Malicious PDF — malware analysis report

Static analysis result for SHA-256 888af0c47fbfab95…

MALICIOUS

PDF

73.3 KB Created: 2021-09-04 06:02:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 936297b5b9f28445d9fbdba391bfe294 SHA-1: 85883adfe3daf336a1e8c8faf5646e68efd97fb7 SHA-256: 888af0c47fbfab95c2338f0c4c360fdbf5bb69a9e7407dc9f5952f72e9066907
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 https://krisoc.ru/uplcv?utm_term=multiple+intelligences+book+pdf PDF link annotation
    • https://baatco.com/ckfinder/userfiles/files/6469994073.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f40c17e4a5---nafotisudifirotifobiwo.pdfIn PDF document text
    • http://ckpak.com/fckeditor/userfiles/file/89071305680.pdfIn PDF document text
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/160d95bbe02942---11803336800.pdfIn PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/16098a8ca00553---54782775152.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/1ppcoooh8iehagug0n2s83g052/37728040206.pdfIn PDF document text
    • https://avflash.nl/upload/files/maponivutoposatetuzatugo.pdfIn PDF document text
    • https://suativisamsungtaihanoi.net/upload/files/7763058695.pdfIn PDF document text
    • http://itkaufmann.com/images/fckimages/file/84011147074.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/ldgt4nr2loi22ompfed0d3fnv4/75604875728.pdfIn PDF document text
    • http://kroonzuivel.nl/ckfinder/userfiles/files/toxexakamububufizidajiju.pdfIn PDF document text
    • https://relleno-acidohialuronico.com/wp-content/plugins/super-forms/uploads/php/files/096eab0a58c89bfce4fe9f48a7fb131a/97063518251.pdfIn PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612cf32350bdb---60204140489.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/e9df9a32468361a8d21afcfebcb6bcc3/jiwalogepot.pdfIn PDF document text
    • https://militarynetwork.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1606d0ca2a7892---71415437563.pdfIn PDF document text
    • http://mmckno2010.zkosuchdol.info/files/xukowufegodoxepetej.pdfIn PDF document text
    • https://condominiovillage.com/userfiles/file/kufof.pdfIn PDF document text
    • http://ingmontagna.com/userfiles/files/xezonotovufixorigin.pdfIn PDF document text
    • http://vilaportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160768fdb13a98---877885883.pdfIn PDF document text
    • http://baigeleather.com/userfiles/file/26918327400.pdfIn PDF document text
    • http://anhuifan.com/upload_fck/file/2021-5-16/20210516203425852275.pdfIn PDF document text
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b75bf0e240e---89237588638.pdfIn PDF document text
    • http://viral-list-machine.com/ckfinder/userfiles/publics/files/zeduvuz.pdfIn PDF document text
    • 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_off0000bb56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB56 17144 bytes
SHA-256: a851f9ebfe834b7a019a03181f8eeb43100c0f898ff03030abba17279216ee9d
font_01_sfnt_off0000e72a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE72A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ff41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF41 10860 bytes
SHA-256: 9c00b6c6a7f83038ae40185d8d835e75846792e3afa4162388a2571898820f6a

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