Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc6a87de2531b111…

MALICIOUS

PDF

67.6 KB Created: 2021-09-26 06:37:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 83651990b4fbc8e5e0744f249662b15c SHA-1: b8e44841491b86154dfe86db44971afe8c21f51b SHA-256: bc6a87de2531b111b82688ec1e301907df19ebbbc8426385f596d7fbf6e76890
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, image-heavy content, and embedded clickable links. The heuristics indicate it's designed to trick users into visiting external URLs, likely for phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and link farm characteristics strongly suggest malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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 http://xn--80ab1a9a.xn--p1ai/sadm_files/buluzexawavugofitigulif.pdf In PDF document text
    • https://managedentalclinic.com/ckfinder/userfiles/files/76861207849.pdfIn PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1612f7a94dcc7e---15022461957.pdfIn PDF document text
    • http://srihemkuntsahibfgp.org/hemkunt/userfiles/file/lobiputedewel.pdfIn PDF document text
    • http://jingmingtai.com/filespath/files/20210911231343.pdfIn PDF document text
    • https://millinerandassoc.com/files/file/xifedewigujideliro.pdfIn PDF document text
    • http://xedaptap.net/userfiles/file/43522884704.pdfIn PDF document text
    • https://lawyerupsmart.com/tempimg/file/zumizo.pdfIn PDF document text
    • http://splhardware.com/UploadFile/file/2021091221125573499.pdfIn PDF document text
    • https://ewastexperts.com/userfiles/files/57428108853.pdfIn PDF document text
    • http://ilkconstruction.com/Images/Media/files/novibonajekeduzatowirofa.pdfIn PDF document text
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ceff23698f---lilow.pdfIn PDF document text
    • http://vinag7furniture.com/app/webroot/files/editor_upload/files/tuzebesekup.pdfIn PDF document text
    • http://cdkuysuujk.handysociality.com/upload/files/nenaju.pdfIn PDF document text
    • https://www.truckersplantparts.co.uk/ckfinder/userfiles/files/xidisev.pdfIn PDF document text
    • http://duocthientam.com/uploads/ckfinder/files/nosufoxapujobiluziguritug.pdfIn PDF document text
    • http://computer-rudolstadt.de/upload/file/jolarafawedojibiludir.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/16148a1ab4df5f---kasupixefigasivinuzo.pdfIn PDF document text
    • http://dishandspoonproductions.com/ckfinder/userfiles/files/dunitoxowominefamitep.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/539d9fc1e9639e67bcdf5f43e43d168f/bufafedabuwuwofizi.pdfIn PDF document text
    • http://biomax.shop/filespath/files/20210922202134.pdfIn PDF document text
    • https://dbjadow.pl/attachments/file/65281386162.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=android+recover+contactsPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ae46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE46 14176 bytes
SHA-256: f1dfaa3a93898ba6ddae69120dd041c97314b80efe55619837b3557a66f6ff54
font_01_sfnt_off0000d1ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1AC 10364 bytes
SHA-256: 23511059075653ddf09e41b08146693852a788ce6f08eca9d8bea8588c76196e
font_02_sfnt_off0000e943.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE943 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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