Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ac9a9785ba79985…

MALICIOUS

PDF

94.8 KB Created: 2021-08-15 17:51:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 35e1e3ab6753b62fad9a9bc18838dbe3 SHA-1: 4ce5f1441cd1287f303b57b7d28259d7d76173b8 SHA-256: 4ac9a9785ba79985660dfabe5941869db59296f3e06f6c71e711cd173f71c0df
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9761

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://aj-logistics.com/stock/userfiles/file/52352089897.pdf In PDF document text
    • http://bamt.be/wp-content/plugins/formcraft/file-upload/server/content/files/16077c8594b73a---93728987496.pdfIn PDF document text
    • http://okun.su/upload/file/8059799778.pdfIn PDF document text
    • http://www.bash.cl/media/file/nenivixuburuvadamiba.pdfIn PDF document text
    • https://burgaseguros.com/userfiles/file/wodubumelet.pdfIn PDF document text
    • http://gitimohammadilakhimpur.org/ckfinder/userfiles/files/93140250152.pdfIn PDF document text
    • https://camping-du-lac-dijon.com/fichiers/pavibizafurukiwizu.pdfIn PDF document text
    • https://kfz-gutachter-oliver-schiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a4bd6768929---74306395861.pdfIn PDF document text
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160bc00b481377---31469700750.pdfIn PDF document text
    • https://www.jakketoes.be/ckfinder/userfiles/files/69463331591.pdfIn PDF document text
    • https://traveltokiev.com/wp-content/plugins/super-forms/uploads/php/files/70koksak0ubdm9u2nk5q88kma1/nizujozudos.pdfIn PDF document text
    • http://ssaisarang.com/ckfinder/userfiles/files/78556543909.pdfIn PDF document text
    • http://elementsgogreen.com/userfiles/file/bixuramisigere.pdfIn PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606caf3c3ba70---72169551446.pdfIn PDF document text
    • http://mega.kz/media/upload/files/51204463827.pdfIn PDF document text
    • http://kanchanaspa.com/ckfinder/userfiles/files/bitumegamot.pdfIn PDF document text
    • https://www.blackandwhite-salon.com/wp-content/plugins/super-forms/uploads/php/files/6694b922f441177429eb679cee48999c/bididebuna.pdfIn PDF document text
    • http://shmountaineering.co.uk/wp-content/plugins/super-forms/uploads/php/files/7vprdl2d7srolmoqpbj8fuj8n5/96445065804.pdfIn PDF document text
    • https://www.zaantraining.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b6309d381fe---giwawuligitula.pdfIn PDF document text
    • http://safarekhoob.ir/basefile/safarekhoobir/files/kidoluwevotusizakunagi.pdfIn PDF document text
    • http://maschimaurizio.it/userfiles/files/nusikigeraja.pdfIn PDF document text
    • https://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160fa7b6bdece4---xalib.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082df57c1f0d---97643253819.pdfIn PDF document text
    • http://xn----9sbkvfu2aex3d.xn--p1ai/ckfinder/userfiles/files/55671684164.pdfIn PDF document text
    • https://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/25d38dcc42d56178613c73c5202c76e1/gawagafetegoruzem.pdfIn PDF document text
    • https://equantumconsulting.com/files/files/sidokuperuge.pdfIn PDF document text
    • https://antoinepanau.com/wp-content/plugins/super-forms/uploads/php/files/cef5e000d466f64b7270345022a6e787/sozonubebowajax.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=manual+de+maquina+de+coser+toyota+eco+15+cbPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f33b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF33B 11208 bytes
SHA-256: b476bae5b82ef7cbc3bdd0ac55c8bc6be45a7666b0454e4cf0c7aac824d382d4
font_01_sfnt_off00010d4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D4F 18980 bytes
SHA-256: 08f20ad53c3ac90261217da84ed1d97229fdfaa8bcf044a4f92fc6d58fe1c582
font_02_sfnt_off00013c93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C93 16312 bytes
SHA-256: 7d15b2d6d265aaca51dda18faee70a1b8fa9d95ed54cb111fb0895789092f9ae
font_03_sfnt_off0001529e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1529E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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