Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d84494059394c68…

MALICIOUS

PDF

86.3 KB Created: 2021-09-05 14:52:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 477e003ea9c7e89d780c6a3994e32e8d SHA-1: 2a63785418aa9f446184d850b526276ba276c5ea SHA-256: 5d84494059394c688f7175c2d5b34d548c47e01f896c77051b7edb6e536ac1a8
156 Risk Score

Malware Insights

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

The file is a PDF that contains a large number of embedded URLs, many of which point to compromised websites or disposable hosting. The ML classifier and ClamAV both flagged this file as malicious, specifically as a phishing or trojan variant. The presence of a link farm suggests an attempt to lure users to malicious content or to improve search engine rankings for malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://xn--80aejmo0alc.xn--p1ai/ckfinder/userfiles/files/buzozasida.pdf In PDF document text
    • https://miruyuta96.ru/admin/ckfinder/userfiles/files/93050698784.pdfIn PDF document text
    • http://korsorlampang.net/user_img/files/40102402601.pdfIn PDF document text
    • https://www.dars.bg/ckfinder/userfiles/files/37217784084.pdfIn PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a80fdd2521b---54707081975.pdfIn PDF document text
    • https://primewestelectrical.com/wp-content/plugins/super-forms/uploads/php/files/2f2668da3d173f0d48c4b6b87ea9783c/samedofazilidamiguzalaluf.pdfIn PDF document text
    • https://avantkart.com/wp-content/plugins/super-forms/uploads/php/files/sag71n3cvlfevd18303456qgpb/92452500659.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/16106452f21a94---3691193761.pdfIn PDF document text
    • http://akgikorea.com/file_upload/fck_upfile/file/kogidumoxisego.pdfIn PDF document text
    • http://newgrids.com/userfiles/file/mudiketofuja.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4778551837---58967619269.pdfIn PDF document text
    • https://hchoanglong.vn/userfiles/file/72834663321.pdfIn PDF document text
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/uekbauu2t6n5vjtobdr3717tat/futezu.pdfIn PDF document text
    • https://www.chablis-gautherin.com/ckfinder/userfiles/files/pipobifuserupurudevozi.pdfIn PDF document text
    • http://aylincinarli.com/fckfiles/file/wupodapomikadepowugo.pdfIn PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/1607c2a71c6121---38660016931.pdfIn PDF document text
    • http://cnpair.com/userfiles/file/4957406143.pdfIn PDF document text
    • https://aitalk.vn/upload/files/dedifanazotejoxawawafibat.pdfIn PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7533ebb2b---raretofowubufexow.pdfIn PDF document text
    • https://bienenaktuell.com/sites/bienenaktuell.com/files/file/69608831042.pdfIn PDF document text
    • https://transpack-krumbach.de/_upload_bilder/_filemanager/file/zosawimuvu.pdfIn PDF document text
    • http://u15.ch/ckfinder/userfiles/files/10965785103.pdfIn PDF document text
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/e81jlbl809iti8f1efvat183gq/64757174503.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=bosch+serie+4+wan28050gb+manualPDF 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_off0000e8bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8BB 18156 bytes
SHA-256: 5624a6d1485fc505df64d842768879076c78192665166707f5f4213d42c279a8
font_01_sfnt_off00011783.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11783 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012f9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F9A 11620 bytes
SHA-256: 6426296b24d933aec932286069e77b1abb75d3aca1a0dee22b07a7b993203b37

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