Malicious PDF — malware analysis report

Static analysis result for SHA-256 540bd9215b82ec75…

MALICIOUS

PDF

101.0 KB Created: 2021-08-12 18:26:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 553db52f185e6fedda00193daa2d6997 SHA-1: 7d9dee0e843595e24e7cdebb0a6ff2c9f459a862 SHA-256: 540bd9215b82ec75df4bf5a73b85cdd5045edbe7d2a77c4cacff5b7cb67bfef3
156 Risk Score

Malware Insights

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

The PDF file contains a link farm pointing to multiple compromised WordPress sites, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The presence of numerous external URIs and links to compromised CMS uploads supports the classification as a malicious document, likely intended to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae266bc36aa---kolan.pdf In PDF document text
    • http://myphamso1.net/uploads/files/korineterupiwomogota.pdfIn PDF document text
    • https://singaporeroadshow.com/wp-content/plugins/super-forms/uploads/php/files/9dde37ed28b662d6f47178b546ee6e6d/sukotixubawuronaviv.pdfIn PDF document text
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a5f9784b2f0---20412678173.pdfIn PDF document text
    • https://binarbaidrealestate.com/public_html/userfiles/file/12566744998.pdfIn PDF document text
    • https://davaocarrental.com/images/file/paxofuzis.pdfIn PDF document text
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/3134b8cf2c993c102a4f9e51c708551a/limakisogazu.pdfIn PDF document text
    • http://edukoc.net/userData/ebizro_board/file/mawakegeribonid.pdfIn PDF document text
    • http://denkobarbell.com/_upload/files/93902132829.pdfIn PDF document text
    • https://www.infratechgroep.nl/wp-content/plugins/super-forms/uploads/php/files/1cce465f9970a011eb2c35e16fb956e8/miduzozipuresutaladaravov.pdfIn PDF document text
    • https://ita.kru.ac.th/ckfinder/userfiles/files/zeravob.pdfIn PDF document text
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e1e77f380fd---78519261047.pdfIn PDF document text
    • https://kisikana.hr/UserFiles/files/12330273667.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/4avok6s9cpkur3a0uln5l5io71/4822810684.pdfIn PDF document text
    • https://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/du465r8ppok2edt85frda299r6/15899058090.pdfIn PDF document text
    • https://oiweld.com/wp-content/plugins/super-forms/uploads/php/files/88a06895b2c58e80c30f7a5879b08152/jalasasefosof.pdfIn PDF document text
    • https://virker-ikke.dk/files/momazafe.pdfIn PDF document text
    • http://ingpiazza.eu/userfiles/files/53775268753.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/nqc98tbeegk61oqd3ptj74hbm2/5636253903.pdfIn PDF document text
    • http://apnorajasthan.net/userfiles/file/2138955202.pdfIn PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607def8c4538b---15073644869.pdfIn PDF document text
    • https://bikinibody.be/wp-content/plugins/super-forms/uploads/php/files/78742ruo2bcd47vnu0hthqr7nd/baxifuguludilugizotelegej.pdfIn PDF document text
    • http://guides2alpes.fr/uploads/file/lemenopuretuzukazogur.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=rental+lease+agreement+californiaPDF 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_off00012443.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12443 17816 bytes
SHA-256: b9de6072977fb094182cb7bc8f9257353f9d1ef3ed45494ca2802cc63faa8b67
font_01_sfnt_off0001534b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1534B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00016b62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16B62 10724 bytes
SHA-256: fada447f684fae71719d626287b504faa3be4e060545206364ebaab37c4a7c74