Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f30fd19f6e00917…

MALICIOUS

PDF

83.1 KB Created: 2021-09-18 08:12:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 8b7bc729d50797875fe28d207dcd03d6 SHA-1: 4d000ad2e0e4751f8e4ae34db39080ac1b3f833d SHA-256: 1f30fd19f6e00917b7e10e677f4110bd87434545c6141beb30f3fea38cfab165
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identify it as a PDF link farm, with multiple URLs pointing to potentially compromised WordPress uploads and disposable hosting. The presence of a 'download button' lure further supports a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://archism.ru/uplcv?utm_term=i+need+temple+run PDF link annotation
    • http://abnigakgdsg.friendship-match.com/upload/files/12050758100.pdfIn PDF document text
    • https://ww150002.linebot.net/upfile/files/20210904211556.pdfIn PDF document text
    • https://inchirierielicopter.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161319adba3441---5907921824.pdfIn PDF document text
    • http://soeurs-scjboran.fr/soeurs/upload/files/wakis.pdfIn PDF document text
    • http://gitimohammadilakhimpur.org/ckfinder/userfiles/files/zesevu.pdfIn PDF document text
    • http://chunmianxian.com/upfolder/e/files/20210904060531.pdfIn PDF document text
    • http://akcihlar.cz/userfiles/file/jenutibomanuf.pdfIn PDF document text
    • http://fongyoskert.hu/userfiles/files/tavuv.pdfIn PDF document text
    • https://houstoncoinshow.org/FCKeditor/file/44907317522.pdfIn PDF document text
    • https://binarbaidrealestate.com/public_html/userfiles/file/toridoto.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138df378c493---narijufomemixuxu.pdfIn PDF document text
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/161337ae103ff2---dusosezi.pdfIn PDF document text
    • https://psfund.org/public/uploads/files/cms_files/mamakafiba.pdfIn PDF document text
    • http://alarm.pl/userfiles/file/46795706408.pdfIn PDF document text
    • https://www.willmarshelter.com/ckfinder/userfiles/files/29822384173.pdfIn PDF document text
    • https://hoangvan.vn/wp-content/uploads/files/zotefejusajiniro.pdfIn PDF document text
    • http://sartoriaventurini.com/userfiles/files/petegagala.pdfIn PDF document text
    • https://emotionalgift.com/ckfinder/userfiles/files/wasaropufukoji.pdfIn PDF document text
    • http://aromamahabaleshwar.com/ckfinder/userfiles/files/23114179086.pdfIn PDF document text
    • http://stressmanagement-karriere.de/userfiles/file/wajejasikazelo.pdfIn PDF document text
    • http://studioscoponi.eu/userfiles/files/32870804029.pdfIn PDF document text
    • http://kwiatmetal.pl/userfiles/file/xomuvejezafuxurilonabobew.pdfIn PDF document text
    • http://asdgolfclubtoscana.com/writable/public/userfiles/file/kusunivuziru.pdfIn PDF document text
    • https://www.kuwaitpolyurethane.com/ckfinder/userfiles/files/xanapanadedobetalikibojov.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_off0000e078.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE078 10064 bytes
SHA-256: 973313c98ccc8a98dc795f233ec0b0f2f2ed86cd067098b25507709a8baad401
font_01_sfnt_off0000f6c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6C2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010ed4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10ED4 18488 bytes
SHA-256: f4fcbb130058a94e94494e160b0847d3faf58a239abd302f430162430f871459