Malicious PDF — malware analysis report

Static analysis result for SHA-256 453a0bccf9717d6c…

MALICIOUS

PDF

93.4 KB Created: 2021-06-29 16:52:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 982ae4d4b86741ad40509bd51040e212 SHA-1: bd2c43ba31f2ebcdd4d07a823945f03e9d65cfbd SHA-256: 453a0bccf9717d6c6ed25a45bc4e57027fb8049b39f22fdf7e6dc29333cf13cf
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple external websites, some hosted on compromised CMS platforms. The presence of numerous URLs, many pointing to PDF files within form upload directories, suggests an attempt to distribute malicious content or redirect users to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9927

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 http://orgue-chantepie.info/FCKeditor/upload/file/nusorevomodo.pdf
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/160825f5db8211---75431673587.pdf
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160d4e25104b2a---99416900081.pdf
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/16072d3b81978c---86458980371.pdf
    • http://brenno-tojestto.pl/userfiles/file/34062501712.pdf
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bbf0bf23614---44134728122.pdf
    • https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/cbdf4adbab6bdfea4a95203ea731067e/fowarowuzebivazifidewan.pdf
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b449349e03f---3462294541.pdf
    • https://bangprice.combangprice.com/beta/cms_image/file/27085406538.pdf
    • http://theettiaresottawa.ca/clients/e/e8/e8f54e69a7463df9fd0adff13cd8e90f/File/lukokefufoximumerisakexo.pdf
    • https://www.femregenx.co.za/wp-content/plugins/super-forms/uploads/php/files/46uh5m7855oai9g584673bf6k6/figege.pdf
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/2b95d374eee5ebb7ee79495ad5dbe9a7/bujewetelifaboladunesi.pdf
    • https://danielstrehlau.com/userfiles/file/63586942390.pdf
    • http://intestinalfortitude.org/clients/0/0c/0cf504f131cb0201443a7bd449519f4a/File/62764323882.pdf
    • http://www.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607df2b2a87cd---92651361223.pdf
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/cd454m425l8k13gblsof2u04g1/62993176432.pdf
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076d7cda41ca---wopewow.pdf
    • http://svaz-podnikani.cz/files/file/55139462750.pdf
    • https://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/a36ac0eabb04b5e67818aab0496aad2a/8044043140.pdf
    • https://www.scilights.com/wp-content/plugins/super-forms/uploads/php/files/b7814adf0967a4f50148f550a18d29a3/zusaruxud.pdf
    • http://qkmedica.com/uploads/userfiles/file/86592767326.pdf
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/pt8jbj920hl9i4l4nb0098a1kt/58198515344.pdf
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/16092290569383---72040342902.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=describe+squamous+cell+carcinoma
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f4b0.bin
98bcec2be85b547d266a48c61dccc50816b624367bf69e2f194f2b8087d010f5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF4B0 16092 bytes
font_01_sfnt_off000109f1.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x109F1 16792 bytes
font_02_sfnt_off00012203.bin
0cffa0ff0674b69f003c2cdf5eb90eca39cc0aaadb361f714c8ed8063bfb07de		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12203 17236 bytes
font_03_sfnt_off00014f51.bin
8dd5ef3a9e440c222fe6434485df90394fb8b9f3d1574ebc7c70a038b8473c41		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14F51 10680 bytes

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