Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae49fc8f3c5d584c…

MALICIOUS

PDF

92.4 KB Created: 2021-08-02 09:06:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1f906755d5055ac48c43bb601011c7b8 SHA-1: 37c8136d96e2d1373b29d0d4f76aa505ee2f96de SHA-256: ae49fc8f3c5d584c060822fcefc02b0258e2935ea25897483a7469a2d4f02292
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to compromised or disposable hosting, indicating a link farm designed to lead users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. No scripts were extracted, and the document body was unreadable, so the attack pattern is inferred from the URL structure and heuristic firings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://mides.vn/images/ckeditor/files/30931061532.pdf
    • https://aneri12.eu/res/file/gimevi.pdf
    • http://stylist.in.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160729c1d74255---dudefumukogabe.pdf
    • https://prawobrzeze.info/userfiles/file/45677411903.pdf
    • https://www.straightmyteeth.com/wp-content/plugins/super-forms/uploads/php/files/ee221c16d6860837eae9c014fc6f0070/23658748162.pdf
    • http://thuephotocopytaihanoi.com/upload/files/51304756733.pdf
    • http://arci-mp.fr/admin/File/92788456352.pdf
    • https://blueridgelightingandcontrols.com/wp-content/plugins/super-forms/uploads/php/files/1e30073f98d61f5cb64102331c24334b/19084088574.pdf
    • http://www.sealjet.mn/pictures/files/sozenuwipoxedoxanej.pdf
    • http://mstreatmentadvances.com/userfiles/files/nebokopexexaxeg.pdf
    • http://drivescuolaguida.it/userfiles/files/jowopixoz.pdf
    • https://shopabrang.com/images/files/75907292632.pdf
    • http://soflocops.com/clients/67403/File/47860039795.pdf
    • https://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/9cc66a519056abc1ebb67047b5edb7f1/69866137089.pdf
    • http://aldo-ins.com/userfiles/file/sopogugamebukul.pdf
    • http://10glazsikeyrosa.ru/file/guxafiwabosuvegowejimo.pdf
    • http://feg.vn/uploads/files/kurekuvijawisitipibiro.pdf
    • http://mtecommerce.it/public/news/file/kitoxawimugudaduwalug.pdf
    • https://betenagro.com/sites/default/files/file/zunokasif.pdf
    • http://vstarmp.cn/upload/files/20210801_180152.pdf
    • https://bangprice.combangprice.com/beta/cms_image/file/95065918602.pdf
    • http://dietetyka-24.pl/images/files/buputafo.pdf
    • https://prastosten.se/anvandarbilder/95/files/lepim.pdf
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac407dd8ac7---wudoguto.pdf
    • https://masterpieces-mallorca.com/wp-content/plugins/super-forms/uploads/php/files/cc5f5211e0ac792b1d6b1cd40e7ba3ce/80826141821.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=zulubet+weekend+prediction+mathematically
    • 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_off000103d3.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x103D3 16792 bytes
font_01_sfnt_off00011be5.bin
4d9e42de190eb534c9d97205b412b1b3c0807ddc3e519816e2026997fa1f0593
pdf-font-stream PDF embedded font (sfnt) at offset 0x11BE5 17700 bytes
font_02_sfnt_off00014a3b.bin
2274b457c9cc297197ea86a83ecf62e6e527e05d696345eb79ec5e3a33604dc9
pdf-font-stream PDF embedded font (sfnt) at offset 0x14A3B 11104 bytes