Malicious PDF — malware analysis report

Static analysis result for SHA-256 afc6623655fe873c…

MALICIOUS

PDF

84.8 KB Created: 2021-09-01 11:52:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 2b7c079d8f4ac9717dce22558a14bf4a SHA-1: b77911ad6fb2f053f3078b07d13587f6b5c830ff SHA-256: afc6623655fe873cbc98f311dc9b2ed5ee9008a8b8274b16fe2fea4dd10790df
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier. Heuristics indicate it functions as a link farm, pointing to multiple compromised WordPress upload directories. The URLs suggest an attempt to host malicious PDFs or redirect users to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

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://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16081fa65c057e---torigemegiwopugoxebowe.pdf In PDF document text
    • https://cal.lighting/wp-content/plugins/super-forms/uploads/php/files/6622991d28d1aba9e263b30a9fde7bae/vevirifirofututug.pdfIn PDF document text
    • http://devison-matras.com/upload/file/60537205588.pdfIn PDF document text
    • https://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/17j5a36svnm4q3flqp8bhu3lu1/31537151523.pdfIn PDF document text
    • https://fiscalonline.ro/app/webroot/files/userfiles/files/zogigopukiliwedilepema.pdfIn PDF document text
    • http://e-park.es/img/uploads/files/80513543423.pdfIn PDF document text
    • http://bahattinburyan.com/userfiles/file/46516778510.pdfIn PDF document text
    • http://kovacsoltvaskerites.hu/images/file/31427457478.pdfIn PDF document text
    • https://ensasoft.com.tr/wp-content/plugins/super-forms/uploads/php/files/kogpv56vafc45g1ii4161f9rcd/rimabamejagivosi.pdfIn PDF document text
    • http://architects-desk.com/uploadsfile/59859975438.pdfIn PDF document text
    • http://darec.sk/files/files/wowomo.pdfIn PDF document text
    • http://sbsinternationalschool.org/sbsisnew/userfiles/file/nigozezejamufu.pdfIn PDF document text
    • https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160ac0e618288e---bosufotoxuzigarake.pdfIn PDF document text
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1609586c4dc1f0---sezigizibawatadafuzete.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/75f2f9d9cffc69b937171bb95b676a0b/42097248049.pdfIn PDF document text
    • http://polkovnik.su/upload/file/zuzeteserutanexuvuk.pdfIn PDF document text
    • https://estigotours.com/wp-content/plugins/super-forms/uploads/php/files/9712b0dd88379e1049d3d79dbd9d804b/47061806151.pdfIn PDF document text
    • http://massimobertoarchitetto.com/userfiles/files/41535862914.pdfIn PDF document text
    • https://www.notusweb.com.br/ckeditor/ckfinder/userfiles/files/74326061943.pdfIn PDF document text
    • http://iccj.jp/images/uploads/fckeditor/file/84344555592.pdfIn PDF document text
    • https://www.techsrollout.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087fb15c7fed---8310722120.pdfIn PDF document text
    • https://immobilgold.com/file/874642862.pdfIn PDF document text
    • http://sosnovgeo.ru/userfiles/file/wadomalixa.pdfIn PDF document text
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160870116d7b1c---zubudunez.pdfIn PDF document text
    • https://lokmangal.co.in/wp-content/plugins/super-forms/uploads/php/files/0ef020d2ad525c2cf0c45d203ae776d3/3422589164.pdfIn PDF document text
    • https://rotherelectric.com/files/kezodoranet.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=and+you+got+me+like+ooh+what+you+want+from+mePDF 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_off0000e4c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4C2 11008 bytes
SHA-256: 88f0da5e49f80bcdfab44c00abac344666338dcd43f17a5cd72632d160ae622a
font_01_sfnt_off0000fdf7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDF7 17996 bytes
SHA-256: 338ae7ed406ec0c95a6f64bf700520a9780d3876aea3f1920cde973d53d0f7f8
font_02_sfnt_off00012ca0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CA0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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