Malicious PDF — malware analysis report

Static analysis result for SHA-256 6037e680a3ef8094…

MALICIOUS

PDF

91.6 KB Created: 2021-08-25 11:59:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 5d6cb02527e916ca00e96affeae8711c SHA-1: d577ee1a61326e98056e91bb820642c985bf41bb SHA-256: 6037e680a3ef8094706e9cf6cfa4c84c1d08bc3bb5eec7ceadef7fd61193cafa
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the heuristic firings point to the document's primary function being to host and distribute links to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://pokewaveanaheim.com/uploads/files/5911801693.pdf In PDF document text
    • https://eventaipei.com/upload/files/89831122727.pdfIn PDF document text
    • http://historico.uts.edu.co/portal/app/ckfinder/userfiles/files/suronas.pdfIn PDF document text
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/dd253be99f247ff95fb78fc1d239ee8e/54885331473.pdfIn PDF document text
    • https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/sjbtcs0hb80icku0o3lrrc2ni4/89930976255.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160b89f76e01ea---12531122385.pdfIn PDF document text
    • http://www.lebedosapartotel.com/data/yukle/files/78109420445.pdfIn PDF document text
    • https://kassa-evotor.ru/wp-content/plugins/super-forms/uploads/php/files/ek5hutfsfj0alal1rpbv752vsh/zusuzefolegikul.pdfIn PDF document text
    • https://stopserv.ru/files/file/90068519650.pdfIn PDF document text
    • http://ambulatorioveterinariopisillibertozzi.eu/userfiles/files/3568479998.pdfIn PDF document text
    • https://0900107678.com/upload/file/famisidarilagor.pdfIn PDF document text
    • https://activepymes.com/pub/file/96259380711.pdfIn PDF document text
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/lj7rtmh0pcl2f7a2rtti7cv8d2/pidek.pdfIn PDF document text
    • http://www.molinoag.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081dcd06ed2c---gigugusokofesujejivudale.pdfIn PDF document text
    • https://paklya.su/design/img/upload/file/55846886842.pdfIn PDF document text
    • https://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/66aca0ba88cc6f6c2f4490c6572ada40/nuvutafuwixonofasa.pdfIn PDF document text
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/7e74c732450a0d92f1b56cfe316d1c92/25496192567.pdfIn PDF document text
    • https://www.cibaospalaser.com/wp-content/plugins/super-forms/uploads/php/files/4tsu462bg8ggmthh5iedraepbb/lufekivej.pdfIn PDF document text
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1607c9a9daec98---rekejilusuredelafatu.pdfIn PDF document text
    • https://oxi-dental.ro/imagini_ws/66745521754.pdfIn PDF document text
    • http://qca.ch/userfiles/file/rokawenemezisinemuvikulo.pdfIn PDF document text
    • http://sosnovgeo.ru/userfiles/file/kitoxunepofazipujusifa.pdfIn PDF document text
    • http://arebiatours.com/uploads/files/29030487493.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=7+habits+of+highly+effective+people+read+onlinePDF 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_off00010252.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10252 16932 bytes
SHA-256: 80995cdf5e7fe18210ea6020fe7127aa434ae08ad4384ddce77f5f554f2516f2
font_01_sfnt_off00012e66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E66 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001467d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1467D 11172 bytes
SHA-256: 53172fdbbfdefa1c97dc9faa0a44ad036d35cd514a42f58fd33e9cfeb32faf03

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