Malicious PDF — malware analysis report

Static analysis result for SHA-256 f08e0382b11b72ab…

MALICIOUS

PDF

80.7 KB Created: 2021-09-16 11:01:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 82396a5e10427345540b4a235d9467fa SHA-1: f02f16e81ae46bd90f59218273d88a19c8da348c SHA-256: f08e0382b11b72ab00f2e9c79a89c3cff37f3a5d7a1f4aa3c1db8b63c4749e13
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are hosted on compromised or disposable domains, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The embedded JavaScript likely facilitates the redirection or further malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://mps-india.com/userfiles/files/dugemow.pdf In PDF document text
    • http://elijasprojekts.lv/files/file/45401930909.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136cda030fee---68284900135.pdfIn PDF document text
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/2ac51cee2467cf6d33429aa7034ed3f6/memejena.pdfIn PDF document text
    • http://c-six.it/userfiles/files/38072443356.pdfIn PDF document text
    • https://srilangkapools.com/contents/files/36966351644.pdfIn PDF document text
    • http://ohadalegistrocbarter.com/ckeditor/uploads/files/vorujadupuxav.pdfIn PDF document text
    • http://plusk-car.com/js/upload/files/vusivawos.pdfIn PDF document text
    • https://cukimentescukraszda.hu/files/files/kidadurazejex.pdfIn PDF document text
    • http://55pluscommunityspecialist.com/userfiles/files/petesonavoderulomigunax.pdfIn PDF document text
    • http://nakajima-ya.com/upload/save_image/files/zirebubevesixo.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/70822065926.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/35092893617.pdfIn PDF document text
    • http://nguyenthaotech.com/upload/files/dapurufepagoxineloki.pdfIn PDF document text
    • https://swaarm.de/app/webroot/upload/files/rajogejemabukitapoxukewej.pdfIn PDF document text
    • http://vxclouds.com/userfiles/file/42522742947.pdfIn PDF document text
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137f75363a5b---43431351941.pdfIn PDF document text
    • http://scamps.biz/userfiles/file/57424115095.pdfIn PDF document text
    • http://hanasushipickup.com/uploads/files/35229161608.pdfIn PDF document text
    • http://abyss.sk/userfiles/file/99867971163.pdfIn PDF document text
    • http://aolisenjiancai.com/data/files/42855213223.pdfIn PDF document text
    • http://xsteelstock.com/d/files/bawuziluxubebetamaveme.pdfIn PDF document text
    • http://abwnickersonplaza.com/uploads/files/20771683992.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=dragon+quest+monster+androidPDF 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_off0000c7b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7B2 23816 bytes
SHA-256: e38556171f21fd217d08baf16c40c5f5f6d34a138dc9f7ec11373625449b76da
font_01_sfnt_off0001047f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1047F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011c96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C96 10792 bytes
SHA-256: 4343fe1a70fd560356286bc71e7278fa2e15eab7fd6b068a0ce3ba31c406530b