Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b8faeee8c8a3b1b…

MALICIOUS

PDF

82.8 KB Created: 2021-09-06 04:52:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: bac49c50092bff94ed5ed87adab40438 SHA-1: f61bac2c756878350195ee737787776ae57b88f2 SHA-256: 0b8faeee8c8a3b1b8b025daf7e8c9a97998bbbd90e784b8536aa14bdb21418b5
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains embedded JavaScript and numerous external links, many pointing to compromised WordPress sites or disposable hosting, suggesting it functions as a link farm or downloader. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this, indicating the document is designed to distribute or redirect to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160cf9b8045271---sozetawekotu.pdf In PDF document text
    • http://porpora.biz/imagenes/imagenes_contenidos///31669478037.pdfIn PDF document text
    • https://peptidturkiye.com/ckfinder/userfiles/files/muzujew.pdfIn PDF document text
    • https://www.corridar.com/wp-content/plugins/super-forms/uploads/php/files/lp8d9rds1lomahg3cqs192op4k/44290825018.pdfIn PDF document text
    • http://ventilatoryzlin.cz/images/file/xizolu.pdfIn PDF document text
    • https://m-co.de/wp-content/plugins/super-forms/uploads/php/files/i396qpifrkv4pqbqi4ri31um1u/47141084527.pdfIn PDF document text
    • http://reclameindex.nl/images/uploads/nojutonumavoraki.pdfIn PDF document text
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/3okbcm5q9dihe6cajiodtlsjn1/56913907095.pdfIn PDF document text
    • https://kogan-photo.ru/wp-content/plugins/super-forms/uploads/php/files/db94c56feb164388d0fa636245ed5d7b/94781672015.pdfIn PDF document text
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16115cf54e30e6---74713317312.pdfIn PDF document text
    • https://genesislighting.net/wp-content/plugins/super-forms/uploads/php/files/c0db4577ad0d67f977d731fb0e1231bc/sufonutexileje.pdfIn PDF document text
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/16129623401348---50442022492.pdfIn PDF document text
    • http://www.santabriganti.org/admin/ckfinder/userfiles/files/77222344236.pdfIn PDF document text
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16098295df211a---51729380003.pdfIn PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f72c875c51---54386564564.pdfIn PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16091fbccbc951---20756147061.pdfIn PDF document text
    • https://bhsbeacon.com/FCKeditor/file/geneginugi.pdfIn PDF document text
    • http://aeskulap24h.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609657a8060b2---getuwukoris.pdfIn PDF document text
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/3a14916060cc2a34c304ca8aac2c80e8/zeruzemumugegu.pdfIn PDF document text
    • http://anthonyvienna.com/sites/default/files/file/xamoguzamuwisamedosikofe.pdfIn PDF document text
    • http://mevlanaasm.com/resimler/files/vekewovewil.pdfIn PDF document text
    • http://yugang360.com/upload_fck/file/2021-8-25/20210825070916846275.pdfIn PDF document text
    • http://www.provinces.cmcgeneralate.org/files/js/ckfinder/userfiles/files/71476260639.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c549ec275a---75867469383.pdfIn PDF document text
    • http://bjzjygj.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/10074466675.pdfIn PDF document text
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a25392f310c---pibilikorakifep.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=pitiriasis+rosada+pdf+pediatriaPDF 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_off0000e12e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE12E 17260 bytes
SHA-256: aed85b87c228ab9f8f3b4175cf9b545ff2b19e1552ff90da259f68112d38a81b
font_01_sfnt_off00010ddd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DDD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000125f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125F4 10340 bytes
SHA-256: 2501a1b51c10d3f07e36a5936e59413b22f692f258b833d1cee3a0382eb52d70

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