Malicious PDF — malware analysis report

Static analysis result for SHA-256 418222e10dc422bf…

MALICIOUS

PDF

75.2 KB Created: 2021-09-10 20:29:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 95e97718ce8ff29a8f7a585e67d032e4 SHA-1: 588a9c47cf581f1502de6937529df70137ba4cfd SHA-256: 418222e10dc422bfc3c83953f8b815751e5ecb79a57e15b3f16c199e366ef763
164 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to compromised CMS uploads or disposable hosting, suggesting a phishing or malware distribution attempt. The presence of a 'download button' heuristic further supports a lure-based attack. While no scripts were explicitly extracted, the ML classifier and ClamAV detection strongly indicate malicious intent, likely involving exploitation or the download of a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://smidgel.ru/uplcv?utm_term=spongebob+diner+dash+apk PDF link annotation
    • http://buddhavehicle.com/userfiles/file/46820701217.pdfIn PDF document text
    • http://pol2-simf.ru/userfiles/file/turaxifufalejukumu.pdfIn PDF document text
    • http://sunrui-ti.com/d/files/metesaropozukaxubelelirib.pdfIn PDF document text
    • http://cosyromania.com/media/file/nebawaxadimo.pdfIn PDF document text
    • https://misbahelmudii.org/ckfinder/userfiles/files/29724927104.pdfIn PDF document text
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138db5ac638a---gufebokikuvujolisofi.pdfIn PDF document text
    • http://slovoveri.org/userfiles/47146521751.pdfIn PDF document text
    • http://ilsogno-bomboniere.com/userfiles/files/19773049068.pdfIn PDF document text
    • http://zhfangyuan.com/uploadfiles/files/97461941540.pdfIn PDF document text
    • http://jd6618.com/jd6618/file/2021-9/file/LwpCms2021_09_10_08_38_49_3871.pdfIn PDF document text
    • http://lesbambousbleus.fr/ckeditor/upload/files/moxawejepafonokokatipejij.pdfIn PDF document text
    • https://xtrafitcoaching.com/www/images/files/wufekewafukotawajalunoxip.pdfIn PDF document text
    • https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/jmv04pui7nbgde149l256r1vdu/bujafatufurotinunosimatit.pdfIn PDF document text
    • https://kingdomdatesuae.com/userfiles/files/92323639900.pdfIn PDF document text
    • http://yaqeen-eg.com/userfiles/file/9587328923.pdfIn PDF document text
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161300943e1f8e---mefafeperadubivasom.pdfIn PDF document text
    • http://diversecityuk.com/userfiles/file/gulusuposo.pdfIn PDF document text
    • http://nato-denkmal.de/uploads/file/75536438015.pdfIn PDF document text
    • http://chinalanpa.com/images/upload/File/38530884452.pdfIn PDF document text
    • http://innobiztour.com/FileData/ckfinder/files/20210901_B9FD787677DDDA2B.pdfIn PDF document text
    • http://climtech.com/files/files/linoxosugifurumax.pdfIn PDF document text
    • http://ky-auto.com/uploadfile/files/19941915645.pdfIn PDF document text
    • 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_off0000bf18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF18 17876 bytes
SHA-256: 284d79ed6f3d815805f8b95e25664225f29aab8e81ecb78b0053abde32b069e3
font_01_sfnt_off0000ee55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE55 10836 bytes
SHA-256: f5cbbf28f6c16a60ee4b34525de85e7d2a27120ddecc8b9bb4fa01140aeb6800
font_02_sfnt_off000106ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106CE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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