Malicious PDF — malware analysis report

Static analysis result for SHA-256 060504c36498ae1b…

MALICIOUS

PDF

88.8 KB Created: 2021-08-06 23:24:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-03
MD5: cdc5ca0087261fa7fe2c8f5ccbe07be6 SHA-1: 40d67f6a06fa71119bf2f3accf65ef1bf67382ad SHA-256: 060504c36498ae1b342c6eeccbee4bc8dc06768feb52682e062eac72ccae2124
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file containing embedded JavaScript, which is a common technique for executing malicious code. It also features a large number of external URLs, many of which point to compromised websites or disposable hosting, suggesting a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://synowka.pl/galeria/file/54039271606.pdf In PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607bfde6d65e7---fesuxurapazogurav.pdfIn PDF document text
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080b606a3f32---bukejod.pdfIn PDF document text
    • https://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/db56173879bb51f411f5296c7fdba076/nivujeb.pdfIn PDF document text
    • https://binhruamuinanobac.com/wp-content/plugins/super-forms/uploads/php/files/rbf74raqa0gda6633qtqg64v6i/gezaba.pdfIn PDF document text
    • http://www.aceitunasdelguadalhorce.es/ckfinder/userfiles/files/bemogijabofanaja.pdfIn PDF document text
    • http://stlnsk.ru/uploads/file/zilopej.pdfIn PDF document text
    • https://laser-arena.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1607c37351f62e---genejajirimes.pdfIn PDF document text
    • https://www.kadeavenue.com/wp-content/plugins/super-forms/uploads/php/files/e21930dc9629318999a969271713d380/dubexorigegixiburi.pdfIn PDF document text
    • http://merwepizza.com/upload/file/48656783066.pdfIn PDF document text
    • http://nessie-vinylcare.com/file/vapetusumepapitoruxiwusex.pdfIn PDF document text
    • http://dossalas.com/wp-content/plugins/super-forms/uploads/php/files/98b9a8fd8ebc99d31ecb6de1dc905ba4/zabemofixejaguligul.pdfIn PDF document text
    • http://magendans.com/imagefiles/file/tipawepiza.pdfIn PDF document text
    • http://pho32shabu.com/uploads/files/41971783762.pdfIn PDF document text
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160a47c5263b46---sonozemexegi.pdfIn PDF document text
    • http://zs-g.jp/app/webroot/js/ckfinder/userfiles/files/dopitonekusafu.pdfIn PDF document text
    • http://koreanhotpot.com/uploads/files/76226124314.pdfIn PDF document text
    • http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/160729ccc758fd---fejajaxurizafosobevesated.pdfIn PDF document text
    • http://www.flamanville-76.fr/upload/file/jufotirexitubeporajafok.pdfIn PDF document text
    • https://bluebeakbranding.com/wp-content/plugins/super-forms/uploads/php/files/2011643b0702ea4a44dff784af72e88a/48873791827.pdfIn PDF document text
    • https://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/59457d51eb7796cdc3f4bab77aeb41a1/gerogobabubedebimufon.pdfIn PDF document text
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16107812fcf5e7---26730436673.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086e2dc8e3f8---rejotitukelaji.pdfIn PDF document text
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607681e04da43---43282200257.pdfIn PDF document text
    • https://okinawa4d.com/contents//files/2378689056.pdfIn PDF document text
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/ab301925fca158ca9fc83be9fc3a1f47/96009679033.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=how+do+i+write+a+business+proposal+for+a+salonPDF 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_off0000f62c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF62C 17052 bytes
SHA-256: 60ef453b7d5dd11ebf9a932074fe3c871e77f54919701b7da8354e9226b95d96
font_01_sfnt_off0001220c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1220C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013a23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A23 10808 bytes
SHA-256: cd9b5275de0db33cb5a95184143fa0c821446a32dd34fa7f99f03810f8ff3806

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