Malicious PDF — malware analysis report

Static analysis result for SHA-256 46751d64bdbc1383…

MALICIOUS

PDF

82.4 KB Created: 2021-09-18 01:12:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: ab1c2093150ea5f1749b7678245f0db1 SHA-1: 478ec4fa58005423d6d76b553a3db0b794cef414 SHA-256: 46751d64bdbc1383f3d08ef0783e2dc1bd2d8a651a3276c40b6c922cd5440a94
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and multiple URLs, many of which are part of a link farm hosted on potentially compromised or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is a common technique for executing malicious code within PDFs.

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
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://hkpefa.org/editor_upload/file/veguxamajida.pdf In PDF document text
    • http://nandishoverseas.com/UserFiles/File/13112480959.pdfIn PDF document text
    • http://ipost.mn/ckfinder/userfiles/files/68576911272.pdfIn PDF document text
    • http://pokwuttibut.com/file_media/file_image/file/zovekovojonapilura.pdfIn PDF document text
    • http://www.lircai.com/web/inline/file/webetijasedixum.pdfIn PDF document text
    • http://abwingssuffolk1.com/uploads/files/gijusivilulilabowaru.pdfIn PDF document text
    • http://md-servicios.com/userfiles/file/nabupumilaxijijefumef.pdfIn PDF document text
    • https://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/09dab60fe3e3d2dda8d405fb684dc4e1/zaborevegibewogonofexu.pdfIn PDF document text
    • https://newchat.xyz/js/ckfinder/userfiles/files/89282805938.pdfIn PDF document text
    • http://union.travel/ckfinder/userfiles/files/75027201777.pdfIn PDF document text
    • http://www.ih-consultant.com/ckfinder/userfiles/files/7864954198.pdfIn PDF document text
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614172a9dce5f---rejebob.pdfIn PDF document text
    • http://jogagongu.pl/userfiles/file/pefenaxivaguweli.pdfIn PDF document text
    • http://csc0851.com/userfiles/file/20210910211835_vmjmip.pdfIn PDF document text
    • http://daiichihousing.net/uploads/news_file/48897199618.pdfIn PDF document text
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613904f3ae6ef---75426116191.pdfIn PDF document text
    • https://tatsolarlight.com/uploads/files/31328671293.pdfIn PDF document text
    • https://sitarasign.ir/data/file/68060186546.pdfIn PDF document text
    • http://xn--2e0b95unoa536adofm5h.com/userfiles/file/76969594804.pdfIn PDF document text
    • https://szallas-karpatalja.com/upload/lolunimamaroxo.pdfIn PDF document text
    • http://ttccid.com/userfiles/files/nopekunejiponovapumizi.pdfIn PDF document text
    • http://fundacionecla.org/resources/original/file/92576639112.pdfIn PDF document text
    • http://jingyilin.org/uploads/file/zirutekosedapunagufedew.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=real+car+parking+parking+master+downloadPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000daee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAEE 18080 bytes
SHA-256: 544451c138c9aed3c287a538436e471aa006acc222c93c002f8b712ec63e7acc
font_01_sfnt_off00010a53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A53 11080 bytes
SHA-256: d3119be2e2af9efc0883cc666fb842b5b48f03c5d13a49cdeb6b32d4e0502775
font_02_sfnt_off00012402.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12402 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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