Malicious PDF — malware analysis report

Static analysis result for SHA-256 83fc092798652238…

MALICIOUS

PDF

87.9 KB Created: 2021-07-09 02:06:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 76a7667e2a7e922057b06728f9e2b87d SHA-1: e6446e958de1e6dbceac4ec05a55ee4d21989a64 SHA-256: 83fc0927986522383f6a7e2f2def76033ecc8035a2293e203bedd6850db2135e
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as 'Pdf.Phishing.Trojan' and an ML classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm pointing to compromised WordPress upload storage and disposable hosting, suggesting an attempt to redirect users to malicious content. The embedded URLs, while some are marked benign, are part of a larger pattern of suspicious link distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 6

  • 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.
  • 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://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/e06f2440181df2d426e761cd402e5d34/33697149028.pdf In PDF document text
    • https://broadstripe.com/wp-content/plugins/super-forms/uploads/php/files/6c4f9a5776766f64a6196b9b3656ee43/lexoluxiximope.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/0c97d0ddc2c306c568eb99139f537733/zugitupegunef.pdfIn PDF document text
    • https://vansuloi.com/uploads/userfiles/file/muralidijajivodumolo.pdfIn PDF document text
    • https://oglethorpeclub.org/~oglethor/UserFiles/file/josikam.pdfIn PDF document text
    • http://franzoesischebulldoggen.eu/userfiles/file/meverafubuwugivir.pdfIn PDF document text
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dfdda49f2d3---20122938347.pdfIn PDF document text
    • http://bularz-auto.pl/images/userfiles/file/razubabiwob.pdfIn PDF document text
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/1607e64f65b4a6---73672733679.pdfIn PDF document text
    • https://tort-art.ru/userfiles/file/tudig.pdfIn PDF document text
    • https://aymfly.com/aym_image/files/tikipokoperixorajutemare.pdfIn PDF document text
    • https://premiumvipbusiness.com/wp-content/plugins/super-forms/uploads/php/files/4564d14e17340e2c9afe28b28ebceb8f/motiwuximu.pdfIn PDF document text
    • http://noithatlekhanh.com/Images_upload/files/45578066587.pdfIn PDF document text
    • http://3q1p.com/upload/file/2106180622572676275c28aol175d6.pdfIn PDF document text
    • http://adabaskimerkezi.com/upload/file/vizotuditupoxuduzinajanof.pdfIn PDF document text
    • https://soudurelauziere.com/upload/editor/file/malixufisuporazimegodo.pdfIn PDF document text
    • https://dobre-akce.cz/media/files/file/56597700950.pdfIn PDF document text
    • https://gilbertems.com/videos/file/2759668283.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/63234d61b435eb7b143bafd77a5e7b82/28113427773.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160dbce04d92a0---namolujadun.pdfIn PDF document text
    • http://dentish.ru/ckfinder/userfiles/files/lixededugamogib.pdfIn PDF document text
    • https://sancarspune.com/wp-content/plugins/super-forms/uploads/php/files/eacc2e5546e5a6f7c9940b12f063be96/nunoborokaki.pdfIn PDF document text
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3bbb29bf98---65071912789.pdfIn PDF document text
    • https://foxtailmag.net/wp-content/plugins/super-forms/uploads/php/files/c5d0a5c3e4c7103ed96dd1e7a7c39ed6/19402165257.pdfIn PDF document text
    • http://surtek.biz/image/files/20150131_090551.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=signs+you+have+pcosPDF 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_off0000f705.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF705 16452 bytes
SHA-256: 1d751ebf82bc71e92e8a756896855dacd86cbe4485d1b64cab8f4be66d097312
font_01_sfnt_off000121db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121DB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000139f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139F2 10764 bytes
SHA-256: 34accdcd3bcdafea55e1a21e6bac1ae7e530f185a34e50dfdd5fc94cf25212f4