Malicious PDF — malware analysis report

Static analysis result for SHA-256 cbad06885a4b40fe…

MALICIOUS

PDF

80.6 KB Created: 2021-09-18 06:48:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: fed3d60ca96252d63df73ef0a52a07f7 SHA-1: f57cc2c535f82caf9bc683c774e16aedd63943e5 SHA-256: cbad06885a4b40fe087c4c6d3a465f872bbde3970f10ad4e8f86685499c710f1
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are hosted on disposable domains or compromised CMS uploads, suggesting a link farm designed to redirect users to malicious content. The 'SE_PASSWORD_ARCHIVE_LURE' heuristic indicates that the document may be instructing users to open a password-protected archive, a common tactic to bypass gateway security. ClamAV detection and ML classification confirm the malicious nature of the file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://crewmak.ru/uplcv?utm_term=lock+screen+removal+free PDF link annotation
    • https://0922.sproname.com/files/userfiles/files/riwigarulefafigabimeluj.pdfIn PDF document text
    • http://psystems.gr/Administrator/uploads/userpics/OutPostImages/files/vonopawoparotip.pdfIn PDF document text
    • https://calienglish.com/ckfinder/images_store/files/46079544460.pdfIn PDF document text
    • https://ice-group.pl/userfiles/file/pesupulovamavikezujas.pdfIn PDF document text
    • http://lotusburbank.com/uploads/files/katefulufexufilekasi.pdfIn PDF document text
    • http://xn--80aaa1acmiejxr6d7fg.xn--p1ai/data/files/31253052098.pdfIn PDF document text
    • https://liur-krd.ru/userfiles/file/36216008768.pdfIn PDF document text
    • http://purplebyanki-com.bvirani.com/ckfinder/userfiles/files/47080454835.pdfIn PDF document text
    • http://tomasmrazek.cz/userfiles/file/83514231350.pdfIn PDF document text
    • https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/161336d7e6532c---56505408706.pdfIn PDF document text
    • http://kuresi-kaitori.com/upload/content_pic/files/68206707091.pdfIn PDF document text
    • https://yaslibakicisi.net/userfiles/file/28425330052.pdfIn PDF document text
    • http://musicpark-live.de/userfiles/file/judadowananadidalolo.pdfIn PDF document text
    • https://mdteam.se/ckfinder/userfiles/files/jesunajutigiteze.pdfIn PDF document text
    • http://azinsaghf.com/cache/fck_files/file/nodakowufemorek.pdfIn PDF document text
    • http://etalentlink.com/uploadfile/file///2021091806494991.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/1d5f2ce93178141625dd2d4aaa2f450c/36014262710.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141e3e1a51e6---raboregoparufamibefefi.pdfIn PDF document text
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16142947d410d8---41568082020.pdfIn PDF document text
    • http://35ct1.com/images/ckImageFiles/files/basinixab.pdfIn PDF document text
    • http://mosme.org/uploadfile/files/77901198437.pdfIn PDF document text
    • http://a-mega.ua/images/uploads/file/78925135168.pdfIn PDF document text
    • http://bhavalaya.org/ckfinder/userfiles/files/44492376569.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_off0000d84f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD84F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f066.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF066 10420 bytes
SHA-256: 01cc7a2f90c08b9cd40cccedacc7b3bbda53dca3cc7b9ba0d9cfc10ee41c1f4a
font_02_sfnt_off0001080a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1080A 17684 bytes
SHA-256: 20987f34d9445c6eec5c72153c86f1f544343e5ed7980f0f73619935e98721fd

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