Malicious PDF — malware analysis report

Static analysis result for SHA-256 56f9a75654d0a44f…

MALICIOUS

PDF

82.1 KB Created: 2021-09-13 09:49:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 831daf2784192bb07184444f6549a156 SHA-1: 7f827c0a435067584f3babf9e9e2439ed3711fcb SHA-256: 56f9a75654d0a44fb1cc902f3a26c1dc43ae671019a2cb54abcfc899979185bc
156 Risk Score

Malware Insights

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

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external URIs and link farm patterns, indicating an attempt to redirect users to potentially compromised or malicious websites. The presence of multiple links on disposable hosting and the use of 'utm_term' parameters suggest a phishing or spam campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://crysiq.ru/uplcv?utm_term=simulacra+found+phone+horror+mystery+apk PDF link annotation
    • https://leuphuotcamap.com/uploads/image/files/12792674200.pdfIn PDF document text
    • http://osc-pribor.ru/products_pictures/file/wumimumepuf.pdfIn PDF document text
    • https://natyabio.com/uploadfiles/51604339414.pdfIn PDF document text
    • http://shatalarab-llc.net/userfiles/files/xitulojofozetakij.pdfIn PDF document text
    • https://www.popcaffe.it/wp-content/plugins/super-forms/uploads/php/files/3816db8588fd1947058d4e331932c153/49470780092.pdfIn PDF document text
    • http://pdww.ru/ckfinder/userfiles/files/lewaladoxe.pdfIn PDF document text
    • http://msslink.ru/userfiles/files/98086087871.pdfIn PDF document text
    • https://forumsevens.com/images/file/xawebabizojuvajiderejevo.pdfIn PDF document text
    • http://ckrestaurantgroup.com/ckfinder/userfiles/files/9771212349.pdfIn PDF document text
    • http://orthodoxvaidikasanghom.org/userfiles/file/dekugufolobudedodu.pdfIn PDF document text
    • https://kingcarmotorista.net/uploads/files/lulivuxenugimerigisux.pdfIn PDF document text
    • https://raljob.com/userfiles/file/lijuwososewobixi.pdfIn PDF document text
    • https://ms02bet.net/contents/files/32337976978.pdfIn PDF document text
    • http://swancentive.com/cote_dor_import/admin/ckfinder/userfiles/files/17520230650.pdfIn PDF document text
    • http://olguanaokulu.com/upload/file/luzapekufatuneviwinajit.pdfIn PDF document text
    • http://e-skala.pl/userfiles/file/3915023844.pdfIn PDF document text
    • http://twapp.freshkon.com/upload/files/nododedukotux.pdfIn PDF document text
    • http://skinct.com/upload_file/file/Fl202109091024352251.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1612fe3131cf5f---46806555007.pdfIn PDF document text
    • http://print-printonline.com/ckfinder/userfiles/files/rupoxuxu.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/16139cbcc1e21a---xirutozebijabosa.pdfIn PDF document text
    • https://omprintandpack.com/userfiles/file/48292352095.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_off0000d828.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD828 18420 bytes
SHA-256: f0f1ff6fc3ba49cd5df1644971c17f5413c02238615b205943dbf239af18d17f
font_01_sfnt_off00010829.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10829 11264 bytes
SHA-256: 654cbb8ace198bcc52b1deb2c1835dfa12505716c8ae7528d5e8033f42bd10d7
font_02_sfnt_off0001226c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1226C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1