Malicious PDF — malware analysis report

Static analysis result for SHA-256 e27cdce6ba5b24b3…

MALICIOUS

PDF

80.1 KB Created: 2021-09-19 09:57:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 11aba88faa4e4cbd2b08519d9557252a SHA-1: 5e67ab1b1dac868393539b2087e264f5c0dacc49 SHA-256: e27cdce6ba5b24b3f32494c1471d67030f33e5e09006c4403f373094fbe7cd08
176 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. Numerous heuristics indicate the document functions as a link farm, directing users to various external websites, some hosted on compromised CMS platforms or disposable hosting. The presence of multiple URLs, including one pointing to a raw IP address, strongly suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://pixomot.ru/uplcv?utm_term=how+to+check+installed+apps+in+play+store PDF link annotation
    • http://harryreichert.de/uploaded_pics/News/file/sududoxofumalozaluribuwu.pdfIn PDF document text
    • http://ancheng-medical.com/uploadfile/files/36516086659.pdfIn PDF document text
    • http://185.33.116.142/~bbyacht01/upload/files/25899501417.pdfPDF link annotation
    • http://akinmedical.com/uploads/file/51154092995.pdfIn PDF document text
    • https://www.wappa.com.au/siteadmin/ckfinder/userfiles/files/57265272538.pdfIn PDF document text
    • https://keralatemples.info/ckfinder/userfiles/files/95960390307.pdfIn PDF document text
    • https://pelletier-tp.fr/ckfinder/userfiles/files/84215175250.pdfIn PDF document text
    • http://thuephotocopytaihanoi.com/upload/files/53041620483.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/16136679537b99---viresibijud.pdfIn PDF document text
    • https://aljuboori.com/userfiles/files/64862773930.pdfIn PDF document text
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/jt187ht6rrqfaukpsa4eb9kh95/77894617243.pdfIn PDF document text
    • http://studiodelcorso.eu/userfiles/files/wagebupik.pdfIn PDF document text
    • http://paliukenas.lt/i/File/mewugevomikopebizi.pdfIn PDF document text
    • https://cryptobasics.biz/uploads/files/lararudala.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16146aa6ecef75---dekaragogagi.pdfIn PDF document text
    • http://prograsifkalip.com/files/perese.pdfIn PDF document text
    • http://baobianhkhang.com/upload/files/dinipo.pdfIn PDF document text
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f86ba2f2de---10645575663.pdfIn PDF document text
    • http://studioingegneriavaragnolo.com/userfiles/files/47990221322.pdfIn PDF document text
    • https://austarpharma.com/upload/files/sidanu.pdfIn PDF document text
    • http://enewind.com/pliki/file/sonikogogenavedotefa.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_off0000d3db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3DB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ebed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBED 17768 bytes
SHA-256: 2c238dbf153346ead44fcafe281b7a9c49cda975da635bdd7db5a82e0d6398e7
font_02_sfnt_off0001198c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1198C 10892 bytes
SHA-256: 682125ff48a05c85651afe7e277f0eae1d4c322b73d66637a1a16f54708d5823

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