Malicious PDF — malware analysis report

Static analysis result for SHA-256 7dfac1a644a7d4ef…

MALICIOUS

PDF

84.8 KB Created: 2021-09-19 16:15:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: e5496d959c59de41d6de7b6aebc2462c SHA-1: 0fb977167abdae676f3d11769591313c5b570ab0 SHA-256: 7dfac1a644a7d4efc2c11c0d21719cb61e9d78b97f63eb4a9c1f1a374deaa9d7
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs that function as a link farm, directing users to potentially compromised websites or disposable hosting. The presence of 'cmd' tokens in the document body suggests an attempt to execute commands, likely to facilitate the redirection or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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://coretry.ru/uplcv?utm_term=4x+faster+pro+apk PDF link annotation
    • http://safiorida.dk/operatori/userfiles/file/76095113122.pdfIn PDF document text
    • http://it-hair.com/userfiles/74704189214.pdfIn PDF document text
    • http://kokocurry.gm/userfiles/file/nisapawogen.pdfIn PDF document text
    • https://tresonance.org/uploadfiles/fafotumijijuwukapagenep.pdfIn PDF document text
    • http://langeline.com/ckeditor/upload/files/jozafigu.pdfIn PDF document text
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/161416514bceb9---wemigorufulaw.pdfIn PDF document text
    • http://greenbiotech.vn/uploads/userfiles/file/wibomunifulobenajiki.pdfIn PDF document text
    • http://dolonchem.com/upload/files/27268481650.pdfIn PDF document text
    • http://xn--80aap0abfiql8h.xn--p1ai/admin/ckfinder/userfiles/files/19010802938.pdfIn PDF document text
    • http://hublihorse.com/uploads/userfiles/files/46102582986.pdfIn PDF document text
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1613ead234ffe7---towurapufax.pdfIn PDF document text
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/29ichiqpg3osgc7tqmmcmdi04i/nujofekirivilewutizanuwi.pdfIn PDF document text
    • http://inlovehuahin.com/file_media/file_image/file/wisedixuxune.pdfIn PDF document text
    • https://vibangthuaphatlai.net/uploads/files/rokirososuduwupipuwajabil.pdfIn macro / runtime command snippet
    • http://xn----7sbabaajmdfbk3ddf3azka3b6a2r.xn--p1ai/ckfinder/userfiles/files/jimoti.pdfIn PDF document text
    • http://mentor-tutor.com/newGroserLikeProject/uploads/files/83459565093.pdfIn PDF document text
    • https://consurs.ro/ckfinder/userfiles/files/regorakeroginosalo.pdfIn PDF document text
    • https://gbagencement.fr/uploads/file/55157461614.pdfIn PDF document text
    • https://idealist.ro/userfiles/file/301273597.pdfIn PDF document text
    • http://marathon-gexin.com/Uploadfiles/files/vakilomigafarax.pdfIn PDF document text
    • http://servmed.net/userfiles/file/65521253824.pdfIn PDF document text
    • http://inlovehuahin.comIn macro / runtime command snippet
    • 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_off0000e3b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3B3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fbca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBCA 10284 bytes
SHA-256: 6f2ea0f421b064c5701c1ee9c934c79aa38cf5df54d26af7c8e32bb002e0aed2
font_02_sfnt_off00011321.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11321 19308 bytes
SHA-256: 823701ecdb545aa46a0b0d78759ae6e41c186b4c5dbddb75db421863fe8ce3cf

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