Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b75ca356e92d0cf…

MALICIOUS

PDF

78.5 KB Created: 2021-09-09 00:38:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 771a1888263fb7de0648bd359e82e669 SHA-1: 87f4b1e0bed854084a4f88af417908fa83e5eb87 SHA-256: 1b75ca356e92d0cf11f289202bc5fc1c8fa1d3fc8c1cb91f63bf44c31ccd7770
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users to malicious content. The presence of a 'download button' lure and the overall structure suggest an attempt to trick users into downloading further malware or engaging in phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 8

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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--h1aaebajlcgx.xn--p1ai/sadm_files/11162172360.pdf In PDF document text
    • http://cnc-soustruzeni.cz/files/file/lidewifumepupuwukufut.pdfIn PDF document text
    • http://unitec-egypt.net/userfiles/file/mepuzojugokupanizepinebav.pdfIn PDF document text
    • http://www.espace-hotelier.com/ckfinder/userfiles/files/78595498564.pdfIn PDF document text
    • http://touchpanelpro.com/upload/files/duzuwuzepezek.pdfIn PDF document text
    • https://acconpriti.com/ckfinder/userfiles/files/vumadivibakewubu.pdfIn PDF document text
    • http://horizonpestservices.com/userfile/14844690807.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161369357ad64c---50556172226.pdfIn PDF document text
    • http://nuyewrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/a3031ccf16b9d0c02b69cea9caccd8ac/41697883677.pdfIn PDF document text
    • http://acelybio.com/upload/files/58034842714.pdfIn PDF document text
    • https://apsco.ly/userfiles/files/getokosixulelikurutigepi.pdfIn PDF document text
    • http://charontrade.hu/data/file/93523111733.pdfIn PDF document text
    • http://gamax-moto.cz/data/dokumenty/24752766373.pdfIn PDF document text
    • https://homeuu.biz/upload/ckeditor/pages/files/vovisepoda.pdfIn PDF document text
    • http://air-separation-supplier.com/d/files/99739924819.pdfIn PDF document text
    • http://zoscm.zohukum.com/ckfinder/userfiles/files/92166227611.pdfIn PDF document text
    • http://bugskin.org/userfiles/file/bamanugakuluzerapapumod.pdfIn PDF document text
    • https://thegmsbihta.in/userfiles/file/lemokuzevozefajugepawe.pdfIn PDF document text
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/c02f0d193e866df6e357f5b42aa9ca59/nebanaveke.pdfIn PDF document text
    • https://tipresentoio.it/images/file/xekuluranikut.pdfIn PDF document text
    • https://szabobuszrendeles.hu/files/files/pabuwixejafowubivugudawi.pdfIn PDF document text
    • http://positiveforce.in/uploads/files/12616661554.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=standard+chartered+bank+app+for+androidPDF 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_off0000cab1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAB1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e2c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2C3 18484 bytes
SHA-256: 37e4dda31c06a741165f1f0f6b1e19d01547dc7cab725768f92007a72ca21496
font_02_sfnt_off00011284.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11284 10808 bytes
SHA-256: 016af0d865667901e7bf011fc2b59e2c687e98cee6e75775ccf4eb422c75cad1

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