 20568 bytes
SHA-256: a81272a25d1da0a90de53de7ac5d00a441ab2e19f38be70b6133c78a03f269b6

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