Malicious PDF — malware analysis report

Static analysis result for SHA-256 b79e69d9e04a270a…

MALICIOUS

PDF

84.4 KB Created: 2021-08-05 07:05:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: 026abca554d36b77a7c9a2390f94360d SHA-1: 8d3ad4d85b170042e234b382bcc7edbcdfa217bf SHA-256: b79e69d9e04a270abd1d4e874a2e04492871c6e0921d7ed9d64d21e4db550e69
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/d5b0a38188ffcbd10af65d4e6b8fc38c/76966005329.pdf In PDF document text
    • http://ckattorneys.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/kexubaw.pdfIn PDF document text
    • https://xn--i1aam8cb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/ce69385357f9a78a2f6958f160df28f6/dukaxivevuzoruwivozutuven.pdfIn PDF document text
    • http://kagoshimakojintaxi.com/userfiles/file/webofesugotadinuxifoto.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/th0rt7sn14oli0aci1t5lkkdka/sitirupodorexemuribi.pdfIn PDF document text
    • https://ovistar-dz.com/ckfinder/userfiles/files/74587887689.pdfIn PDF document text
    • https://law.myvzl.com/wp-content/plugins/super-forms/uploads/php/files/dacu70odrbukpecm82gjkm3i0v/44287940358.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160ba760d3c888---63730756836.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/93753560428.pdfIn PDF document text
    • https://malashealthcare.com/userfiles/files/karipekuripoxiv.pdfIn PDF document text
    • http://spec-so.ru/sites/default/files/file/vogaxitadigamepogonamul.pdfIn PDF document text
    • http://yongqingtech.com/d/files/50494118782.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/ae4f097da4c404f177d9900745f87163/53441890917.pdfIn PDF document text
    • https://thejinglelab.com/wp-content/plugins/super-forms/uploads/php/files/jnkf3vgoj2v4hooimrjuiresih/jesomiwokurodukoj.pdfIn PDF document text
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607268e494a81---wajafepuxevopuwunij.pdfIn PDF document text
    • https://vicentinacentroautomotivo.com.br/ckeditor/ckfinder/userfiles/files/zevazasari.pdfIn PDF document text
    • https://motelandratecuci.ro/userfiles/file/furemaburodewez.pdfIn PDF document text
    • https://vivaldiroberto.com/img/files/mediafiles/file/kakatajatonago.pdfIn PDF document text
    • http://cathugo-yachts.de/res/wysiwyg/file/51547643568.pdfIn PDF document text
    • https://www.americansummercamps.com/wp-content/plugins/formcraft/file-upload/server/content/files/160888e6eafc64---fixazotupejotok.pdfIn PDF document text
    • https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/ore5vlkhcs4nv744d1nab2sf6u/javesidaralokofibegojeju.pdfIn PDF document text
    • https://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d3580c1b50---pobin.pdfIn PDF document text
    • http://dijladentalcenter-qa.com/userfiles/file/gesogod.pdfIn PDF document text
    • http://sun-eko.eu/files/file/50334088407.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=best+live+tv+apk+2020PDF 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_off0000e68a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE68A 17348 bytes
SHA-256: 1b509a0f81ac8c657bddac1ddbbb04657e36037e063e5296ed68591b3449cf1c
font_01_sfnt_off00011446.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11446 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012c5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C5D 10376 bytes
SHA-256: c7ec0062cc58d94a470eba9230f95ac7d50effaf82109b0d5c2aa84542c78b79