Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5dc5edbdc5b4514…

MALICIOUS

PDF

69.4 KB Created: 2021-09-23 11:55:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: d042a578e52642c6ad17d5d46d412018 SHA-1: 2799dded3cb40e5402c6a1a80ce8599458ddee51 SHA-256: d5dc5edbdc5b4514d3b5a1693db9505c3ca06b19730caca8c0a7b8f856943702
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains a link farm pointing to various domains, suggesting an attempt to direct users to malicious websites. The presence of multiple external URIs and a link farm structure indicates a phishing or malware distribution attempt.

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 http://xn--42-6kcdlkbomh7beggito5p.xn--p1ai/userfiles/file/32101879345.pdf In PDF document text
    • https://nadrozmerne-sklo.cz/uploads/86136926991.pdfIn PDF document text
    • https://georeno.ca/userfiles/files/miwoja.pdfIn PDF document text
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/1ipj28b1ebipdvq4m0o5ilp5io/70551842782.pdfIn PDF document text
    • https://stayinbranson.com/ckfinder/triplebuserfiles/file/zusowabagofofodaxil.pdfIn PDF document text
    • https://www.chablis-gautherin.com/ckfinder/userfiles/files/86085880491.pdfIn PDF document text
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/161344b0c118c7---gixipuko.pdfIn PDF document text
    • http://harrodsrentacar.com/public_html/userfiles/file/rabametenogo.pdfIn PDF document text
    • https://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/950123264d4fa2d22e51c3e68fe8518e/zufozon.pdfIn PDF document text
    • http://davidhammerstein.org/userfiles/file/bubagizixob.pdfIn PDF document text
    • https://valerart.com/ckfinder/userfiles/files/kixabu.pdfIn PDF document text
    • http://mn-print.ru/ckfinder/userfiles/files/suxavupipabilukexexur.pdfIn PDF document text
    • http://hataylezzeti.com/resimler/files/fidozudarojonujifawozetud.pdfIn PDF document text
    • https://lmcmanager.com/ckfinder/userfiles/files/5690776301.pdfIn PDF document text
    • http://fruhmann-elektrotechnik.at/xutoged.pdfIn PDF document text
    • http://strandedtattoo.info/file/21653717039.pdfIn PDF document text
    • http://a2kat.ru/userfiles/file/momoxa.pdfIn PDF document text
    • https://namphuctourist.com/userfiles/file/dideda.pdfIn PDF document text
    • https://zzhqhi.com/d/files/27085147575.pdfIn PDF document text
    • https://doctmcooper.com/userfiles/files/51857065351.pdfIn PDF document text
    • http://falerisztika.hu/tmp/6290325189.pdfIn PDF document text
    • https://audreyheselmans.com/_files/file/14943233042.pdfIn PDF document text
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16148e92d1169c---28930971000.pdfIn PDF document text
    • http://eqletstalk.com/uploads/files/202109230902062178.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=lulubox+apk+for+android+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_off0000b3ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3EE 10568 bytes
SHA-256: 5ffb334be21f5775eadb64c1f817596ec1e24b6a3a3325e19421a143d17fedbf
font_01_sfnt_off0000cbe6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBE6 14324 bytes
SHA-256: e6ea0ca9c26add81bd585318219f6f38ad4239b61b5e20de03daf7e90ba8c937
font_02_sfnt_off0000ef82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF82 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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