Malicious PDF — malware analysis report

Static analysis result for SHA-256 4009b05166b4ece1…

MALICIOUS

PDF

86.3 KB Created: 2021-09-09 21:05:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: e7d8b339b596178e5d97af6ea4f86ab8 SHA-1: 4c66faa28550cf710e0eb9862918b4a87db2b786 SHA-256: 4009b05166b4ece1eea63b407313b6a1db8e0d9efc1deb67f8a825aa7beedd49
216 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ML classifiers and ClamAV, and exhibits characteristics of a phishing lure. The heuristic 'SE_SECRET_RECOVERY_LURE' strongly indicates the document's intent to solicit sensitive recovery information. While no executable scripts were directly extracted, the presence of numerous external URLs, some hosted on compromised CMS platforms, suggests a phishing campaign designed to lead users to malicious sites. The document's structure and embedded URLs point towards a phishing attack, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 https://christianklein.eu/Quansis/ckfinder/userfiles/files/tujoxolufirosatesaweneki.pdf In PDF document text
    • http://tweedehandswikkelaar.nl/app/webroot/files/userfiles/files/67870746730.pdfIn PDF document text
    • http://cokhivietuc.webthoidai.com/img-vietuc/files/25251130446.pdfIn PDF document text
    • https://evermoral.hk/upload/file/1630835231.pdfIn PDF document text
    • https://bohemiamaestro.com/webpagebuilder/ckfinder/userfiles/files/9024663490.pdfIn PDF document text
    • http://nayyaralidada.com/alpha/ckfinder/userfiles/files/kolej.pdfIn PDF document text
    • http://woodbridgeabw.com/uploads/files/ganosezedavi.pdfIn PDF document text
    • http://www.ctmmaximoravenna.com/ckfinder/userfiles/files/49353182327.pdfIn PDF document text
    • https://houstoncoinshow.org/FCKeditor/file/2083326276.pdfIn PDF document text
    • http://angarakshaksecurity.com/userfiles/file/fokabubiluxetutexifegig.pdfIn PDF document text
    • http://lawngo.net/fckfiles/54305323194.pdfIn PDF document text
    • https://bbu.vn/Images_upload/files/vibesijuwafama.pdfIn PDF document text
    • http://wwpokebar.com/uploads/files/dadejilude.pdfIn PDF document text
    • https://tjp2-hotlink-j3t.com/contents/files/vatenewegujulumix.pdfIn PDF document text
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613632ac6f7fc---lipuzilajimuv.pdfIn PDF document text
    • http://bridgeonlaw.com/filespath/files/20210904035534.pdfIn PDF document text
    • http://handlpc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/85254121257.pdfIn PDF document text
    • http://arabstina.com/ckfinder/userfiles/files/pefeledowazu.pdfIn PDF document text
    • http://phutunggiahungoto.com/uploads/files/8354431302.pdfIn PDF document text
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/161316a6cdefec---todazerexaf.pdfIn PDF document text
    • http://tecs4.com/intranet/ckfinder/userfiles/files/miwalize.pdfIn PDF document text
    • http://nenorm.com/files/files/936727254.pdfIn PDF document text
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/av8ls9hckqopue8222b5s9kak9/67865656223.pdfIn PDF document text
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161337898ca69a---14023170963.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=run+android+on+raspberry+pi+4PDF 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_off0000e8da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8DA 19324 bytes
SHA-256: 8eadadf48e853820a0b11f326df9d5bb15056146f2e6af2dcc2b6c352e5a4bdd
font_01_sfnt_off00011b19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B19 10720 bytes
SHA-256: 1323936e63408300ab68da847fa400f32ca391fa4d36d5656938e65c847ecab8
font_02_sfnt_off000133a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133A7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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