Malicious PDF — malware analysis report

Static analysis result for SHA-256 900477ddb5fbb0df…

MALICIOUS

PDF

89.7 KB Created: 2021-09-04 11:26:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 090af1a503fd28c2e076f2c650b06078 SHA-1: 2ac966ab7ec8060b0b73592d7fc57cce4aad4a1a SHA-256: 900477ddb5fbb0df22dde0872c64a172c7de120a311d2322ed32d9621b61b17c
216 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged by multiple heuristics, including a critical detection for a 'Recovery secret / private key request' lure. The document's structure and embedded URLs suggest it is part of a phishing campaign designed to trick users into divulging sensitive information. While no scripts were explicitly extracted, the presence of numerous links to potentially compromised websites and the nature of the lure indicate a malicious intent to deceive users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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
  • Recovery secret / private key request critical SE_SECRET_RECOVERY_LURE
    Document requests recovery phrases, private keys, backup codes, or saved passwords. Requests for these secrets in a document are high-risk.
  • 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://yuanhebiotech.com/upload/files/vulawomaxogarumetotoridav.pdf In PDF document text
    • http://saptpadi.com/files/file/19871857399.pdfIn PDF document text
    • https://pcparts.fr/ckfinder/userfiles/files/pebelijavurikixo.pdfIn PDF document text
    • http://izumrud38.com/ckfinder/userfiles/files/jutitel.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/o74ashiku5h6dvmqca0j4fiv30/xusevo.pdfIn PDF document text
    • http://videoacceso.com/wp-content/plugins/formcraft/file-upload/server/content/files/16129ddf65335d---pagenojifel.pdfIn PDF document text
    • https://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/c51set0hbkp5dakaf3umspst7d/59282977479.pdfIn PDF document text
    • http://bjbtrh.com/files/pic/file/tinuzononor.pdfIn PDF document text
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1608425213e391---95762321480.pdfIn PDF document text
    • https://www.myjamaicais.com/wp-content/plugins/super-forms/uploads/php/files/e672ff4b391e6a1b4a724aa1d0f4e6e7/kirudiminefufefakugo.pdfIn PDF document text
    • https://cochleartudaskozpont.hufiles/23869590853.pdfIn PDF document text
    • https://webmedcentralplus.com/userfiles/file/kavomikijuwajetidogiro.pdfIn PDF document text
    • http://work4shop.cz/userfiles/file/16129039357.pdfIn PDF document text
    • http://geologocarmignani.com/userfiles/files/ramujidanesab.pdfIn PDF document text
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c9428be71e1---zajozafotexujetoxaf.pdfIn PDF document text
    • https://florerialafloresta.com/ckfinder/userfiles/files/55208346795.pdfIn PDF document text
    • http://cateringkieuan.com/uploads/userfiles/file/gupubebojagozusidosivuvu.pdfIn PDF document text
    • https://iamtimeshare.com/userfiles/file/wijiwudifejekojodu.pdfIn PDF document text
    • http://studiophotosfashion.it/userfiles/files/45860302722.pdfIn PDF document text
    • http://www.zywawiara.pl/pliki/nujexokixaxekolorafapepo.pdfIn PDF document text
    • https://mingyi-lock.com/data/file/userfiles/files/momafopedekinawukobo.pdfIn PDF document text
    • https://hometeamcorp.com/images/usr/luxajijedutesavibenenevum.pdfIn PDF document text
    • http://shreejians.com/userfiles/file/lopolijusozuliwawe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=vba+worksheet+cells+functionPDF 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_off0000f738.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF738 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010f4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F4F 10820 bytes
SHA-256: 90d44bd6239ef804fd2fe5caf26f114f1462a8e18e6df01abc9711ff06b3f39e
font_02_sfnt_off0001284f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1284F 18436 bytes
SHA-256: 194bb3af5edf53dcb3371978b616a57c44d7136c3c47ad5babc720777e5fe43c

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