Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7ec3340b6b258ab…

MALICIOUS

PDF

80.2 KB Created: 2021-09-03 06:11:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: e61b5ef5d5f262ae932163837cdc4cf6 SHA-1: 480daa302683b1bd61072aa6a43c3d8a647f6a10 SHA-256: b7ec3340b6b258abf8a3c0e29529a775d6d9ee53ee44b0fe3f70e9a9ce1392ab
192 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple links, some pointing to IP addresses and compromised CMS upload directories, suggesting it's designed to download further malicious content. The heuristic 'SE_INVOICE_LURE' indicates the document's content is a deceptive invoice or payment request, intended to trick the user into interacting with the malicious links. The presence of embedded JavaScript (T1059.007) further supports the malicious intent, likely to facilitate the download and execution of a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

Heuristics 9

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://vinhthuan.com/upload/files/tavogigutufataxisezirote.pdf In PDF document text
    • https://jjcfurnituremaker.com/userfiles/files/dorasugamanus.pdfIn PDF document text
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16082ff28c3c84---54574368434.pdfIn PDF document text
    • http://porpora.biz/imagenes/imagenes_contenidos///tumutepolasora.pdfIn PDF document text
    • http://dytac.hk/userfiles/3694509014.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c84c35e0dc---10280308516.pdfIn PDF document text
    • https://www.vedaaz.com/wp-content/plugins/super-forms/uploads/php/files/06cd32cd5fd6f55ec5db4a5666ef44b7/80609575851.pdfIn PDF document text
    • https://seataclightingalaska.com/wp-content/plugins/super-forms/uploads/php/files/19be372a5c87747d7341fbf636461aec/50709707849.pdfIn PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/1609dfbc10dbf2---99840365389.pdfIn PDF document text
    • http://security-m.jp/tool/images/file/kazowatojazukenoduwavuli.pdfIn PDF document text
    • http://protradingindia.net/userfiles/file/88223710252.pdfIn PDF document text
    • http://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612bf79ac78d2---dolifupezatemunure.pdfPDF link annotation
    • http://au-zlato.sk/upload/files/13950414681.pdfIn PDF document text
    • https://imad0c0.com/js/ckfinder/userfiles/files/12560670041.pdfIn PDF document text
    • http://studiotecnicoarduini.eu/userfiles/files/fogaduxagujololexigil.pdfIn PDF document text
    • http://morethancars.nl/uploads/edytor/file/86039088329.pdfIn PDF document text
    • https://anfauglir.com/images/file/73609701287.pdfIn PDF document text
    • http://spbmedax.ru/sites/default/files/uploads/47734186591.pdfIn PDF document text
    • https://venusnvs.com/userfiles/file/wapipubezuk.pdfIn PDF document text
    • http://dagmar-e.de/userfiles/file/57193758761.pdfIn PDF document text
    • http://svenstavik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b84bce9089---labevupazemajibime.pdfIn PDF document text
    • https://www.limratechnologies.net/wp-content/plugins/formcraft/file-upload/server/content/files/160822343ed82e---lepezozenepegamid.pdfIn PDF document text
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/16087b5d701887---tavukamutu.pdfIn PDF document text
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/34a3f7b9d4040c75b38ff5fb0dffadc1/49146874032.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160984c1d96257---kozefakimerije.pdfIn PDF document text
    • http://simkoongschool.com/uploads/editer/files/77933261274.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=format+of+proforma+invoice+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_off0000d9aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9AA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f1bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1BC 16028 bytes
SHA-256: a31a70db00fab49bb23c73adc47d3c320f7d18af91477cff5227667b0817ceea
font_02_sfnt_off00011b16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B16 10612 bytes
SHA-256: 5bbf2f8963d4747abe68c4e2f28f9c6d8c1a62a87bdac7f3467817098314c5ac

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