Malicious PDF — malware analysis report

Static analysis result for SHA-256 4791263a21873268…

MALICIOUS

PDF

83.7 KB Created: 2021-09-07 12:13:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: c776ab9b020b9f332ed5944e45d6142a SHA-1: 293717964b47c44ce7a9a51e20bd99ce0dd2b80d SHA-256: 4791263a21873268bfc3a18192dd437d7529ba88d90002988cda036dea7e53e0
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code or redirecting users. The presence of numerous links pointing to compromised CMS uploads and disposable hosting suggests a link farm designed to obscure the ultimate destination or host malicious files. ClamAV detection further supports the malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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
  • 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.
  • 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://frankslawfirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/68553295417.pdf In PDF document text
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083b1963ff4e---fivedivapoxixegeloz.pdfIn PDF document text
    • https://evrenmentese.com/upload/ckfinder/files/juxilozedodawuxosejax.pdfIn PDF document text
    • https://rieker-consulting.eu/files/file/49999959263.pdfIn PDF document text
    • https://atolab.it/wp-content/plugins/super-forms/uploads/php/files/24f377b934890d424661a94c83229dd0/95117260268.pdfIn PDF document text
    • https://hoangphatdanang.com/uploads/image/files/99280137906.pdfIn PDF document text
    • http://ppfi-online.com/userfiles/file/vepamokavigitaponubepokug.pdfIn PDF document text
    • http://alliance-ltd.com/userfiles/1085317848.pdfIn PDF document text
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a96e91d4c3a---tegizujoworaroxeg.pdfIn PDF document text
    • http://harrisonfamilyreunion.org/clients/868801/File/duronovekofuvewiju.pdfIn PDF document text
    • https://ceilford.org/wp-content/plugins/super-forms/uploads/php/files/6ca7388b7a5c44f15388e9f0065e4942/wutipafifuwipuzow.pdfIn PDF document text
    • http://zhengfutz.com/v15/Upload/file/202162016562041.pdfIn PDF document text
    • http://neodev.space/wp-content/plugins/formcraft/file-upload/server/content/files/1608f9bd47e175---49979700844.pdfIn PDF document text
    • http://interstroy96.ru/uploads/files/68300051335.pdfIn PDF document text
    • https://sensiblemachines.com/ckfinder/core/connector/php/files/38722286435.pdfIn PDF document text
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a65f5be575d---25322815898.pdfIn PDF document text
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/16097ebe2c6170---bitazuwupe.pdfIn PDF document text
    • https://www.servicioscalibrados.com/wp-content/plugins/super-forms/uploads/php/files/9e6643e0511de1f1905278183729bdaa/10351251240.pdfIn PDF document text
    • http://auroraenergyproject.it/userfiles/files/dibalemoromirabela.pdfIn PDF document text
    • https://protectname.xyz/whoisprivacy/userfiles/files/mumularelopazugasojen.pdfIn PDF document text
    • http://tomei4x4.jp/js/upload/files/71820727915.pdfIn PDF document text
    • http://rm-centr.ru/uploads/file/83807275492.pdfIn PDF document text
    • https://www.finestkindcharter.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b45d0527004---bijuvizoj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=accounting+practice+problems+and+answers+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_off0000e109.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE109 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f920.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF920 11268 bytes
SHA-256: f8c9dfe4f73aa4422bed3d6a270f52b24e6640864c173ad55c22c8cbc2cc64c4
font_02_sfnt_off00011346.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11346 17796 bytes
SHA-256: 8b201455fc9367132264f257787208c889485db3fc01bf4b417c30a90e72d741