Malicious PDF — malware analysis report

Static analysis result for SHA-256 74628473d1746e10…

MALICIOUS

PDF

88.8 KB Created: 2021-09-06 08:58:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 4374695276c085ac1528ad72c06436d1 SHA-1: d44ccdd12777ba7586cfeec07d13497625466641 SHA-256: 74628473d1746e109b34f6f0accf0ef6d87cab6c8fa90ac209b366da6b045a8b
196 Risk Score

Malware Insights

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

The PDF contains numerous URLs, many hosted on compromised or disposable domains, suggesting a link farm designed to redirect users to phishing or malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of a 'LOLBin token sequence' in the document text, along with the PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics, points to a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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://infrive.ru/uplcv?utm_term=comics+marvel+espa%C3%B1ol+gratis+pdf PDF link annotation
    • http://adabaskimerkezi.com/upload/file/75074628394.pdfIn PDF document text
    • https://broadstripe.com/wp-content/plugins/super-forms/uploads/php/files/1f32ad3e2749c1545e57c9c00a85e605/buximojujexinarazesug.pdfIn PDF document text
    • http://dragonera.cn/admin/userfiles/file/32768644291.pdfIn PDF document text
    • http://shiokuda1.com/contents//files/witobemiwum.pdfIn PDF document text
    • http://telegid.tv/userfiles/files/sufegufamate.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16118c11ca0639---91096287776.pdfIn PDF document text
    • http://parfumerieindex.nl/images/uploads/89643014856.pdfIn PDF document text
    • https://iphonerepairservice.nl/app/webroot/files/userfiles/files/susut.pdfIn PDF document text
    • https://olivierdaulte.com/ckfinder/userfiles/files/sawogumemopesujukatage.pdfIn PDF document text
    • https://paeonia.ch/userfiles/files/95358294733.pdfIn PDF document text
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607edc7547d04---luxovagetufadogefutevut.pdfIn PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160ac79d24efe3---busikidelejanapikedo.pdfIn PDF document text
    • http://studioingegneriavaragnolo.com/userfiles/files/mifefipetezuwewazigi.pdfIn PDF document text
    • https://aduanaldelvalle.com/userfiles/file/medifix.pdfIn PDF document text
    • https://www.3dreamchurch.com/wp-content/plugins/super-forms/uploads/php/files/c6ea102812388d88d82cfe47aff1242a/33397499545.pdfIn PDF document text
    • http://senseoftourism.dk/userfiles/file/36206206732.pdfIn PDF document text
    • https://aykutemlak.com/upload/ckfinder/files/49792759247.pdfIn PDF document text
    • http://shuimotongyuan.com/userfiles/file/nofijevix.pdfIn PDF document text
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/161197c36ac089---16403783624.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/b6f63880e692a7e079f7daa99d3c8173/kepifubodinizom.pdfIn PDF document text
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/pka2ecmdfbr461h8emqvjh2ja9/losalapobusowisiseriz.pdfIn PDF document text
    • http://txextremecarts.com/userfiles/file/52573485851.pdfIn PDF document text
    • http://blueyee.com/upload/file/092201208864.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_off0000efad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFAD 19524 bytes
SHA-256: 8052b1b000e883ffade00d886bce7db5bf3461527be931e090b5151f9a400fe7
font_01_sfnt_off00012211.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12211 11160 bytes
SHA-256: 74800691ead116055c5a235f1208c345065e7eb9d7f081dcd5dd7ff4d6bfda6b
font_02_sfnt_off00013bfb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13BFB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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