Malicious PDF — malware analysis report

Static analysis result for SHA-256 14dc136ff663aa6e…

MALICIOUS

PDF

86.9 KB Created: 2021-07-04 09:21:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 58c94d0e3cb616061a9185d1f76b1270 SHA-1: 2bf3888e2f3df13ff467b2a65492762f8b482b88 SHA-256: 14dc136ff663aa6e77687990550c1348b9b046dfd17f06053c8095609c6977cf
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links pointing to potentially compromised websites, suggesting a phishing or malware distribution scheme. The PDF structure itself is identified as a link farm on disposable hosting, further supporting its role as a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://mkting.com.co/wp-content/plugins/super-forms/uploads/php/files/3bc2bf1c59098cdd20c50453546d1625/japibuj.pdf In PDF document text
    • http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/e9f540c4e20d2383206b58825d87c6d6/43711278909.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609ba8c6e2284---gulozoderejoguzuboza.pdfIn PDF document text
    • https://www.perfumista.co.uk/wp-content/plugins/super-forms/uploads/php/files/b46f5840237dad3640d0f095def4956d/67659769154.pdfIn PDF document text
    • http://szpk.hu/_user/file/bimixixomidumomoj.pdfIn PDF document text
    • http://studio5r.com/userfiles/files/vejobujuwa.pdfIn PDF document text
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/160cb77cb35940---petisubele.pdfIn PDF document text
    • http://alphabodysupplements.com/newerac2c/userfiles/file/rekerojagapudeketuba.pdfIn PDF document text
    • http://microcement.ua/userfiles/file/55051662472.pdfIn PDF document text
    • http://ahcxdq.com/uploads/file/11044941670.pdfIn PDF document text
    • http://smit-electronic.hr/upload/datoteke/20126642338.pdfIn PDF document text
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606cbcf406c4b---sufizeliw.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606d6c47a4fa0---28781403682.pdfIn PDF document text
    • http://lbs.ac.at/wp-content/plugins/super-forms/uploads/php/files/rfboeajhsjiomie0oi4hv3a6ub/57114148552.pdfIn PDF document text
    • https://mytekas.com/UserFiles/file/kowenu.pdfIn PDF document text
    • http://clinicacomciencia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a982a97af2e---mogefijonazomu.pdfIn PDF document text
    • https://rzfmuhasebe.com/userfiles/file/87994734472.pdfIn PDF document text
    • http://hobbstownis100.com/clients/6/66/66141d04a4341350d76ae3a38785cb5a/File/89065360500.pdfIn PDF document text
    • http://gat-asset.com/CKEdit/upload/files/61417921668.pdfIn PDF document text
    • https://atlanthealth.com/wp-content/plugins/super-forms/uploads/php/files/4c4055322f10a8733d05e67c3cbaadaa/nezibib.pdfIn PDF document text
    • http://backkwang.com/userData/board/file/18984503957.pdfIn PDF document text
    • http://avision-italia.com/userfiles/files/68552215473.pdfIn PDF document text
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8fb0e652f2---tofumepewetabela.pdfIn PDF document text
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/0d197f2a40c85482af219ffb6390625d/lowedoguxazepesogariwapaj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=rs+aggarwal+mathematics+for+class+7+solutionsPDF 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_off0000ef54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF54 11064 bytes
SHA-256: e7e6f8c3d7b4ffd8c5c0d588f2f1bda24e9047239ba6277cd64e1f48b52441c3
font_01_sfnt_off0001090c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1090C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001211e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1211E 17268 bytes
SHA-256: cd079886bd25835d05470fdbfb5f62f73f1983d9039a97303516075c56c23dee

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