Malicious PDF — malware analysis report

Static analysis result for SHA-256 28adc3abf1c1ae35…

MALICIOUS

PDF

69.5 KB Created: 2021-09-18 23:44:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: c2a4622e7bb3241486fcc2046bd8f5bd SHA-1: 8bde8b46648164464a0593ab88f44ff5dcde4f61 SHA-256: 28adc3abf1c1ae35f692fc7f962b2b03ec8c54e3cce074ade578c5a88a831771
156 Risk Score

Malware Insights

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

The PDF file contains a large number of links to various websites, many of which appear to be compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of multiple external URIs and link farm heuristics points to a strategy of redirecting users to malicious content hosted elsewhere.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9868

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 https://wastran.ru/uplcv?utm_term=world+sports+streams+apk PDF link annotation
    • http://limobebe.com/userfiles/files/47109721312.pdfIn PDF document text
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142405b874b6---40806212787.pdfIn PDF document text
    • http://studiotrusso.it/userfiles/files/zasirejibufugakafef.pdfIn PDF document text
    • https://www.vigo.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1613e2780ec02f---jekubexawexebefajamasik.pdfIn PDF document text
    • http://studioindelicato.com/userfiles/files/73353853256.pdfIn PDF document text
    • https://premiersuli.hu/files/files/82094806985.pdfIn PDF document text
    • http://tid.vn/upload/files/71179318024.pdfIn PDF document text
    • https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/nrc9rhopc6bu5cn1u5kl62o0r9/kajomipado.pdfIn PDF document text
    • http://fine-trading-knotwork.com/uploads/media/joles.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/161319fabe546a---joparojevedosuf.pdfIn PDF document text
    • http://amirafouad.com/uploaded_files/file/18763442814.pdfIn PDF document text
    • https://www.piramideidiomas.com/ckfinder/userfiles/files/32780059658.pdfIn PDF document text
    • https://peoplehelppeople.net/uploads/File/nixamozemibovetitox.pdfIn PDF document text
    • http://rebornfair.com/FileData/ckfinder/files/20210915_B108DB3F05BB26B2.pdfIn PDF document text
    • http://trustycctv.com/ckfinder/userfiles/files/parosovof.pdfIn PDF document text
    • https://xtremefitksa.com/ckfinder/userfiles/files/76610677870.pdfIn PDF document text
    • https://fanaf.org/article_ressources/file/25218300755.pdfIn PDF document text
    • http://polesprogettazioni.com/userfiles/files/41382297674.pdfIn PDF document text
    • http://shinaval.ru/userfiles/file/mivepa.pdfIn PDF document text
    • https://giant-nano.com/app/webroot/userfiles/files/zanemavojajurejapivunudab.pdfIn PDF document text
    • http://sampoernastrategic.com/uploads/image/files/texofuweniwil.pdfIn PDF document text
    • http://gewoongroen.eu/app/webroot/files/userfiles/files/tifitobofemusajuvur.pdfIn PDF document text
    • https://menokatea.in/ckfinder/userfiles/files/32964529557.pdfIn PDF document text
    • http://wych123.com/upload/files/vedagilidoxeg.pdfIn PDF document text
    • http://cl-metalparts.com/d/files/sekewobebudovit.pdfIn PDF document text
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1612ee167c91be---7699379961.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_off0000b39c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB39C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cbb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBB3 10444 bytes
SHA-256: b7c3f31485a60b2221753e9053faf3cf73528d973f79f6cc59a2a1839de87ce1
font_02_sfnt_off0000e370.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE370 14820 bytes
SHA-256: 9dae40f94a3f8fd39c8c1641ba8ee5b8c1aff7cff89b2a2220998239299fa8ab