Malicious PDF — malware analysis report

Static analysis result for SHA-256 e7094c4b6c3db6ab…

MALICIOUS

PDF

102.3 KB Created: 2021-08-04 17:46:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 7ed811fc75af4eaca34cac78c7501557 SHA-1: 36f680b562d33216b9713d1248a748dc3cd1afee SHA-256: e7094c4b6c3db6ababdd04fef4575ae7cb7044adbe42810d933c252cc1787d1d
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external sites, many of which are hosted on compromised WordPress installations or appear to be part of a link farm. The 'SE_PASSWORD_ARCHIVE_LURE' heuristic indicates the document likely instructs the user to open a password-protected archive, a common tactic to evade initial security scans. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://travelshops.pl/userfiles/file/58527902001.pdf In PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099b9ed0850d---56205190418.pdfIn PDF document text
    • http://clairerolo.com/userfiles/file/87028420086.pdfIn PDF document text
    • http://maynenkhiinverter.com/media/ftp/file/5564573230.pdfIn PDF document text
    • http://www.sevenchurchestour.net/seven/wp-content/plugins/formcraft/file-upload/server/content/files/1607b4d89cecad---pideremo.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/160da1d4e10686---bilotaxaporutedupeb.pdfIn PDF document text
    • http://www.kzhep.in.ua/wp-content/plugins/super-forms/uploads/php/files/4bhmr2fdb2dc9h7d509jl95np5/navufikapirawimatavavax.pdfIn PDF document text
    • http://grupogmec.com/wp-content/plugins/formcraft/file-upload/server/content/files/160772ede14ee0---misonomozebijujedatugezag.pdfIn PDF document text
    • https://netshopnepal.com/userfiles/file/23809530574.pdfIn PDF document text
    • https://sanidom.pl/img/file/88307626898.pdfIn PDF document text
    • https://www.kadeavenue.com/wp-content/plugins/super-forms/uploads/php/files/0c6abda50b49dd72807327b74cee9aad/75603464470.pdfIn PDF document text
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607cbd8b55249---52939135645.pdfIn PDF document text
    • https://vaytieudungtragop.com.vn/wp-content/plugins/super-forms/uploads/php/files/84m8k94ukbst27t01ijs8b4igo/74286287622.pdfIn PDF document text
    • https://rescue.bg/wp-content/plugins/formcraft/file-upload/server/content/files/16090be391a7a7---jujowedapo.pdfIn PDF document text
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c40d7caa5d9---zereruxezutek.pdfIn PDF document text
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608358203258d---baziluferadizunaras.pdfIn PDF document text
    • https://spaslask.pl/wp-content/plugins/super-forms/uploads/php/files/8qjtu7rne71bd3edktllunrb04/duzomokuvivaz.pdfIn PDF document text
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16086940165ee9---73580451362.pdfIn PDF document text
    • https://honghow.com/ckfinder/userfiles/files/79451267617.pdfIn PDF document text
    • https://lostsoulsmemorialnj.org/wp-content/plugins/super-forms/uploads/php/files/4a635a9250b05ddb11dfce4fe56c9459/61047242535.pdfIn PDF document text
    • https://cottonweb.net/userfiles/file/90006598940.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/49c494d50f0b393eb5f8b060c1f2073e/86454943068.pdfIn PDF document text
    • http://gsmontaggi.it/userfiles/files/dumitik.pdfIn PDF document text
    • http://allprintusa.com/admin/images/file/lusirufawavelezef.pdfIn PDF document text
    • https://fedico.ca/upload/editor/file/vezomadipefudebe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=windows+7+ultimate+64+bit+t%C3%BCrk%C3%A7e+indir+utorrentPDF 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_off000123f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123F4 11504 bytes
SHA-256: 4138534044d0f48c4fe17569d6e115417a35b16bf9ab889bc872c629f7dfe1cc
font_01_sfnt_off00013efc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13EFC 19324 bytes
SHA-256: 88a97ce182baa94dc8546a1fb9934fed3d5729c5aac79fce901b09a87a7924fa
font_02_sfnt_off00017044.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17044 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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