Malicious PDF — malware analysis report

Static analysis result for SHA-256 9bb64c97af4356b6…

MALICIOUS

PDF

80.6 KB Created: 2021-10-09 07:24:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: d97fa25b5c2e1a055912b85bb83379ae SHA-1: 08497f1aeca3707c6f17ea1943865d030705d421 SHA-256: 9bb64c97af4356b68ebca37d2f0dfc49a0448aaf12949d95f62bd8f158fc8248
156 Risk Score

Malware Insights

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

The PDF document contains a link farm, with many URLs pointing to compromised WordPress upload storage and other disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the heuristic findings and numerous embedded URLs are sufficient to classify this as a malicious link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://bociany.sk/media/file/30219965398.pdf In PDF document text
    • https://lmbri.com/WYSIWYGImage/file/32104234391.pdfIn PDF document text
    • https://4cmedica.com/ficheiros_upload/file/buziwepokotino.pdfIn PDF document text
    • https://www.intermediastudios.com.mx/wp-content/plugins/super-forms/uploads/php/files/5b6f1ef473dfa8c3c808cd5238d3a70a/semejogewikebu.pdfIn PDF document text
    • https://gtnet-engine.com/ckfinder/userfiles/files/tadurumefoxazoxelukefujil.pdfIn PDF document text
    • https://lmcmanager.com/ckfinder/userfiles/files/fowapipiritexonerupilo.pdfIn PDF document text
    • https://chingchia.com/uploads/files/202109191011322971.pdfIn PDF document text
    • http://tuvantindat.com/uploads/2021-09-28/images/files/dubaluwizipawerewud.pdfIn PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16138e5435c923---lumomuxixabub.pdfIn PDF document text
    • http://ride.hu/images/uploads/files/dapivazalupofo.pdfIn PDF document text
    • http://webmba.fr/client/logo/file/4806892017.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/16150681c966a2---ruwulif.pdfIn PDF document text
    • https://tonerihned.cz/userfiles/file/1774005144.pdfIn PDF document text
    • https://dobre-akce.cz/media/files/file/pudisigapivivuxodelelowo.pdfIn PDF document text
    • https://ifbscalidad.eus/files/galeria/files/10450569716.pdfIn PDF document text
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/f755319c4a1a106c519596ec94367a76/86942886088.pdfIn PDF document text
    • http://say-international.eu/userfiles/file/xujonixufete.pdfIn PDF document text
    • http://www.medic-pneumolog.ro/fisiere/file/35610658061.pdfIn PDF document text
    • http://lncxjzxxw.com/upload_fck/file/2021-10-3/20211003155321552041.pdfIn PDF document text
    • https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/d24031e7bcb66e04dd6ce253cb1ee79c/xolanolivoji.pdfIn PDF document text
    • https://www.retake.dk/ckfinder/userfiles/files/59959488937.pdfIn PDF document text
    • http://fusen-es.info/yamituki-n/uploads/files/namolijexovogi.pdfIn PDF document text
    • http://bonezi.morefriendship.com/upload/files/31895325987.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=pangolins+are+found+inPDF 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_off0000d36c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD36C 10532 bytes
SHA-256: 8a47f5fd5ca714d57373d6cb5cb724d26ef278c869e45e2883c93704df6a5170
font_01_sfnt_off0000eb48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB48 19336 bytes
SHA-256: c1bca4888d19cf7ec33fe003f4200cd4995dd913dd10a13dd863e36e62b3af17
font_02_sfnt_off00011d12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D12 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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