Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e1b89b37b3d70a8…

MALICIOUS

PDF

68.3 KB Created: 2021-10-01 17:54:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 62dfc78233bf003dad4d5509b066d50a SHA-1: 5e00bbe4b52f4e8b17b353b239f1a9c203ff7df4 SHA-256: 4e1b89b37b3d70a826108e5d25b9f0b0e864eb050a9f8f83bb1f50e5b1a85db9
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document is identified as malicious by ClamAV and ML classifiers, exhibiting characteristics of a phishing lure. It contains a high density of external links, many pointing to compromised CMS upload directories and disposable hosting, suggesting an attempt to redirect users to malicious sites. The document's structure, being image-heavy with minimal text, further supports its use as a deceptive lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

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
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 68 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://medvor.ru/uplcv?utm_term=ps4+controller+android+remote+play PDF link annotation
    • https://khabul.mn/mmpa/userfiles/files/49450042069.pdfIn PDF document text
    • http://nikkenj.com/userfiles/file/kabofexadijes.pdfIn PDF document text
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/161538970dfddb---penexorunisuv.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ede9bee2ae---japasinibafigan.pdfIn PDF document text
    • http://airsoft1.ro/files/file/nugetipolimavex.pdfIn PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/161365c071ed96---rebovixojigadifa.pdfIn PDF document text
    • http://sdhmladavozice.cz/userfiles/file/84256317249.pdfIn PDF document text
    • https://rajatotogroup4.com/contents/files/mubas.pdfIn PDF document text
    • http://hbinpol.cz/media/images/upload/file/11956977818.pdfIn PDF document text
    • http://colegiosantarosa.com/uploads/imagem/file/wiminusugenusodadegasiga.pdfIn PDF document text
    • http://budgettranslation.hu/sites/default/files/file/judiv.pdfIn PDF document text
    • http://chekeeh.ir/basefile/chekeehir/files/79993890703.pdfIn PDF document text
    • https://peptidturkiye.com/ckfinder/userfiles/files/38789477450.pdfIn PDF document text
    • http://mackits.eu/image/lefupixexoletagupi.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/wixadilabitanisinuku.pdfIn PDF document text
    • http://sweatrinserepeat.com/ckfinder/userfiles/files/legekuvozuvodisadojif.pdfIn PDF document text
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161408f0e0cb01---xagodupuketisedotaresovun.pdfIn PDF document text
    • https://zhansq.cn/upload/file/82821211933.pdfIn PDF document text
    • http://refpecsbelvaros.hu/kepek/files/12445767755.pdfIn PDF document text
    • http://abwclayton.com/uploads/files/ziruliv.pdfIn PDF document text
    • http://obedovice.cz/userfiles/file/zazozasozisupugufonozuxu.pdfIn PDF document text
    • https://istanajp2.com/contents/files/35632999205.pdfIn PDF document text
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/161495bfe549a0---tinawudidejutazokijoruj.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_off0000af6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF6A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c77c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC77C 14108 bytes
SHA-256: 0ac3eb60a97d0083c261b2233c800ea8ed83ad958b102f1c646139bbaf21baea
font_02_sfnt_off0000ea79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA79 10868 bytes
SHA-256: 5d0cdfe7ef1a4f23f03712624217b8ae5df1e28967d1bb34c53a1f62b67008b2

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