Malicious PDF — malware analysis report

Static analysis result for SHA-256 86d8eb49d4d71cf0…

MALICIOUS

PDF

71.3 KB Created: 2021-09-30 21:03:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 061099b34b337b6869d9517f44f6e358 SHA-1: e46cb903f63d68fe09b09c4062c38621d1c0083d SHA-256: 86d8eb49d4d71cf046d4c4f4bcd284b5ad7847a0889047692ebf7c16f5c6effa
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external links, many of which point to potentially compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or SEO poisoning to redirect users to malicious sites. The presence of embedded JavaScript suggests an attempt to execute malicious code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://lentes123.com/aym_image/files/gokexirisizegaga.pdf In PDF document text
    • http://tg-focus.ru/userfiles/files/lolunelesixivojifo.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133d43d583a5---78856733968.pdfIn PDF document text
    • https://www.tvmreza.tv/ckfinder/userfiles/files/gibibekidukudegul.pdfIn PDF document text
    • http://frchem.cn/upload/files/92873994671.pdfIn PDF document text
    • https://e-uchebnici.com/img/file/natogosevaminixaf.pdfIn PDF document text
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/gm4ac56lpb88sh4r1c5vbtpcfi/juradifajapuriluzowitaj.pdfIn PDF document text
    • https://noursportevents.com/wheelmarine/userfiles/file/34722362150.pdfIn PDF document text
    • http://stagegator.scorchmark.com/stagegator/ckfinder/userfiles/files/65264174201.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/5pc6j3lm2mnlc1o9500l0brvk4/tusevopererofoxorasovaj.pdfIn PDF document text
    • https://granitabrasive.ro/editor_up/mazafunemaminenemiwof.pdfIn PDF document text
    • http://museodegliarazzimarsala.com/userfiles/files/16693788516.pdfIn PDF document text
    • https://www.baust.edu.bd/app/webroot/ckfinder/userfiles/files/vejikeboz.pdfIn PDF document text
    • https://machinex-machines.com/UserFiles/File/sedavoxobizodopod.pdfIn PDF document text
    • http://enidental.com/userfiles/file/20210915235712.pdfIn PDF document text
    • http://vagtteam.dk/userfiles/Files/pivagitofidubogusotevaki.pdfIn PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16153961b7b609---sizopesejutibegun.pdfIn PDF document text
    • http://itaxabc.com/userfiles/file/20210908024816_1520407368.pdfIn PDF document text
    • https://trimix.bg/UserFiles/File/29485297841.pdfIn PDF document text
    • https://www.algeos.com/js/ckfinder/userfiles/files/demapuvuxupunu.pdfIn PDF document text
    • http://airfa.it/userfiles/file/99562983858.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/90380695291.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=move+apps+to+sd+card+rootPDF 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_off0000b27d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB27D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ca8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA8F 17536 bytes
SHA-256: 83b92860e05e6fbef32e1352018e2c396184860f2693034796fb901cf06b9990
font_02_sfnt_off0000f822.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF822 10324 bytes
SHA-256: 4adee211e25d071c5ced640e6b6031cc150f6aaccbbed7133e0a02fe3e2db478

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