Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8eae3a5e18e6236…

MALICIOUS

PDF

73.0 KB Created: 2021-09-21 07:00:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: f7fda9d6540fac2c9ea359be54603289 SHA-1: ce487b0916ec221213d893accc77d61aba771a87 SHA-256: f8eae3a5e18e623655498b2854b8ee957d69e3600bb2f970784cc0d9956faa30
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF file was flagged by multiple heuristics as a link farm, with many URLs pointing to potentially compromised websites or disposable hosting. The ML classifier and ClamAV also identified it as malicious, specifically a phishing trojan. The presence of numerous external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic strongly suggest the document's purpose is to redirect users to malicious sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://garglob.ru/uplcv?utm_term=moto+z2+force+update+android+9 PDF link annotation
    • http://hoanggiaphatland.com/uploads/image/files/vireginelorabagamogun.pdfIn PDF document text
    • http://dom-2000.ru/ckfinder/userfiles/files/gepofizuzizagimewozogat.pdfIn PDF document text
    • http://identik.hu/editor_up/70062095587.pdfIn PDF document text
    • https://linker.tw/files/79411809421.pdfIn PDF document text
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/27fd0dfb44502c3aec09fa8210680f3f/93191771916.pdfIn PDF document text
    • https://intrastorg.com/userfiles/file/pajaxigu.pdfIn PDF document text
    • http://turchifiltri.com/userfiles/files/pexinifanuzepawu.pdfIn PDF document text
    • http://mictrogiang.com/userfiles/files/vunuwibomepuj.pdfIn PDF document text
    • https://orig-shop-gsm.ro/ckfinder/userfiles/files/82135783812.pdfIn PDF document text
    • https://implant-drill.com/userfiles/file/63572921710.pdfIn PDF document text
    • http://manpukuorder.com/uploads/files/33238394973.pdfIn PDF document text
    • http://mitroc.com/userfiles/file/26139976778.pdfIn PDF document text
    • http://qianshunqs.com/admin/upload/xeniniwufometovuginazu.pdfIn PDF document text
    • https://firesystem.ro/imagini_ws/gupofatigige.pdfIn PDF document text
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/f007234531fde8e6dd300f0a93480d2f/mezizojagixewa.pdfIn PDF document text
    • https://tfsroanoke.com/home/tfs/public_html/new/ckfinder/userfiles/files/ximabilegujegegowa.pdfIn PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/161454b11079de---jurof.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144d13ce3691---62287387820.pdfIn PDF document text
    • http://archbot.pl/files/file/fatoniwamolajox.pdfIn PDF document text
    • http://sgyscom.com/upload_fck/file/2021-9-4/20210904022717645253.pdfIn PDF document text
    • http://onsijsselstein.nl/userfiles/files/24601596243.pdfIn PDF document text
    • http://jysfh.com/upload_fck/file/2021-9-7/20210907230223251808.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_off0000b9a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB9A0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d1b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1B2 16640 bytes
SHA-256: 0f7afa92b8f4381e70bfce829bcd2f9b4afa1164e1d28e65b600233d12cf34ce
font_02_sfnt_off0000fcb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCB7 10840 bytes
SHA-256: bc1443d3625eb800020d002adedfe6b28f50b072b6ca2f959b40c54f0fa66c56