Malicious PDF — malware analysis report

Static analysis result for SHA-256 38f0f91b8f212b6f…

MALICIOUS

PDF

85.2 KB Created: 2021-09-13 04:58:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-27
MD5: bcf8af897cabab0239b34a32aa8c407d SHA-1: e5302953721e939940a50516a48c18cf3e09ae9c SHA-256: 38f0f91b8f212b6f6cef5c9fb86130423445beb4fe69864d303d92636ca74dad
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to various domains, some of which are hosted on compromised WordPress sites or disposable hosting. This pattern is commonly used to distribute phishing content or redirect users to malware download sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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=undefeated+superhero+game+android PDF link annotation
    • http://interstroy96.ru/uploads/files/gefinepabevifuguna.pdfIn PDF document text
    • http://www.roosprommenschenckelfoundation.nl/ckfinder/files/files/58299688305.pdfIn PDF document text
    • http://woodbridgeabw.com/uploads/files/rebizivufu.pdfIn PDF document text
    • http://caphegiabao.com/upload/fck/file/64332467521.pdfIn PDF document text
    • https://pointvirgule.ca/upload/editor/file/ziwojawotitufoxibo.pdfIn PDF document text
    • http://skupka23.ru/upload/m/33220521682.pdfIn PDF document text
    • https://perfecthospitals.org/ckfinder/userfiles/files/30661089351.pdfIn PDF document text
    • http://hansungidschool.com/userfiles/file/sinavimevewawilawuk.pdfIn PDF document text
    • https://pankajplast.com/ckfinder/userfiles/files/zipigijew.pdfIn PDF document text
    • http://change4best.ru/upload/file/gafelul.pdfIn PDF document text
    • http://asorokolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/rigegoxitixase.pdfIn PDF document text
    • http://szjwwj.com/userfiles/file///36711077957.pdfIn PDF document text
    • http://polyalpan.hu/_user/file/14117573940.pdfIn PDF document text
    • http://nhadep30giay.com/uploads/image/files/pafurexuzim.pdfIn PDF document text
    • http://rnralpha.cz/res/file/nevomujulitu.pdfIn PDF document text
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/e0eb065282b1c1bec2a707cbfbe84ce8/zezezidi.pdfIn PDF document text
    • https://bestrecycledautoparts.net/images_i/file/41272722291.pdfIn PDF document text
    • https://pcetravel.com/files/file/gatixujabiwedisunalipifu.pdfIn PDF document text
    • https://gauravkankariya.com/wp-content/plugins/super-forms/uploads/php/files/6500c65a2552608acf70211b90935156/87382244564.pdfIn PDF document text
    • https://riosemarescentrodemergulho.com/ckfinder/files/64970961897.pdfIn PDF document text
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/531a734fddadeeb61608947663f94a35/5346148303.pdfIn PDF document text
    • http://ryukatsu.com/userData/board/file/37613038816.pdfIn PDF document text
    • https://hanomanberjaya.com/contents/files/nakanerironewi.pdfIn PDF document text
    • http://z-sinpro.com/upload/files/sofedidexu.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_off0000e9bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9BF 11008 bytes
SHA-256: 37399a478d67e193643ffab33adfe666d3e813b04a371d5e166c5bb830d78961
font_01_sfnt_off000102e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102E9 17008 bytes
SHA-256: c77d22f1177aab4d10f6497e92fe739efa332c6d4974aca74f82cce9c3b5125f
font_02_sfnt_off00012e8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E8E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1