Malicious PDF — malware analysis report

Static analysis result for SHA-256 1bf0688d9e36cde7…

MALICIOUS

PDF

86.5 KB Created: 2021-07-21 19:54:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 16d6441ef1e661755018304ee15bb66a SHA-1: c471c4cb869393f639a70152bbbe54a7e232dd63 SHA-256: 1bf0688d9e36cde7a52f0e8d1e2c5965c9b8e888dd0b15623da8fabac9fca93b
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a high-confidence ML classifier and ClamAV, indicating malicious intent. It contains numerous links, many pointing to compromised CMS upload directories and disposable hosting, suggesting it functions as a link farm. The primary purpose appears to be directing users to potentially malicious external websites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://ned.ru/uploads/files/21694223128.pdf In PDF document text
    • https://ceilford.org/wp-content/plugins/super-forms/uploads/php/files/9a03db15b5182b3b3b5bb7f35b30703a/butipadilebonenojufa.pdfIn PDF document text
    • http://smclassof57.org/clients/34860/File/koxapijaro.pdfIn PDF document text
    • https://www.hausbootgeiseltalsee.de/wp-content/plugins/super-forms/uploads/php/files/4u4s8rmn7o9e8a237lbq2tcp09/40662565421.pdfIn PDF document text
    • https://propbrains.com/wp-content/plugins/super-forms/uploads/php/files/u5o1bb8pued9jk0qtc1qadsr27/9285026873.pdfIn PDF document text
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/d88f27bf47b92acf7ff04e7e2f5e9273/39534878802.pdfIn PDF document text
    • https://apexforestservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d8de81e4f9---wanotedetuluzegikanugefe.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c752f01aaa9---tipikipekixiw.pdfIn PDF document text
    • http://afgventuregroup.com/cfiles/file/zuzufugijamelodetar.pdfIn PDF document text
    • http://detskaoptika.cz/ckfinder/userfiles/files/35900911910.pdfIn PDF document text
    • http://stellamaris.cz/userfiles/95577797244.pdfIn PDF document text
    • https://candica.pl/ckfinder/userfiles/files/99952994438.pdfIn PDF document text
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b8b8be2463b---vofupag.pdfIn PDF document text
    • https://mikepromedia.com/wp-content/plugins/super-forms/uploads/php/files/s3n6fkikmljqmd0objkcnvtbg1/30375887104.pdfIn PDF document text
    • https://www.areatransfers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1cf67782cd---libijalejogapegusam.pdfIn PDF document text
    • http://lalinpress.es/ckfinder/userfiles/files/89890801448.pdfIn PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/1606fc30d825f6---83132960009.pdfIn PDF document text
    • https://cor.org.ar/wp-content/plugins/super-forms/uploads/php/files/7kql3c9et321vbiv87gd623njh/latetefa.pdfIn PDF document text
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/06bce3bc870a11d575cf18cc31ec88f5/napamijefenokem.pdfIn PDF document text
    • http://brooklynsmokeshops.com/admin/images/file/22430597865.pdfIn PDF document text
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160b312a949719---piked.pdfIn PDF document text
    • http://devitohomesorlando.com/userfiles/files/80636359005.pdfIn PDF document text
    • http://mosjob.ru/images/file/dabemaw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=important+qualities+of+a+good+supervisorPDF 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_off0000ef3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF3F 11104 bytes
SHA-256: 8eef23f8f509c6d2a16ae1b90a7a8c05ad38cc96b3516c2db8f9af8ec129b762
font_01_sfnt_off0001089b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1089B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000120ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120AD 16496 bytes
SHA-256: e9bb73f163ef1b6fc4b8e0b73135b761e7787ee3a7bbd5de75c30c91d80ca7b6

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