Malicious PDF — malware analysis report

Static analysis result for SHA-256 d3fe265b72ff60b1…

MALICIOUS

PDF

91.9 KB Created: 2021-08-04 07:36:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: b96f9c180a896a787c2f2c1d81645b2b SHA-1: 317167b80508c4baa2e5b05c17f7f6abb3271757 SHA-256: d3fe265b72ff60b12daa91094901be402f981bbfcc9c28a621b76cb8bc5de2f4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a link farm pointing to multiple compromised CMS upload directories, indicating a distribution mechanism for malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery. The presence of numerous unknown URLs on potentially disposable hosting further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9932

Heuristics 6

  • 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.
  • 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://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d9df821927---xometuduvogatorupewes.pdf In PDF document text
    • https://mangonebike.com/uploads/file/79464829872.pdfIn PDF document text
    • https://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b30a71bb7ec---57080740478.pdfIn PDF document text
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/f57ed333da6c71c4311f5818bdd5b9e6/94619114667.pdfIn PDF document text
    • http://stilistspb.online/public/files/uploads/files/vebotagusupekewetiku.pdfIn PDF document text
    • http://yuhenganquan.com/userfiles/file/20210626044253_1292777411.pdfIn PDF document text
    • http://asbu.net/uploads/FCK_files/file/18613936663.pdfIn PDF document text
    • https://cgeminfos.ma/upload/file/tozozawunedabe.pdfIn PDF document text
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/mbk5qimrmk2fejc6gj13e27oi9/letedajepubiva.pdfIn PDF document text
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/160edc40b9f91a---gepudirebopimidi.pdfIn PDF document text
    • http://pvsystexperts.com/wp-content/plugins/super-forms/uploads/php/files/5efciqd1kq4tt8jlglj5cmjch6/83565181086.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160805d603c444---wovinenikewa.pdfIn PDF document text
    • http://studiocastigli.eu/userfiles/files/zemelap.pdfIn PDF document text
    • https://immo-cjeanpaul.lu/userfiles/files/72419014679.pdfIn PDF document text
    • https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/45151b4342145e0db77eaf0a0b261ae0/fumem.pdfIn PDF document text
    • http://fapannimario.it/userfiles/files/gemupedefazogomupiwe.pdfIn PDF document text
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c495408c19d---fesar.pdfIn PDF document text
    • https://fmpride.com/wp-content/plugins/super-forms/uploads/php/files/5a78bca0aa06fa668cc61d2984c8929a/84805747547.pdfIn PDF document text
    • http://zvezda-rostov.ru/ckfinder/userfiles/files/45224719315.pdfIn PDF document text
    • http://lakes77.com/clients/47041/File/wejetekasasu.pdfIn PDF document text
    • https://greshamgilessalon.com/wp-content/plugins/super-forms/uploads/php/files/b69e9912989acc0d4ec63870d88ba877/94071435070.pdfIn PDF document text
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/fgah6pk5vt610jg9d20f7udb3g/45849940708.pdfIn PDF document text
    • http://zonwering-belgie.com/ckfinder/userfiles/files/jugimeda.pdfIn PDF document text
    • http://art-wonders.com/ckeditor/ckfinder/core/connector/php/uploads/files/fifasaxanipukorapipezada.pdfIn PDF document text
    • http://tuvanluatdanang.com/upload/ck/files/xodokitadanafom.pdfIn PDF document text
    • http://novussiteyonetimi.com/uploads/file/zudapanifogofiwazeje.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=what+are+the+4+phases+of+mitosisPDF 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_off0001055a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1055A 10544 bytes
SHA-256: abae84d30f365e9b63abcddbb45f7743fef267e63c0b3ec9d8505abd76db8afb
font_01_sfnt_off00011d78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D78 16824 bytes
SHA-256: 37deafa92a7982f80f4a3c23079a436f2a5301bb45b8705c47b75b7c42ffc000
font_02_sfnt_off000148f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x148F6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1