Malicious PDF — malware analysis report

Static analysis result for SHA-256 e6156e27da7aa33e…

MALICIOUS

PDF

67.9 KB Created: 2021-09-21 23:57:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 89e8becc978290559159e1112f2fa3ab SHA-1: 7d3f6a946d9315349534cc963f05371701f507d7 SHA-256: e6156e27da7aa33e35ea9e47b98cea76adc95b7a1e0d99183a16ba129e7da787
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF is identified as a phishing lure due to its structure, containing minimal text and a single image, typical of a screenshot designed to hide clickable links. It contains numerous external URIs pointing to various domains, many of which appear to be compromised WordPress sites or disposable hosting, suggesting a link farm intended to redirect users to malicious content. The ClamAV detection and ML classifier further support its malicious nature, classifying it as a phishing trojan.

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 2 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://garglob.ru/uplcv?utm_term=ovitalmap+android+free+download PDF link annotation
    • http://fazendasaojudastadeu.net/fotosempresa/files/lidom.pdfIn PDF document text
    • http://mutamobilya.com/images_upload/files/52832467845.pdfIn PDF document text
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/1613e601001ddc---rikedusujagakasema.pdfIn PDF document text
    • http://oipipleszno.pl/userfiles/file/74082219449.pdfIn PDF document text
    • https://bohemiamaestro.com/webpagebuilder/ckfinder/userfiles/files/roxaguwinuba.pdfIn PDF document text
    • http://microcement.ua/userfiles/file/wezezejikurusepap.pdfIn PDF document text
    • http://jualumnitoronto.com/editor/uploadfiles/potiferufib.pdfIn PDF document text
    • http://saeronbio.com/userData/board/file/juresezat.pdfIn PDF document text
    • https://amityhr.com/userfiles/file/74662093133.pdfIn PDF document text
    • https://adikkedua.com/contents/files/11556771774.pdfIn PDF document text
    • http://laiyi-art.com/userfiles/file/9814172350.pdfIn PDF document text
    • http://gesundezellen.com/neu/userfiles/file/97642815751.pdfIn PDF document text
    • http://hoshitorionline.com/uploads/files/48446430359.pdfIn PDF document text
    • https://habibitours.net/ckfinder/userfiles/files/vulafotadepifir.pdfIn PDF document text
    • https://investkwik.com/userfiles/file/11371540356.pdfIn PDF document text
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143bde4c808c---papazofikuworuk.pdfIn PDF document text
    • https://eliteswimmingpoolsinc.com/wp-content/plugins/super-forms/uploads/php/files/iav55nucenbbng63af5t9h06u5/kusexej.pdfIn PDF document text
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614616f15e20a---riwegefowaj.pdfIn PDF document text
    • http://baruraprotidin.com/assets/ckfinder/core/connector/php/uploads/files/lasikizikito.pdfIn PDF document text
    • http://aesg2edcv.handylover.com/upload/files/juwomugami.pdfIn PDF document text
    • http://physio-praxismitte.de/userfiles/vogeb.pdfIn PDF document text
    • http://rdasesores.gestconcursal.com/editor/ckfinder/userfiles/files/65579614262.pdfIn PDF document text
    • http://gyermekhaz.hu/Content/site_images/files/37500237466.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_off0000aea7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAEA7 14116 bytes
SHA-256: 7183e4ad1d950818fccb505ac56c1147cdb5ed9b76773913e390009199b03cdf
font_01_sfnt_off0000d1d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1D7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e9ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9EE 10668 bytes
SHA-256: 9a5b38bd44318477e7e19a9758ec2b00bde57023e05da109fe08d10ae9fe3f86

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