Malicious PDF — malware analysis report

Static analysis result for SHA-256 71e6f1e454044f22…

MALICIOUS

PDF

79.3 KB Created: 2021-06-29 04:19:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 8054a520d42fa7c37eeabf961fefe4fe SHA-1: 8c001727ebc2d641b6b115848f20415e50474041 SHA-256: 71e6f1e454044f22a63edd444fe746c4eb8a352b0b3fde91588d74397fea930c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous links pointing to compromised WordPress sites and disposable hosting, suggesting a link farm used for phishing or malware distribution. The presence of embedded URLs and the nature of the heuristics strongly suggest this PDF is designed to redirect users to malicious external sites, likely for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://coretry.ru/uplcv?utm_term=have+a+hunch PDF link annotation
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/gv1lkbgtgo2dj7j823l4mcb86s/runoruwugafelerifefozil.pdfIn PDF document text
    • http://asesorgubernamental.com/images/file/27209103471.pdfIn PDF document text
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/16076765550e23---zutejevufapajuninosi.pdfIn PDF document text
    • https://balance-global.com/wp-content/plugins/super-forms/uploads/php/files/0jg3sad9sic3jiijafsk264h5j/wawusuzumunavumiranaka.pdfIn PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d98b4ed969---46677485515.pdfIn PDF document text
    • http://passaicvalleyclassof1957.com/clients/44362/File/42402350220.pdfIn PDF document text
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b4a26d3ad34---bekugozu.pdfIn PDF document text
    • http://nesthomes.in/userfiles/file/83337177304.pdfIn PDF document text
    • https://www.skyline-recruiting.com/wp-content/plugins/super-forms/uploads/php/files/eac1f9df6c8c8e5eeefb67bba1aebce4/68337207397.pdfIn PDF document text
    • https://jollytime.ru/wp-content/plugins/super-forms/uploads/php/files/ff7bbbea9c4975952756e2048b56bd7a/mewusolupixesaxibamipup.pdfIn PDF document text
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/6652f1bab3f70b957ff0663977dc6b7d/79531539634.pdfIn PDF document text
    • http://www.sphotobooth.com/wp-content/plugins/formcraft/file-upload/server/content/files/160735731e918f---rofaritudugikubaxuxope.pdfIn PDF document text
    • http://www.telsercom.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d88ae75a0df---90309148663.pdfIn PDF document text
    • http://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/845095df27ba1813347c635fe690f272/fukimotuxubik.pdfIn PDF document text
    • https://angelsstaff.com/uploads/file/mifojibedadajubilasu.pdfIn PDF document text
    • https://andana.us/files/files/30216709623.pdfIn PDF document text
    • http://stolizstekla.ru/userfiles/file/56542354525.pdfIn PDF document text
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/bjpsp2k3rgiujg4icjvmcmsvdp/93280966902.pdfIn PDF document text
    • https://www.partyshuttlebus.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16082e132f12f7---60912755996.pdfIn PDF document text
    • https://lacecinella.com/writable/public/userfiles/file/putetizoxuwe.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_off0000c8fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8FA 26800 bytes
SHA-256: 534491d01bb29ec7e256309d9c0229940edbdf283410dd279ce5f4cbaf058f9a
font_01_sfnt_off000102e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102E8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011afe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AFE 9860 bytes
SHA-256: aa96f586564ed9eee491d1a28ce6ee097b8524152a708c23690276753d3cf0e7

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