Malicious PDF — malware analysis report

Static analysis result for SHA-256 277e201fd6f3695d…

MALICIOUS

PDF

93.8 KB Created: 2021-09-20 18:57:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: b09512550f53fc8bfbed7b5591920557 SHA-1: bb280e12cffbce52d23c090df4de242ae1573b4b SHA-256: 277e201fd6f3695d9667ebd79762409ccfb83fd00459d8b2da0ab10e068e19bf
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, directing users to multiple external websites, some of which are hosted on compromised WordPress upload directories. The presence of numerous links on disposable hosting further suggests malicious intent, likely to distribute further malware or conduct phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://sicilalluminio.it/userfiles/files/mokuraguzolavejeg.pdf In PDF document text
    • http://greensketch.in/userfiles/file/betisuvewuzibuzisisinag.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613295cfe14d3---70685165775.pdfIn PDF document text
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614174a0a8af6---fuxebovemeresoxugegavod.pdfIn PDF document text
    • http://garmaclima.com/uploads/ckfinder/files/mukedoperijefusetotakur.pdfIn PDF document text
    • http://fazendasaojudastadeu.net/fotosempresa/files/52492288212.pdfIn PDF document text
    • http://global-gypsum.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614517036bd1c---nupududemexuna.pdfIn PDF document text
    • https://masini-de-ambalat.ro/images/userfiles/11461381122.pdfIn PDF document text
    • http://ebonit.light.bg/includes/libs/ckfinder/userfiles/files/defejasofa.pdfIn PDF document text
    • http://gardena.crazyrockinsushi.com/uploads/files/87810887894.pdfIn PDF document text
    • http://cutskytools.com/d/files/47448249610.pdfIn PDF document text
    • https://qamarapps.com/wp-content/plugins/formcraft/file-upload/server/content/files/16147bbd32524f---27154373462.pdfIn PDF document text
    • https://venusnvs.com/userfiles/file/vonemogo.pdfIn PDF document text
    • http://decorstore.eu/upload/file/penawoxi.pdfIn PDF document text
    • https://www.hkfew.org.hk/ckfinder/userfiles/files/kutupevu.pdfIn PDF document text
    • http://vom-ragnaroek.de/uploads/file/mutupume.pdfIn PDF document text
    • https://boyanbolyarski.com/userfiles/file/sawujojesopozafexor.pdfIn PDF document text
    • http://aftp.bg/userfiles/file/23931937539.pdfIn PDF document text
    • http://themadthinker.com/temp/vinney/HTML/userfiles/file/97395229065.pdfIn PDF document text
    • http://orderleesushi.com/uploads/files/wugixifisokedat.pdfIn PDF document text
    • https://jkmart.net/FCKFiles/File/66793613038.pdfIn PDF document text
    • https://diphong.com/uploads/46382646653.pdfIn PDF document text
    • http://asvpp.fr/pdf/keveratesado.pdfIn PDF document text
    • https://cylinder96.ru/admin/ckfinder/userfiles/files/97169867546.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=papa%27s+donuteria+hackedPDF 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_off0001043d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1043D 10792 bytes
SHA-256: 8173c654eee593093ebc9b997bb22334e98758da4d1b56535c8fc5b8cb2f924e
font_01_sfnt_off00011d18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D18 20036 bytes
SHA-256: 83d0015f5bed3e99e8b8c0a019dd4596dc981f50d454cbb7033db8e43614bc45
font_02_sfnt_off00015159.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15159 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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