Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b4d3dd7075a0c7d…

MALICIOUS

PDF

91.0 KB Created: 2021-09-22 16:17:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 6b47634e560066bce4e2f5eecc174cd5 SHA-1: 5f749e681a0e6888c06ddd1ce05a610abd505297 SHA-256: 8b4d3dd7075a0c7dfec58d7e35583d26ef56fe89db4259dfe7f39f7cd464879d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was identified as malicious by a machine learning classifier and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, containing numerous URLs that point to external resources, some of which are hosted on compromised websites. The presence of multiple links and the use of disposable hosting suggest an attempt to distribute malicious content or phish for information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9820

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://acsalma.hu/userfiles/files/63323897695.pdf In PDF document text
    • http://xn--o39a91gvwm83kbsn.com/FileData/ckfinder/files/20210917_3741F7C41F83A730.pdfIn PDF document text
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1613227e79139b---resatasubaduvusadovak.pdfIn PDF document text
    • https://otoform.com/upload/ckfinder/files/38300098213.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/161343e74ab3ea---25496215699.pdfIn PDF document text
    • http://phannhan.vn/files/usersfiles/files/81574923739.pdfIn PDF document text
    • https://bellcera.60km.com/upload/files/borizafuxezivomukunon.pdfIn PDF document text
    • https://termoformat.md/img/files/xufumokosepen.pdfIn PDF document text
    • http://dharmapuridiocese.com/svnprojects/DHD/Source/images/files/zimelo.pdfIn PDF document text
    • http://tns-china.cn/editor_upload_image/file/33402283083.pdfIn PDF document text
    • https://fa-vietnam.com/webroot/img/files/68475089165.pdfIn PDF document text
    • http://jpind.pl/userfiles/file/78380208658.pdfIn PDF document text
    • http://fonnepal.org/userfiles/file/36834112493.pdfIn PDF document text
    • http://chandigarhdatarecovery.com/files/file/17801531263.pdfIn PDF document text
    • https://manage3.realtourvision.com/rtv/ckfinder/userfiles/images/files/71521087187.pdfIn PDF document text
    • https://muahohangnhat.com/app/webroot/uploads/files/kizigo.pdfIn PDF document text
    • http://etpatatietpatata.com/userfiles/files/46139470831.pdfIn PDF document text
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/aabd7a459d783c9624cedb48f0e86910/zekiradoxutejivimig.pdfIn PDF document text
    • http://3e3i.com/UserFiles/file///28168951031.pdfIn PDF document text
    • https://www.natursany.com/ckfinder/userfiles/files/mogifenopelusekalopeba.pdfIn PDF document text
    • https://masini-de-ambalat.ro/images/userfiles/nepevidupojejul.pdfIn PDF document text
    • http://alhambra.kopanramen.com/uploads/files/50353114181.pdfIn PDF document text
    • https://www.le-domaine-de-hauterive.fr/ckfinder/userfiles/files/78296867990.pdfIn PDF document text
    • http://nuk-amro.de/userfiles/file/42871309801.pdfIn PDF document text
    • http://findmealocalpainter.com/insurazon/admin/userfiles/file/83376332276.pdfIn PDF document text
    • http://sensitiva.fi/UserFiles/File/45533263212.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=intellectual+property+act+sinhala+pdfPDF 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_off0000ff8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF8D 17504 bytes
SHA-256: 08a7fefe22b8845006509e2f8599a8bf79153dd927f4687846168f0220c48b28
font_01_sfnt_off00012d22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D22 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014539.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14539 10880 bytes
SHA-256: 96c44080abd10b26936dd90a7c2f1f3b44bedec90b28a9edb8f0fa9a2849fd47