Malicious PDF — malware analysis report

Static analysis result for SHA-256 9fc46766f3b6316b…

MALICIOUS

PDF

86.4 KB Created: 2021-07-22 00:53:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: db17b5d478116f86a5a0c237130fdb27 SHA-1: b14520f053520ac4215b177e19d4551e1f0e3a90 SHA-256: 9fc46766f3b6316b9ac36ba2045575bb8093681735d8fde2d4a3c9f4883bf86b
156 Risk Score

Malware Insights

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

This PDF file was flagged by ML classifiers and ClamAV as malicious. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites and other disposable hosting. The primary purpose appears to be directing users to malicious content, likely for phishing or to download further malware, aligning with a spearphishing attachment attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://www.aironface.com/wp-content/plugins/super-forms/uploads/php/files/1975e8d97257465540486bdfc1a75d52/tojisikazasefexuvoguluj.pdf In PDF document text
    • https://www.popcaffe.it/wp-content/plugins/super-forms/uploads/php/files/74ebc171ccd805c33437dd2662ab1cc5/doxaladadurekutowo.pdfIn PDF document text
    • https://vannordenvastgoed.nl/userfiles/file/1946536655.pdfIn PDF document text
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608e1d78776ce---43125155014.pdfIn PDF document text
    • http://www.motionmantra.com/userfiles/files/98603752696.pdfIn PDF document text
    • http://szentimresiklos.hu/upload/file/nujufazevejamo.pdfIn PDF document text
    • http://cuatro-pr.org/sites/default/files/file/1600713015.pdfIn PDF document text
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/f35h3pcv3ibkrvoaio9tecrf2t/tetitesegilaba.pdfIn PDF document text
    • http://avanti-kuhni.ru/upload/files/tapawegomat.pdfIn PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16089321e78281---23830048762.pdfIn PDF document text
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4558b41a9d---fuvuk.pdfIn PDF document text
    • http://np-laser.com/upload_fck/file/2021-6-19/20210619183020180207.pdfIn PDF document text
    • https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/dq439a24ulnm7l1lrfvkkmbq8i/9252796347.pdfIn PDF document text
    • http://uzmansporzeminkaplama.com/resimler/files/55769680058.pdfIn PDF document text
    • http://amadpich.com/userfiles/file/vudarekebekivugunanotimon.pdfIn PDF document text
    • http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f263fd1c2c---59132281979.pdfIn PDF document text
    • http://busankid.com/webfiles/board/file///wapixapiwigir.pdfIn PDF document text
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/886c4ece64f2f2ce4579204338c68b79/31698127467.pdfIn PDF document text
    • http://tourister.kr/userfiles/file/gakejopig.pdfIn PDF document text
    • https://www.espaciocultivarte.com/ckfinder/userfiles/files/tosujilojenaba.pdfIn PDF document text
    • http://payassistinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d23ae0f18a---17917115486.pdfIn PDF document text
    • http://ggmtc.net/userfiles/files/dovaxebiketatagel.pdfIn PDF document text
    • http://matsonconstruction.net/userfiles/file/pusizaduwanofunemeg.pdfIn PDF document text
    • http://depcip.com/app/views/panel/ckfinder/userfiles/files/1960556841.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=guy+brousseau+theory+of+didactical+situations+in+mathematicsPDF 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_off0000ea25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA25 18232 bytes
SHA-256: 8f5262224c954b4504e1396f9e4c99d3ba4092bd2ef041df584c6a77d2067fcb
font_01_sfnt_off000118c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118C4 11136 bytes
SHA-256: 0f77920f26c172b18e1d0141ec0b0587f69ad4aafc77cc9bb4007048ea2023c3
font_02_sfnt_off00013299.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13299 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1