Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d7cec88a1074b9a…

MALICIOUS

PDF

86.9 KB Created: 2021-09-12 15:16:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 32f0fc0ce0f670c60060359d5263cc58 SHA-1: 80609d089be12d1a6651f3d462cd18ece8b71692 SHA-256: 6d7cec88a1074b9aedd185a5c085669107514054bd604304b39412157ca30edf
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to disposable hosting or compromised CMS upload directories, indicating a link farm designed to redirect users to potentially malicious sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. While no scripts were explicitly extracted, the nature of the links and the PDF structure align with common techniques for distributing second-stage payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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=lightroom+cc+apk+download PDF link annotation
    • http://ventensis.lt/public/ckfinder/userfiles/files/podalojajawun.pdfIn PDF document text
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613d0f223b818---34494775521.pdfIn PDF document text
    • http://konberdbio.com/upload/files/vigemosewevaxut.pdfIn PDF document text
    • https://fisheaglesafaris.net/pics/user/file/mixezelilududobakemunawof.pdfIn PDF document text
    • https://resicolor.com/upload/files/45021953679.pdfIn PDF document text
    • http://tai-yang.tw/taiyang/upload/file/sinewud.pdfIn PDF document text
    • https://inprovitecuador.com/ckfinder/userfiles/files/fubug.pdfIn PDF document text
    • https://clove7.com/userfiles/file/jujadegazemowibeval.pdfIn PDF document text
    • https://pmeds.us/userfiles/file/tedowepokewalu.pdfIn PDF document text
    • http://reginahajo.hu/_user/file/7174091218.pdfIn PDF document text
    • https://haps.company/wp-content/plugins/super-forms/uploads/php/files/e3d616230f98b9306e8b01bc04534b60/ritagedera.pdfIn PDF document text
    • http://centronegozi.com/public/zozobutepunamevupovut.pdfIn PDF document text
    • http://eska-lift.ru/userfiles/file/guwojinug.pdfIn PDF document text
    • http://dorapeyzaj.com/userfiles/file/63052796792.pdfIn PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/161326501b2d49---jozidunoraje.pdfIn PDF document text
    • http://landonintergroup.com/ckfinder/userfiles/files/wusumidepezodujefa.pdfIn PDF document text
    • https://yptea.com/data/fckeditor/files/79045492138.pdfIn PDF document text
    • https://wroclawmodelshow.pl/ckfinder/userfiles/files/pusonisodusidewusapis.pdfIn PDF document text
    • https://ural-aiti.ru/admin/ckfinder/userfiles/files/49655355929.pdfIn PDF document text
    • https://www.greenlakecruises.com/ckfinder/userfiles/files/buwofosekepibezivomu.pdfIn PDF document text
    • https://oriental-kitchens.com/userfiles/files/82174384677.pdfIn PDF document text
    • https://jdsliquorlocker.com/nbloom/fckuploads/file/gatagekan.pdfIn PDF document text
    • https://maria-galland.ru/files/file/fulonagufolisuguvigetaxix.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_off0000eb9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB9A 10796 bytes
SHA-256: 9d5c2bc0b90b307fe5ff121135f37a47966d2790a691eea3f16f88c50f6d90f6
font_01_sfnt_off0001041e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1041E 19088 bytes
SHA-256: a1d32a23e36e1ffde7e79dd62a8772497d072fcbf627768e4c8053e42c3a0531
font_02_sfnt_off000135ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135AB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1