Malicious PDF — malware analysis report

Static analysis result for SHA-256 36608997f1af4682…

MALICIOUS

PDF

74.3 KB Created: 2021-09-24 02:47:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: c23d23338359a4e1326e123189534408 SHA-1: 87b3f70ac53c87002e55f6a6a440fd04906af3a7 SHA-256: 36608997f1af46822fb79884e79bbfc43790ad1095207d6758ac7b4269686a29
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple compromised websites and potentially malicious URLs, such as the one found at 'https://laborke.ru/uplcv?utm_term=kof+97+plus+para+android'. The presence of numerous external URIs and links to compromised CMS upload storage suggests a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://laborke.ru/uplcv?utm_term=kof+97+plus+para+android PDF link annotation
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1612ee8b4bbad2---jotimepenukanibewifubizir.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613b6c5b52546---22747499020.pdfIn PDF document text
    • http://sklepjola.pl/userfiles/file/42463604558.pdfIn PDF document text
    • https://textosolutionslinguistiques.com/upload/editor/file/gepewaximekamoxo.pdfIn PDF document text
    • http://www.solarwindependence.com/ckfinder/userfiles/files/28761966147.pdfIn PDF document text
    • http://fusen-es.info/yamituki-n/uploads/files/gegafijir.pdfIn PDF document text
    • http://rsst77.ru/upload/files/kutitobovowunavaxogorez.pdfIn PDF document text
    • http://descanso.verareyes.com/ckfinder/userfiles/files/nuzarajirur.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/1614b3666a0554---tiriperoragikufogixixufa.pdfIn PDF document text
    • https://eqonetech.com/upload/userfiles/files/fijekoxobitabuxefadalexu.pdfIn PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/161494d075c84f---pegogitedibizupop.pdfIn PDF document text
    • https://mp2020.csysadmin.com/ckfinder/userfiles/files/92936601896.pdfIn PDF document text
    • https://vgi-vn.vn/app/webroot/img/files/fejipulodu.pdfIn PDF document text
    • http://jindi2010.com/uploadfile/files/86922702758.pdfIn PDF document text
    • https://cplastik.com/data/cms/file/wutobusad.pdfIn PDF document text
    • http://vansuloi.com/uploads/userfiles/file/15277176202.pdfIn PDF document text
    • http://ccforum.kr/uploads/file/1631817988.pdfIn PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613263b4b00e3---vafuwerowanevesabutamo.pdfIn PDF document text
    • http://theaterbuehne-schwandorf.de/userfiles/file/liluniwixego.pdfIn PDF document text
    • https://pilot-nav.socksnbows.com/ckfinder/userfiles/files/88552749104.pdfIn PDF document text
    • http://falegnameriacastiglione.it/userfiles/files/54274699116.pdfIn PDF document text
    • https://superpackeg.com/userfiles/file/76219850293.pdfIn PDF document text
    • http://currycornersugarland.com/admin/images/file/mobevisadorobeniwi.pdfIn PDF document text
    • http://aminotp.com/upload/files/junuzigifixarekego.pdfIn PDF document text
    • https://ph2020.org/FCKeditor/file/mabijolekapisexilisanuge.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_off0000becd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBECD 17428 bytes
SHA-256: 6236c82bf2368ddbcca2e629ecf23deffb737288fe9d19a11173932fa3667ebe
font_01_sfnt_off0000eb54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB54 10572 bytes
SHA-256: c3c5a024efa76d665f6bac5f9326c56c423b7b4386836e64160e377b73bbf6bc
font_02_sfnt_off00010395.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10395 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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