Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c76be0d7f8d4f72…

MALICIOUS

PDF

81.4 KB Created: 2021-09-07 02:00:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 2ce091b425b62257ce4b65b5820f5b39 SHA-1: 31868795e59408fd9574ea96d1275563c3791b05 SHA-256: 1c76be0d7f8d4f72d4b7e33633dbd44eff1b1459d75e70327694ddf9f7f79870
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload storage or disposable hosting, indicating a link farm or redirection scheme. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. No scripts were extracted, and the document body was unreadable, limiting the ability to determine the exact payload or lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://msvadba.ru/files/file/xowalanujofovidiwiwaw.pdf In PDF document text
    • https://ibextrail.com/editor-images/60510583478.pdfIn PDF document text
    • http://victoryelectricalsupply.com/ckfinder/userfiles/files/doreferunimonepebeladuji.pdfIn PDF document text
    • http://ramenzoni.eu/userfiles/files/tunixa.pdfIn PDF document text
    • https://sonarmusic.hu/up_image/file/verewevupokejoviwapupi.pdfIn PDF document text
    • https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/43d67d3ae318f18c08bbcce4501ff201/febujareji.pdfIn PDF document text
    • https://jotekonybakterium.hu/userfiles/files/dobigexopezunidujonokude.pdfIn PDF document text
    • http://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cce4f191e6---xoxudowurevuso.pdfIn PDF document text
    • http://springgalleryng.com/Images_upload/files/30518584570.pdfIn PDF document text
    • https://havadisname.com/upload/ckfinder/files/41676472508.pdfIn PDF document text
    • http://baigeleather.com/userfiles/file/25069301911.pdfIn PDF document text
    • http://www.grundys.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16089226a02ddd---bonudopureziwunar.pdfIn PDF document text
    • http://myredm.ru/uploads/file/27966291185.pdfIn PDF document text
    • https://www.areatransfers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160759e2121822---22856937052.pdfIn PDF document text
    • http://giorgimpianti.com/userfiles/file/42571734227.pdfIn PDF document text
    • http://commissioncollectionlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/65584458640.pdfIn PDF document text
    • http://www.asslar.de/downloads/porojixezejususizavabov.pdfIn PDF document text
    • http://www.stallionreadymix.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1612179a82dfab---26222510269.pdfIn PDF document text
    • https://www.sacict.or.th/ckfinder/userfiles/files/vudebeferolusakune.pdfIn PDF document text
    • http://wpscrm.in/uploaded_files/userfiles/files/bijezeme.pdfIn PDF document text
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9e3ef9b0f5---57189610473.pdfIn PDF document text
    • http://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6ab526a024---50351487924.pdfIn PDF document text
    • https://classconnbio.com/img-jacson/files/79466241486.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=electrolux+appliance+manualsPDF 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_off0000d992.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD992 10720 bytes
SHA-256: e815fe276d011b0b545397aa99abebb0ad9d2d522bf67df3a75f28f59b15f2bd
font_01_sfnt_off0000f22f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF22F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010a41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A41 17828 bytes
SHA-256: 20d650c6e28a3a8e75518f6d53b9097a986be62ca0e92931122571ea65cf044b

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