Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8e27426a7eaf78a…

MALICIOUS

PDF

84.5 KB Created: 2021-09-03 13:13:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: b87d087b1f16336e830ac9a19a679915 SHA-1: 0361900493a3f7cf21ef3ae1178bd4d844b4f9e3 SHA-256: c8e27426a7eaf78abfb6a21b4fc022a0288fbceffc33425edbc931b719c71bb8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/jq7khm17fifcdl2ab3n2gnkb54/fejasoko.pdf In PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/160cd930312d99---94204563600.pdfIn PDF document text
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d28e57df44---mirarogi.pdfIn PDF document text
    • http://1yunnan.com/ckfinder/userfiles/files/nariv.pdfIn PDF document text
    • http://askort.pl/Upload/file/bolefegovodavujus.pdfIn PDF document text
    • https://puppometalli.eu/file/fotalatexo.pdfIn PDF document text
    • https://www.dynasil.com/wp-content/plugins/super-forms/uploads/php/files/4318f09a986a3b19857e72abba0e0d13/65730728824.pdfIn PDF document text
    • https://hagepoorter.be/files/files/nixugejokigojonojovuvuzus.pdfIn PDF document text
    • http://agendaalzheimer.org/files/galeria/files/29201291188.pdfIn PDF document text
    • https://bitree.com/ckfinder/userfiles/files/88273285405.pdfIn PDF document text
    • http://lohs69.com/clients/82366/File/juvabo.pdfIn PDF document text
    • http://prime42.ru/userfiles/files/zeber.pdfIn PDF document text
    • http://duszek-lasu.pl/userfiles/file/48528030774.pdfIn PDF document text
    • https://izometal.net/mm/file/tefuwavegelebewulogasipil.pdfIn PDF document text
    • http://frezerovka.by/images/fxeditor/file/52966781294.pdfIn PDF document text
    • http://malifer.hu/upload/file/mevamariwesalufekododob.pdfIn PDF document text
    • http://chinajnbt.com/images/upload/File/mesigaf.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160779effee974---14420133650.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/netfgbenatfj613gmrqj3np793/mitafegepis.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/1608211c783dba---66823653919.pdfIn PDF document text
    • http://staging.impactredevelopment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086b77f4cfdd---kisajaxude.pdfIn PDF document text
    • http://www.jucadent.es/ckfinder/userfiles/files/10210994297.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6ad2cd1a9e---jisiworubagaxokekogaf.pdfIn PDF document text
    • https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/21233a63cf427d5136651655823255f6/topixugogabawejufadegul.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=lg+tv+service+manuals+free+downloadPDF 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_off0000e51a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE51A 17620 bytes
SHA-256: bdcef7e69b57b9d76d0ecb466deb04d28670f5fad24454dff5ed743cdbb5b03d
font_01_sfnt_off00011294.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11294 11028 bytes
SHA-256: e564ef73a7305610e6fd8184b75e89e2c2a514af8fbf0cce0e9b7ab993af12e9
font_02_sfnt_off00012c18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C18 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1