Malicious PDF — malware analysis report

Static analysis result for SHA-256 3807bb9a5817367b…

MALICIOUS

PDF

75.0 KB Created: 2021-09-17 22:10:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: eeb36db203e68bbb36c74bf675ae2c32 SHA-1: a83711573161e00beefb564317e9791befb5099c SHA-256: 3807bb9a5817367bcda07a427e4c9cc0e38b9fe2e404e82a9aa5f8af999fb1b4
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF is identified as a phishing lure due to its small size and image-based content, typical of a screenshot designed to trick users into clicking embedded links. Multiple heuristics indicate the document contains a link farm pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to distribute malicious content or redirect users to phishing sites. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9919

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 74 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 http://orgue-chantepie.info/FCKeditor/upload/file/95371464182.pdf In PDF document text
    • https://ntiverification.com/userfiles/file/54946679519.pdfIn PDF document text
    • http://csa.china-led.net/static/editor/ckeditor/ckfinder/upfile/files/20990127349.pdfIn PDF document text
    • https://brihat-group.com/assets/userfiles/files/11770963887.pdfIn PDF document text
    • http://limeitec.com/upfiles/editor/files/jidivopigugakividibiru.pdfIn PDF document text
    • http://bk-plus.at/userfiles/files/xupesavikop.pdfIn PDF document text
    • http://abwmechanicsville.com/uploads/files/60851786290.pdfIn PDF document text
    • http://123podkrovie.sk/editor_uploads/files/29846750891.pdfIn PDF document text
    • http://waycreon.net/bhaskar/yii/upload/files/71427496816.pdfIn PDF document text
    • http://pincailight.com/zk/UploadFile/file/2021090507480173499.pdfIn PDF document text
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/161345081d71ed---dijoma.pdfIn PDF document text
    • http://ocean-ex.com/images/blog/file/mibasodorisupogowazanosen.pdfIn PDF document text
    • http://zzzwchem.com/upload/files/zozevelibenuxerodom.pdfIn PDF document text
    • http://hamishehbaharcarpet.com/My_Project/Hamishe_bahar/ahar_img/files/24326042410.pdfIn PDF document text
    • http://sushiloverca.com/uploads/files/bomizawojiduvasilanelex.pdfIn PDF document text
    • https://technok.cz/wp-content/plugins/super-forms/uploads/php/files/54cb32903d1db3ead3b362353654368a/975010352.pdfIn PDF document text
    • https://lifecareproduct.in/ckfinder/userfiles/files/51302807577.pdfIn PDF document text
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/161358a1756bcd---20802816640.pdfIn PDF document text
    • https://ehotelgateway.com/bot/ckfinder/uf/files/vebidukidamotirunej.pdfIn PDF document text
    • https://www.baileysmilk.com/wp-content/plugins/super-forms/uploads/php/files/76852f1e2dd3a70cd83542ebba0530d6/povojiga.pdfIn PDF document text
    • https://marathonlaval.com/userfiles/files/gogal.pdfIn PDF document text
    • http://satisfytech.com/ck/upload/files/zejikatunezis.pdfIn PDF document text
    • http://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613139d0d99db---jalatotexixe.pdfIn PDF document text
    • https://mithermomix.com.mx/wp-content/plugins/super-forms/uploads/php/files/45833529dcb81572407ef727939e2d3c/puzafipinejepivifixixul.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=private+account+following+viewerPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off0000eaee.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xEAEE 17628 bytes
SHA-256: b7da12d9373bc114cd8098d0646e25f542fcb26ddf522b45f79336549f16a253
font_00_sfnt_off0000b0e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0E2 13832 bytes
SHA-256: d790b980ca192113d5afbac051d9efa3b8643d32801f894f2a242ff2eb38a256
font_01_sfnt_off0000d2dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2DD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off0001058d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1058D 10596 bytes
SHA-256: 7c8c45ece9ced5aa0864a524460c3dc5d51f7048b9a01d1b733329690b9acc58