Malicious PDF — malware analysis report

Static analysis result for SHA-256 768b7e627553ef35…

MALICIOUS

PDF

82.2 KB Created: 2021-09-21 01:20:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 3c93e8987eb1ae574ed23991ebf98849 SHA-1: 41fd65d76fe080e0157dfd97bd14dd5648d65a09 SHA-256: 768b7e627553ef35aa9463663fcd24d5fae59768656d370c77bffac9dffc52ce
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with many URLs pointing to compromised WordPress uploads and disposable hosting, suggesting an attempt to distribute or mask malicious content. The presence of external URIs and a link farm heuristic strongly suggests the document is designed to redirect users to malicious sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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 http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16147369d8777b---muforumepabofuwik.pdf In PDF document text
    • http://www.texaco.bargiel.com.pl/ckfinder/userfiles/files/nafanapebikagigip.pdfIn PDF document text
    • http://salman-is.com/userfiles/file/99567319378.pdfIn PDF document text
    • http://decorstore.eu/upload/file/14235389780.pdfIn PDF document text
    • http://kdwatch.net/upload/files/2021091210474623.pdfIn PDF document text
    • https://munis-roquesalbes.cat/demo/vilalba/imatges/file/lizetoramira.pdfIn PDF document text
    • http://cmuniontravel.com/userfiles/file/87494938036.pdfIn PDF document text
    • http://cn-biyoute.com/d/files/508565063.pdfIn PDF document text
    • http://mishor-uvk.com/uploads/files/52509831727.pdfIn PDF document text
    • http://hakanhurdacilik.com/userfiles/file/93951142586.pdfIn PDF document text
    • http://portalinmobiliario24.com/uploades/fckeditorfile/jaguredufosusese.pdfIn PDF document text
    • http://nanumed.ro/uploads/files/sixex.pdfIn PDF document text
    • https://zazilha.com.mx/wp-content/plugins/super-forms/uploads/php/files/82cfd665576c795e7143ee91e6f4af3a/66250630055.pdfIn PDF document text
    • http://dubilex.com/userfiles/files/witebimajivenopibaw.pdfIn PDF document text
    • http://marjoleintje.nl/include/userfiles/neges.pdfIn PDF document text
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/16146c1bbefc51---taxim.pdfIn PDF document text
    • http://turnwealthy.com/ckfinder/userfiles/files/9481231802.pdfIn PDF document text
    • http://newdimension.su/userfiles/file/43466055298.pdfIn PDF document text
    • http://elfast.ru/userfiles/file/bujeninubamixosufudi.pdfIn PDF document text
    • http://kleinschadenexperte.de/userfiles/file/pawasetaxo.pdfIn PDF document text
    • http://www.laterveer-biesenbeek.nl/ckfinder/userfiles/files/53146438919.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=malayalam+movies+free+download+sitesPDF 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_off0000dda3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDA3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f5ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5BA 10776 bytes
SHA-256: a511e4b7c08889b256031213a42d7e8d83691abab6c641e7ec82a1a016e40afa
font_02_sfnt_off00010e98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E98 17224 bytes
SHA-256: 9b46de4e94f39fe876f3562957c8bd15e39e8bd1c15239ef10d2ce3aa62254a2