Malicious PDF — malware analysis report

Static analysis result for SHA-256 074dcaabdb6fe035…

MALICIOUS

PDF

71.2 KB Created: 2021-10-04 00:33:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 00cb8ffca145b93c451f04de1d9f1ba5 SHA-1: dcaffa6322ae53831e360f8ec724f28984f6d935 SHA-256: 074dcaabdb6fe0357200ea5e1b249cc5e88b5318b347cbb9edce742675e1d11f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external links, many pointing to compromised CMS upload storage or disposable hosting, suggesting a link farm designed to redirect users. The presence of these links and the overall structure strongly suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://queure.ru/uplcv?utm_term=cracking+your+knuckles PDF link annotation
    • http://bangtaisay.com/uploads/userfiles/file/lejediloge.pdfIn PDF document text
    • https://tigapilar.com/upload/files/99697299135.pdfIn PDF document text
    • http://schokobrunnen.com/idata/44983813520.pdfIn PDF document text
    • http://dyglas.com/userData/board/file/dijipuborabemefepuvem.pdfIn PDF document text
    • http://tabletopad.com/images/file/zosekewifiva.pdfIn PDF document text
    • http://asid.rw/userfiles/file/33205015773.pdfIn PDF document text
    • http://ues-rb.ru/themes/ues-rb.ru/files/97282307892.pdfIn PDF document text
    • http://peoplefineart.com/assets/202109/files/20210909035626874674.pdfIn PDF document text
    • http://travelsi.ru/ckfinder/userfiles/files/bejukugoporirow.pdfIn PDF document text
    • http://songhandiban.com/uploadfile/file/2021092405494973499.pdfIn PDF document text
    • https://gbp.dropship-online.com/userfiles/files/60412106474.pdfIn PDF document text
    • https://titishop.co/upload/files/85738807626.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/f044bc3f58d9834ee2bb711042207c17/25505236639.pdfIn PDF document text
    • https://petikdaun.com/contents/files/tedutetisonejuxi.pdfIn PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614263b463dff---mukodesuroboxidanu.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614fc21628974---6772348255.pdfIn PDF document text
    • https://baxsporthorses.com/userfiles/file/fizudifobizonegikigowuxe.pdfIn PDF document text
    • http://pnlestari.com/visitbali/image/files/52808575870.pdfIn PDF document text
    • https://mygenius.ru/admin/ckfinder/userfiles/files/vazuz.pdfIn PDF document text
    • https://zagorjeadventureteam.hr/files/92218030050.pdfIn PDF document text
    • http://merrygoldholidays.com/ckfinder/userfiles/files/suzevuzipatarukakagawop.pdfIn PDF document text
    • http://minerva-collection.net/files/files/tojunuvokizonapebaxo.pdfIn PDF document text
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/161412adf8f62f---36391967129.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140f59903f0d---30099478327.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_off0000b498.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB498 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ccaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCAA 16324 bytes
SHA-256: 635c9e30971ebf9250163a9e37edede4ee6843764d8a3b8e268db29e6eb1ac46
font_02_sfnt_off0000f681.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF681 10644 bytes
SHA-256: 81427c6249e8a5ab8daeb9071214d2b882ee82c33786bb209a75c499670d8b4e

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