Malicious PDF — malware analysis report

Static analysis result for SHA-256 d56273f415bcfa9b…

MALICIOUS

PDF

67.6 KB Created: 2021-09-30 18:53:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 2bf428540fcb58e605d894c75789d61d SHA-1: 2e8f4f901a0fb1377cfbd90f101164b5db1e8b23 SHA-256: d56273f415bcfa9bb3b8ca610f025272f6ca16e061b95f04ea2b66765265b2ab
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF is identified as an image-only lure, a common phishing technique to trick users into clicking on embedded links. Numerous external URLs were extracted, many hosted on compromised WordPress sites or disposable domains, suggesting a campaign to distribute malicious content or redirect to phishing sites. The ClamAV detection and ML classifier strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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
  • 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 67 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://allytemp.ru/uplcv?utm_term=sanam+re+movie+watch+online PDF link annotation
    • http://usefchina.com/uploadfile/file///2021091700553969.pdfIn PDF document text
    • https://gulceoyunlar.com/calisma2/files/uploads/40479946965.pdfIn PDF document text
    • http://ahnil.com/userData/board/file/78915631725.pdfIn PDF document text
    • https://driftwoodcc.com/userfiles/files/dunajulafasujuwowi.pdfIn PDF document text
    • http://timecraftz.com/userfiles/file/14419466969.pdfIn PDF document text
    • http://guchen.ru/d/files/wiliv.pdfIn PDF document text
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/9b128fc00a16f088927d01ce46ac13ed/81292494424.pdfIn PDF document text
    • https://konchris.com/userfiles/file/1631974485.pdfIn PDF document text
    • http://dogomanhnghia.com/uploads/files/2548587045.pdfIn PDF document text
    • http://holmeslawfirm-iowa.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/wofanezerosanadol.pdfIn PDF document text
    • https://stotex.rs/files/vibazuligekaxigepenubo.pdfIn PDF document text
    • http://profitoolinfo.ru/ckfinder/userfiles/files/28915424838.pdfIn PDF document text
    • https://athensviptour.com/wp-content/plugins/super-forms/uploads/php/files/11b3cdaa37e832660da2b6705baef806/ropofudukige.pdfIn PDF document text
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16155b3bc6cbd6---29053319811.pdfIn PDF document text
    • http://www.laterveer-biesenbeek.nl/ckfinder/userfiles/files/maduranexowuni.pdfIn PDF document text
    • http://thebankcardservice.com/uploads/files/terupetapunimobuga.pdfIn PDF document text
    • http://xn--b1agjlwjc3g.xn--p1ai/ckfinder/userfiles/files/70918572163.pdfIn PDF document text
    • http://dentherapia.hu/files/file/paguwodezet.pdfIn PDF document text
    • http://hophungvietnam.com/app/webroot/uploads/files/vifaluxajelezus.pdfIn PDF document text
    • http://amidoux-peintures.com/ckfinder/userfiles/files/jidefi.pdfIn PDF document text
    • http://bright-inter.com/file_media/file_image/file/20832285989.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16146357648ad7---13795310348.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_off0000ad2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAD2E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c540.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC540 14468 bytes
SHA-256: fae41e2d36824cf91c49e97d15f17b7ef266fadb9473f1f0483e756132e04440
font_02_sfnt_off0000e94d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE94D 10556 bytes
SHA-256: 944e7ef80a9b5877e7cacbb34bb46f77332d30e97a47a1c9e73a682390d24265

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