Malicious PDF — malware analysis report

Static analysis result for SHA-256 70b228c710258214…

MALICIOUS

PDF

88.4 KB Created: 2021-08-08 17:02:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 8e5563f9c16ca48798a96125526ebbda SHA-1: a311f63afec3a2efe747275b6b2b5979b8424974 SHA-256: 70b228c710258214d1e942001de61a77aca5f0e1d58a8640a8f353f423c50a7d
156 Risk Score

Malware Insights

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

The PDF contains numerous links to compromised websites, indicating a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly suggest malicious intent. The presence of external URIs and link farms on disposable or compromised hosting further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

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://catamma.ru/uplcv?utm_term=steps+to+make+arroz+con+dulce PDF link annotation
    • http://scissortailfarms.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089f5ad9e360---79587568281.pdfIn PDF document text
    • http://gonuldoviz.com/upload/ckfinder/files/22199298823.pdfIn PDF document text
    • https://atlanthealth.com/wp-content/plugins/super-forms/uploads/php/files/e812e80fbf4b34b03442d24ad6a9bbde/zutigapimib.pdfIn PDF document text
    • https://ratsimae.ee/media/contents/file/nopiriniresagateliloveko.pdfIn PDF document text
    • http://hgbs.de/userfiles/file/316936905.pdfIn PDF document text
    • https://foodvellythailand.com/upload/files/romowav.pdfIn PDF document text
    • https://alatheir.com/atheirwsfiles/file/wosezomopakamegomopiniro.pdfIn PDF document text
    • https://www.masismarketing.com/wp-content/plugins/super-forms/uploads/php/files/8b085262cdfc519a596e780f979c298a/bavugefina.pdfIn PDF document text
    • http://vladjurnalist.ru/archive/file/saxikowibidakomuw.pdfIn PDF document text
    • https://www.d-table.com/wp-content/plugins/super-forms/uploads/php/files/907c2719f8a561cbf35fdddaec261925/nuvedili.pdfIn PDF document text
    • https://www.eziblank.com/wp-content/plugins/super-forms/uploads/php/files/2453f1bea33bfbee2acb5774e2cd5102/12769494672.pdfIn PDF document text
    • https://vicotelecom.vn/static/source/images/file/52442705996.pdfIn PDF document text
    • http://aeskulap24h.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a79996eea16---53513292622.pdfIn PDF document text
    • https://louvre.lv/res/wysiwyg/file/39315015213.pdfIn PDF document text
    • https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/38f974345b85c30f0f054cf43ce66431/nelaxuxexasi.pdfIn PDF document text
    • https://vaytieudungtragop.com.vn/wp-content/plugins/super-forms/uploads/php/files/0nclaek767j9fph9cnooioo2gl/gebuvefipufadakimuv.pdfIn PDF document text
    • http://www.tiande-global.com/ckfinder/userfiles/files/putitijolubabor.pdfIn PDF document text
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d4e2c0ad7e---48884513476.pdfIn PDF document text
    • http://uktohabbarijamalta.com/files/file/56896427892.pdfIn PDF document text
    • http://thietbianninh188.com/uploads/files/dapabusodufetenovugebef.pdfIn PDF document text
    • https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/cb31e04786b8a0a6367803930631ee23/vaxisalopanitabagu.pdfIn PDF document text
    • http://mattstergamer.com/wp-content/plugins/super-forms/uploads/php/files/4uelkvcli4ihltv0pcan2o997c/23389133775.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_off0000f28a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF28A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010a9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A9C 18712 bytes
SHA-256: baf8449cf374e8781ece700f28959daef20cee9d922484f6460ebc7451d213f1
font_02_sfnt_off00013ad4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13AD4 10912 bytes
SHA-256: 3d1154c9a447923f7a459ef050c0391f8f76a0839105a2c64c1c605b5cbe5fe0

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