Malicious PDF — malware analysis report

Static analysis result for SHA-256 76954ef2ef8e7c5b…

MALICIOUS

PDF

91.7 KB Created: 2021-07-06 15:18:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: fdd6ffa3c60e75a7fe9a71335248e06f SHA-1: 49acf61e067109a95c03fc19269b6bcb2ec0a1ca SHA-256: 76954ef2ef8e7c5b3a04333287ce3c3d24a9275d83cb870b02998337236b2f28
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to potentially compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and link farm behavior are consistent with techniques used to deliver second-stage payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9932

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://infrive.ru/uplcv?utm_term=jack+frost+mimosa PDF link annotation
    • http://preserveproperties.com/userfiles/files/siwamonasulikokatotorunu.pdfIn PDF document text
    • http://highgaincomposites.com/img/file/20217694153.pdfIn PDF document text
    • http://nowator-zpu.pl/userfiles/file/belebonebabezag.pdfIn PDF document text
    • http://shinies.ru/img/lib/file/18241838541.pdfIn PDF document text
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b65e4556bad---xojibitetam.pdfIn PDF document text
    • http://dj-maily.com/uploads/pages/files/jujogibuxogadivepavupalif.pdfIn PDF document text
    • http://etcad.net/np/upfile/file/zejetokozu.pdfIn PDF document text
    • http://aromaonly1.com/yamituki-n/uploads/files/fonixa.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160a21441df6b7---fawusigevilokalusazuruxab.pdfIn PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1606f59dc93d35---33227088380.pdfIn PDF document text
    • http://gilendor.cz/userfiles/file/48759133290.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160bd7b4e7538e---46318658142.pdfIn PDF document text
    • https://www.clubmanizales.com.co/wp-content/plugins/formcraft/file-upload/server/content/files/16087d6129cdf4---18357303413.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/lasodufetuxebamabu.pdfIn PDF document text
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/160d8f8284d18e---dojowakufumuvavodogele.pdfIn PDF document text
    • https://at1-turbo-j3t.com/contents//files/49822085060.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c10790aeb00---6479479284.pdfIn PDF document text
    • http://berallebags.com/UploadFiles/FCKeditor/20210616004826.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094350d93f12---xetixusunowofulatawu.pdfIn PDF document text
    • http://asbufestival.com/uploads/FCK_files/file/79742465899.pdfIn PDF document text
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16087228a12378---naruvowavaneleduk.pdfIn PDF document text
    • https://vegas-shop.net/uploads/files/23609968890.pdfIn PDF document text
    • https://nscs.org/wp-content/plugins/super-forms/uploads/php/files/c305504c6e0c98ec85ef45ac8907708b/35261112162.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e7eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7EB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fffd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFFD 19484 bytes
SHA-256: 121060833ff43ddd4cf927fd6e0b2008136882b192c3f3799e25fec9bd1c61d3
font_02_sfnt_off00013257.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13257 10296 bytes
SHA-256: 6fe846b94d0e6395a63758af357633d531bcd827f5621dde5b0182eb53bdf8fb
font_03_sfnt_off000149a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x149A3 16312 bytes
SHA-256: 7d15b2d6d265aaca51dda18faee70a1b8fa9d95ed54cb111fb0895789092f9ae