Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d8cec49f4f2f2fc…

MALICIOUS

PDF

88.6 KB Created: 2021-07-31 19:54:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 19522c07d1119b029fd6beca8b5b8340 SHA-1: 119c79a82526ec1c51693690d152b97a4349768b SHA-256: 4d8cec49f4f2f2fc9fd4f547fa93e095c442036cf59fdc090b38357c6b8aea4f
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous links, many pointing to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users to potentially harmful content. The document body is unreadable, but the heuristic firings strongly suggest a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160717bf192c75---xulup.pdf In PDF document text
    • https://xn--z4qq44i.tw/upload/actfiles/94314686899.pdfIn PDF document text
    • http://etnorom.hu/pictures/luzegutiri.pdfIn PDF document text
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d3ff9a281e---6103899926.pdfIn PDF document text
    • https://travelinnsuites.com/nbloom/fckuploads/file/bados.pdfIn PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160858fe8e3552---lutigobiluvadajonomojodup.pdfIn PDF document text
    • http://saamfactory.com/wp-content/plugins/super-forms/uploads/php/files/1c776316fbf12084e4b824ac2c5225f0/32287583524.pdfIn PDF document text
    • http://lamdecal.com/Images_upload/files/62322049901.pdfIn PDF document text
    • https://www.mixedclass.com.au/wp-content/plugins/super-forms/uploads/php/files/cjihnite7bbupnelv0jflfrrnq/kuraputotelikajebinased.pdfIn PDF document text
    • https://vestol.bg/files/file/tesavutotagupokedu.pdfIn PDF document text
    • https://rosycaffe.com/file/75197479871.pdfIn PDF document text
    • http://www.stallionreadymix.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160827a7054992---zaxakodoguzexogur.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/41686341749.pdfIn PDF document text
    • https://keluargamimpi2.com/contents//files/71320622260.pdfIn PDF document text
    • https://agentcctv.com/userfiles/file/89887619158.pdfIn PDF document text
    • https://grand-forge.ru/wp-content/plugins/super-forms/uploads/php/files/6fd0ac75f9f0ed58cf76b4c19504c64d/sososebitoj.pdfIn PDF document text
    • http://brette-animation.com/userfiles/file/10320034815.pdfIn PDF document text
    • http://christembassydocklands.org/wp-content/plugins/super-forms/uploads/php/files/1cfba8a1279c4206c42a4f57f614b434/51913411011.pdfIn PDF document text
    • http://mynigaoe.com/upload/file/20210623004633.pdfIn PDF document text
    • https://kantankacreative.com/wp-content/plugins/super-forms/uploads/php/files/f5dcb4728122fa97ddeb7c19b7f01676/warog.pdfIn PDF document text
    • http://shmountaineering.co.uk/wp-content/plugins/super-forms/uploads/php/files/egsv2243d101g9v33qlgcv6153/pugorexugutuxubusenejotir.pdfIn PDF document text
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160863e4d1e9de---tetoxupo.pdfIn PDF document text
    • http://afslab.asia/upload/files/kanojodew.pdfIn PDF document text
    • http://amoy-art.com/Upload/file/16378294413.pdfIn PDF document text
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af6a1d24366---26534117803.pdfIn PDF document text
    • http://z-i-f.ru/userfiles/file/dusivevetidotafofif.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=moises+y+los+diez+mandamientos+capitulo+180+optimovisionPDF 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_off0000ef2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF2B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010742.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10742 11292 bytes
SHA-256: fe94cd00366836338de456c8737e2033315df6b2f20da8bcac603b1d49915a08
font_02_sfnt_off000121e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121E9 19248 bytes
SHA-256: fdeff9f47c0845996bae51b2ff9e58ea13f4e11de1419e3af3a3cb3bc00dd7c2

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