Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ce3fceee00eaaa0…

MALICIOUS

PDF

91.0 KB Created: 2021-08-07 15:09:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 55791b18699843f05f6d7e46b23eb7b3 SHA-1: 921b471ece6e5ee59548748dc42bedc3754c89c7 SHA-256: 5ce3fceee00eaaa05c3e81acb870821215e8b13f81853833bfc2e4184347ac60
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous URLs pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to redirect users to malicious content or phishing sites. While no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9876

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://vdadanang.vn/app/webroot/assets/files/10774532038.pdf In PDF document text
    • https://jahanchart.ir/data/files/file/77888956641.pdfIn PDF document text
    • http://ipjanah.ir/wp-content/plugins/super-forms/uploads/php/files/pm0rpmeoslgpua460d54c63770/lapedemu.pdfIn PDF document text
    • http://hanhthien.net/uploads/file/pofibobovajinokot.pdfIn PDF document text
    • https://www.adilaltinsoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608395b6b5fb1---86708738181.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/f429f295499a0e7aca2b44632a617505/jatij.pdfIn PDF document text
    • http://matsusushionline.com/uploads/files/pobozasimopav.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b632748a778---65825199084.pdfIn PDF document text
    • http://cabinet-blin.fr/ressource/site-image/files/luvubifivabibut.pdfIn PDF document text
    • http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bdd24b24b56---witonepinejaxi.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608042d29438a---nuregimomakurewudixej.pdfIn PDF document text
    • http://poetryforthespirit.com/clients/872464/File/jekajuri.pdfIn PDF document text
    • http://minhphucvietnam.com/uploads/userfiles/file/70952115528.pdfIn PDF document text
    • https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/11d897c108d6f2d7e5bc77d6b525c555/85795834143.pdfIn PDF document text
    • http://akademia-jedenastka.pl/zdjecia/fck/file/83942653034.pdfIn PDF document text
    • http://tarnava.eu/user_images/file/fojirulunigefo.pdfIn PDF document text
    • https://seroinstitute.com/wp-content/plugins/super-forms/uploads/php/files/883edbcc0421bf9da70f21788d653a17/73967984456.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160beaef408de4---fubamakakebakira.pdfIn PDF document text
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160754f3d4ffc2---kodoxiriguxekilulino.pdfIn PDF document text
    • https://abhimaninteriors.com/ckfinder/userfiles/files/jototabopono.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160867df1ecbb2---midosokuvatir.pdfIn PDF document text
    • http://terminsk.by/pics/files/zejibuvawovomonalejoxu.pdfIn PDF document text
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c73788a8e99---mivavilutifutogadebasoki.pdfIn PDF document text
    • http://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e2e7e0d221---68964586367.pdfIn PDF document text
    • http://centralcogtc.com/uploads/file/xurewarobetavozixutofe.pdfIn PDF document text
    • https://www.hotelamoha.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a9f0c4cb01f---rudomagepulozomafavewexe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=four+similarities+between+dna+and+rnaPDF 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_off0000fec9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEC9 10712 bytes
SHA-256: 7dec0d1a55329980ac5c5d9277992e0dcdb4b96f2ef7aef383d0c3665d8764d5
font_01_sfnt_off00011769.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11769 16856 bytes
SHA-256: 00895404f4cb8c13951c9966cab3d69df5aeaaa45c92014d036131fd08e588ee
font_02_sfnt_off00014319.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14319 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1