Malicious PDF — malware analysis report

Static analysis result for SHA-256 272add0acfce5713…

MALICIOUS

PDF

80.2 KB Created: 2021-07-18 03:17:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: b505601e1284f861ac33fe236ab0039c SHA-1: f4a44a00a8d47ce571985aa7c97445fb808c8520 SHA-256: 272add0acfce5713680797de2db6e688b260024bb38544853fa0babd0afad615
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous links to external resources, many hosted on compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The presence of a 'download' button lure further supports a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://prikolnaya.com/wp-content/plugins/super-forms/uploads/php/files/62989130cbc22e4ede6e64efbfe8da21/74124544465.pdf In PDF document text
    • https://sckprime.com/wp-content/plugins/super-forms/uploads/php/files/6b21c175b0dd09bc2aad9ce12de7db22/16810441428.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/160c502d735d36---bizobisos.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c0584ed38b3---34963440875.pdfIn PDF document text
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/8c0edd7378028b9bbaee6532c389b695/dozajatafazevazatajivawa.pdfIn PDF document text
    • https://www.synergyheart2heart.team/wp-content/plugins/super-forms/uploads/php/files/6gqgt8e50qocbv42vn90lm9f02/danavudivawekaxewamoxomu.pdfIn PDF document text
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/uqtr8f14h1a8vuba7on2nbi7i2/46139718595.pdfIn PDF document text
    • http://hz-karavany.cz/ckfinder/userfiles/files/54692908339.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be1fdf1d852---17663822813.pdfIn PDF document text
    • https://laser123.com/geektic/files/kakesikumasu.pdfIn PDF document text
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c4947b48637---94778413912.pdfIn PDF document text
    • https://aaaxxion.info/images/file/tapadinofetelegukefotox.pdfIn PDF document text
    • https://www.azembay.com/wp-content/plugins/super-forms/uploads/php/files/cvbtgrejsc767kunhgt7eb6tfh/8751616324.pdfIn PDF document text
    • https://nevisnews.com/userfiles/fozuzut.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/16076caaa1c96f---gaduferoxekezul.pdfIn PDF document text
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7369998cc9---vowasudelinusajabovapo.pdfIn PDF document text
    • https://clifestyle.net/uploades/userfiles/file/xezani.pdfIn PDF document text
    • https://stop-remont.ru/ckfinder/userfiles/files/zetawevalejigivubinok.pdfIn PDF document text
    • https://www.sanier.pl/wp-content/plugins/super-forms/uploads/php/files/qur98e5i152bpj9p7akvh207kt/surijazanig.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ccc47ed66fa---vadugonopupurazukux.pdfIn PDF document text
    • https://martybermanassociates.com/wp-content/plugins/super-forms/uploads/php/files/c4d0da8e8e968912754464ce8e795d09/ziwalisumiloxu.pdfIn PDF document text
    • http://alibabashipping.com/userfiles/file/62886459085.pdfIn PDF document text
    • http://designerhouse.ru/upload/files/xamifanolu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=pdf+to+docx+converter+free+onlinePDF 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_off0000d86d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD86D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f084.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF084 10308 bytes
SHA-256: 1aaf353de3d29ae916be5ce4d090ca85d742b6f5311ff53c55eeb879ce0dafd6
font_02_sfnt_off000107d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107D6 16820 bytes
SHA-256: 0a1f5028b487686dc640a31a19473183586d5e18c7491fbb34076628d298c36d

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