Malicious PDF — malware analysis report

Static analysis result for SHA-256 c655dc5f69cc5802…

MALICIOUS

PDF

83.6 KB Created: 2021-09-21 05:22:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: a382aaff53e2074020e6258fa345c1d8 SHA-1: f2c8654ec2cf92d465a92019e99b7aa2139032fe SHA-256: c655dc5f69cc5802c5de828a4400f9a8f22f3e9ecd7eca8da5bc19015e94f70e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a large number of links, many of which point to compromised WordPress upload directories or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the nature of the links and the PDF structure point towards an attempt to trick users into downloading further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://queure.ru/uplcv?utm_term=just+dance+download+apk PDF link annotation
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134d15d8dd67---83534171586.pdfIn PDF document text
    • http://delfosventures.com/userfiles/files/76377138408.pdfIn PDF document text
    • https://gencshoworganizasyon.com/upload/ckfinder/files/50078253737.pdfIn PDF document text
    • http://www.romanschatztruhe.de/img/files/90603776722.pdfIn PDF document text
    • http://exms.fr/sites/default/files/file/bigixewatadoxirimudaniba.pdfIn PDF document text
    • https://stgeorgedentalcare.in/ckfinder/userfiles/files/86025978295.pdfIn PDF document text
    • http://cachnhietwin.com/luutru/files/92839056870.pdfIn PDF document text
    • http://studiodugnani.it/userfiles/files/rojigob.pdfIn PDF document text
    • http://saraya-shop.ru/upload/files/91243321350.pdfIn PDF document text
    • http://aolisenjiancai.com/data/files/nafomudojivitigiromo.pdfIn PDF document text
    • http://gradn.ru/uploades/fckeditorfile/jokifunepexibipak.pdfIn PDF document text
    • https://donnasalon.ru/wp-content/plugins/super-forms/uploads/php/files/7a4ca21bdf7de5e434fde9ae2ec0e9b3/fegasobetujatujifib.pdfIn PDF document text
    • http://tincorner.vn/uploads/files/dokilawagagaramotaripok.pdfIn PDF document text
    • http://iphonedown.com/ckfinder/userfiles/files/ladesevuropizamowinagemo.pdfIn PDF document text
    • http://www.anaja-inter.org/public/file/27605694744.pdfIn PDF document text
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/161356a27e0dd5---fotidilujoxerodojen.pdfIn PDF document text
    • http://mecateengenharia.com.br/ckfinder/userfiles/files/juwesi.pdfIn PDF document text
    • http://erictex.com/ufiles/files/9646851775.pdfIn PDF document text
    • https://eliteswimmingpoolsinc.com/wp-content/plugins/super-forms/uploads/php/files/vtnvgp5n6gfk7870rcqh7i0i15/7972359359.pdfIn PDF document text
    • http://shannonlakeestates.org/fck_images/file/tituxekelivejosasunuweju.pdfIn PDF document text
    • https://o-dance.com/upload/files/taluxuworerim.pdfIn PDF document text
    • https://afma.pt/site/upload/file/zawenujuzegurejafikujufup.pdfIn PDF document text
    • http://hani-bee.com/userfiles/files/jigufamafazitafawuziti.pdfIn PDF document text
    • http://www.introspekta.si/ckfinder/ckeditor_uploaded_files/files/dezuma.pdfIn PDF document text
    • https://cleanenergy.mn/uploads/files/lavekaj.pdfIn PDF document text
    • http://cluster006.ovh.net/~greeters/namur/ckfinder/userfiles/files/rogugelulazuzufebedidi.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_off0000dffc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFFC 10584 bytes
SHA-256: c4c1b35de2285f9c21e504bda9b05575d830ffb9499f8960cb1b169dda562037
font_01_sfnt_off0000f86b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF86B 18424 bytes
SHA-256: cae60e0ee6922864c1ed8de82aa23f89f9261cd69fb4dbaae7126e96c9882663
font_02_sfnt_off00012884.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12884 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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