Malicious PDF — malware analysis report

Static analysis result for SHA-256 0593b3088f9549fb…

MALICIOUS

PDF

79.9 KB Created: 2021-07-16 08:57:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 1c036fee8444d4dc4ec2e0f5353e218c SHA-1: 8fb9d2a12e6d7b5a75f8379cc25065c7ed47c4eb SHA-256: 0593b3088f9549fbfb25e7dc41a7d14ed61beedf9fc3ee6fce59ea9f3b468e3b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to compromised WordPress sites and other disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. While no scripts were explicitly extracted, the nature of the URLs and the PDF structure suggest it's intended to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://chcial.ru/uplcv?utm_term=total+dissolved+solids+procedure+pdf PDF link annotation
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160bf192394b46---saduxofakesirozovolasodu.pdfIn PDF document text
    • https://singaporeroadshow.com/wp-content/plugins/super-forms/uploads/php/files/37a0ba1dd6b44e5d787c7d6a0c70642e/monovirakoxuvipedelunebim.pdfIn PDF document text
    • https://fiscalonline.eu/app/webroot/files/userfiles/files/sijigamevokeded.pdfIn PDF document text
    • http://clair-environnement.eu/catalogue_dynamique/file/57892380613.pdfIn PDF document text
    • http://austria-ex.com/images/blog//file/78677158114.pdfIn PDF document text
    • https://neavocats.com/wp-content/plugins/super-forms/uploads/php/files/3b2a0d7166cda6239ce55e076bce9d1b/56393649224.pdfIn PDF document text
    • https://audreyheselmans.com/_files/file/7204102627.pdfIn PDF document text
    • http://bfr-bialapodlaska.pl/userfiles/file/38992013353.pdfIn PDF document text
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/2ee0d0f01d3321136108ef77683add08/72069746329.pdfIn PDF document text
    • http://associazionemillesogni.it/userfiles/files/19372373885.pdfIn PDF document text
    • http://aquamedia.cn/ckfinder/userfiles/files/legosewupadafojevim.pdfIn PDF document text
    • https://qian-ho.com/upfiles/editor/files/50029349749.pdfIn PDF document text
    • http://sequirk.ie/userfiles/file/zanebizudamususaboli.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c585d0c5fd1---4529613712.pdfIn PDF document text
    • https://adtw1.com/ckfinder/userfiles/files/fitomibasab.pdfIn PDF document text
    • http://razaviota.ir/basefile/razaviotair/files/46238023719.pdfIn PDF document text
    • https://refour.dk/wp-content/plugins/super-forms/uploads/php/files/5782d6afdc1c87e789ad335609ff1d96/butegikaneraxokapipoz.pdfIn PDF document text
    • http://ebrinteractive.com/userfiles/file/ruwaxawu.pdfIn PDF document text
    • http://slp70.com/clients/873855/File/judagonajozanag.pdfIn PDF document text
    • http://abwessex.com/uploads/files/17230180607.pdfIn PDF document text
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16079d47d2dda5---soxupukix.pdfIn PDF document text
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/203df653008c9c62c4834d36c7f16996/vamobopiboto.pdfIn PDF document text
    • https://ifacemount.com/wp-content/plugins/super-forms/uploads/php/files/26lt7hepg033itvofj4muh99se/97172283314.pdfIn PDF document text
    • http://irodori.kir.jp/files/file/80316501546.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_off0000d70a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD70A 10636 bytes
SHA-256: 30f83e314bd153c26a939e2c50d05c5742be1ce9e4638c583fd1c6f2f6d8486b
font_01_sfnt_off0000ef8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF8C 16464 bytes
SHA-256: 8a8aa6484ad218ccfe90c1ff306fd537921626c2c427528db34f21edd9823c4b
font_02_sfnt_off00011a1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A1B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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