Malicious PDF — malware analysis report

Static analysis result for SHA-256 b984612386bb4fa1…

MALICIOUS

PDF

91.6 KB Created: 2021-08-14 10:31:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: fd3e5fd2e1267628c3f71ddc31a878d6 SHA-1: 66eda3a52cafc85bdccb591ad439866b4a4b5fa6 SHA-256: b984612386bb4fa16aac4a033407f9b8078d5887da024dc68caa504bb2e278d5
164 Risk Score

Malware Insights

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

The PDF contains numerous links to compromised WordPress sites and disposable hosting, suggesting a link farm designed to distribute malicious files. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The presence of a 'download' button lure further supports this. No scripts were extracted, but the overall structure points to a malicious downloader.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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 http://www.festivalmarrakech.info/wp-content/plugins/formcraft/file-upload/server/content/files/1609e97601a13d---rinisadawagenefeze.pdf
    • http://someteme.com/archivos/_20210621030221.pdf
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/fcf48079b162b3b7bd7dab46ce547a7a/94631526669.pdf
    • http://ahs1966.net/clients/f/f9/f93f52488d971b5f2372adc2bdb16541/File/47732695764.pdf
    • https://southtours.com/wp-content/plugins/super-forms/uploads/php/files/01maurta6ivisfg575k3ihl2n0/34965695181.pdf
    • http://s8radziejowice-paszkow.pl/userfiles/file/bixarafokijapixuxubesil.pdf
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/ppcpl840g5c24adnibtgvvodqo/tuxokoper.pdf
    • http://www.tecnotrefg.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609df00b311eb---99519161451.pdf
    • http://studiopiergentili.it/userfiles/files/54609526809.pdf
    • http://ufnk.fr/app/webroot/files/file/lugogipajoras.pdf
    • http://dodogs.ru/sites/default/files/file/71716571860.pdf
    • http://tea-ra.com/user_data/upload/save_image/files/zulezosefeforisibozu.pdf
    • https://www.simcoerecovery.net/wp-content/plugins/super-forms/uploads/php/files/c1vpi6l943cuqvsdj6jbcnu82o/negedezobesiruse.pdf
    • https://leifs-auto.dk/images/file/12211208405.pdf
    • http://antifftech.com/uploadfile/file///2021073120164162.pdf
    • https://lynnesnaturaltreats.com.au/wp-content/plugins/super-forms/uploads/php/files/6182b9a569a844b412385f2ce671337d/84643363356.pdf
    • http://elektrostroy.kz/ckfinder/userfiles/files/dilozazowegagigexo.pdf
    • http://neodev.space/wp-content/plugins/formcraft/file-upload/server/content/files/1607e5a4362be3---vatimejulebosisupavetux.pdf
    • http://daearesort.com/FileData/ckfinder/files/20210613_DBAB6871D21963A3.pdf
    • http://thesnowmanicecream.com/ckfinder/userfiles/files/27354298000.pdf
    • https://associazionedynamica.it/uploads/file/zasonopoxuritedanex.pdf
    • https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/3b765ae526009cf070fed7cc2ad533c4/53473319633.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=b+tech+malayalam+full+movie+download+cinemavilla
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001019a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1019A 16792 bytes
font_01_sfnt_off000119ac.bin
35b9fbadaff57e32a192a7a9ec937856ebd2038c5b8bd0c2f60d9cb65cb5fd67
pdf-font-stream PDF embedded font (sfnt) at offset 0x119AC 17020 bytes
font_02_sfnt_off00014617.bin
1771d8c897166e6ccd168b1e35d56782970bfba8aa55e432115e28555dfd2b45
pdf-font-stream PDF embedded font (sfnt) at offset 0x14617 10892 bytes