Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4eae04c948d5a78…

MALICIOUS

PDF

102.7 KB Created: 2021-08-25 20:01:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 951ae8232056c00731c492cf54f70d0b SHA-1: 4bc1e94907ddf212c7043adad308db06b0b8c01b SHA-256: a4eae04c948d5a78e001929f6f2e4222f2e2ec69a4e019dc2ea48bbea118f729
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, containing numerous URLs pointing to external sites, some hosted on compromised WordPress installations. This pattern suggests the document is designed to lure users to potentially malicious or phishing websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9834

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://pixomot.ru/uplcv?utm_term=the+meaning+of+optimise PDF link annotation
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607335472ce2e---32678977487.pdfIn PDF document text
    • http://badgerhillfarm.uk/vigez.pdfIn PDF document text
    • https://asthasupermarket.com/userfiles/file/67413194799.pdfIn PDF document text
    • http://swvocal.com/data/se2/file/81312875859.pdfIn PDF document text
    • https://www.criteriainvest.com.br/wp-content/plugins/super-forms/uploads/php/files/c2n854egn6u6hoe4fi36i3bkq1/23860178541.pdfIn PDF document text
    • https://greenfuturevietnam.com/Upload/files/26515630354.pdfIn PDF document text
    • https://avela.md/userfiles/file/38646137259.pdfIn PDF document text
    • https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d85a8b5fe2---97466848743.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb4ae2611c---pizurezudaxofa.pdfIn PDF document text
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609eda2b9c346---ruvoserew.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8d972a254---legebolodiwaludemukegax.pdfIn PDF document text
    • http://vakantie-noordlimburg.nl/ckfinder/userfiles/files/23876773903.pdfIn PDF document text
    • http://qca.ch/userfiles/file/62061426227.pdfIn PDF document text
    • https://fibra-optica.ro/ckfinder/userfiles/files/xemozuwurokazuxijaru.pdfIn PDF document text
    • https://msr-hudsonproperties.com/wp-content/plugins/super-forms/uploads/php/files/e96ad4305a767d8b930965721760f026/13524081280.pdfIn PDF document text
    • https://flexrocksrollovers.com/wp-content/plugins/super-forms/uploads/php/files/jmfufo77nrrrh68qudemr1srtk/39298805641.pdfIn PDF document text
    • https://audreyheselmans.com/_files/file/54756472792.pdfIn PDF document text
    • http://cupta.org/userfiles/files/20210815135033.pdfIn PDF document text
    • https://menokatea.com/ckfinder/userfiles/files/nipuvagotakipuru.pdfIn PDF document text
    • https://fiambreszav.com/wp-content/plugins/super-forms/uploads/php/files/8b5de7dbe64c6668686b72ed4d68f9c5/56383050666.pdfIn PDF document text
    • http://zulassung4you.de/bilder/file/59001299211.pdfIn PDF document text
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160974f2fbf85e---8653025223.pdfIn PDF document text
    • https://groupburuemas2.com/contents//files/rojenuvexaralazosuvixufar.pdfIn PDF document text
    • http://www.umadai.com/ckfinder/userfiles/files/rogomorumojotelop.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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off00013247.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x13247 27884 bytes
SHA-256: 31cdde1af00b8ac9e184ae5d2462f5430423496b489dd401498d1d6a161d2745
font_00_sfnt_off0000dd86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD86 24184 bytes
SHA-256: f9ebca577a691f6e1766c1de416d7e22c5afd9054b554197540b02fd87ec7df6
font_01_sfnt_off00011a32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A32 10620 bytes
SHA-256: 1d20e4d2dbb5a1fddc2aa13de42732df72ef9ea4503f86ea0249e5727ef7ef05
font_03_sfnt_off00016567.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16567 3464 bytes
SHA-256: a8161c2f5ba9235eb51b4fcc43b6bb219725019365cb8d38f9ec25dfe5ce54ff
font_04_sfnt_off000172e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x172E6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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