Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b7b80e54a12d38b…

MALICIOUS

PDF

88.4 KB Created: 2021-08-19 05:25:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 0b82f1a0a3cd6ed608690fa954edbf88 SHA-1: 3df109425e36763da0540b2e8d548ac101306164 SHA-256: 8b7b80e54a12d38b0dcc74c14eb6a667c264f198350318caff77385786269032
156 Risk Score

Malware Insights

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

The file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to redirect users to malicious sites. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a non-clustered link farm on disposable hosting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 http://el-master.ru/userfiles/file/guxotagiwuvaba.pdf In PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/f47967957a7873c61f8a339d79750196/38130181870.pdfIn PDF document text
    • https://www.lightingsolutionsinc.net/wp-content/plugins/super-forms/uploads/php/files/0efc1d27880d506b7963b27e807f3634/rilulosugazuripo.pdfIn PDF document text
    • https://nvsrolko.org/ckfinder/userfiles/files/pevax.pdfIn PDF document text
    • https://harrisitalia.it/uploads/file/71890633718.pdfIn PDF document text
    • https://sanvexe.vn/webroot/img/files/60145176598.pdfIn PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cc9a6452e0c---26965726866.pdfIn PDF document text
    • https://jdlpartnerss.com/userfiles/file/pisujeropifelijaboni.pdfIn PDF document text
    • https://gtsonline.nl/wp-content/plugins/super-forms/uploads/php/files/ah5ialpr6jiuauedmbj9ei2b3n/waxelovatojonijef.pdfIn PDF document text
    • https://dm288.rs/slicice/file/25865504512.pdfIn PDF document text
    • https://www.ptlittleflower.org/wp-content/plugins/super-forms/uploads/php/files/v1bud8bktco10lbh6kol7am22a/41854017653.pdfIn PDF document text
    • https://agrilaui.com/userfiles/file/37097311203.pdfIn PDF document text
    • http://intersonik.eu/upload/files/94969416789.pdfIn PDF document text
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c11840eab8---99875109361.pdfIn PDF document text
    • http://cn-polylysine.com/d/files/zekufifit.pdfIn PDF document text
    • http://marcth.pl/media/fck/file/lixopuvojoxefabilobotole.pdfIn PDF document text
    • http://kag.fr/userfiles/file/26878135352.pdfIn PDF document text
    • https://dazzlin.co.uk/wp-content/plugins/super-forms/uploads/php/files/0225e0e4ab52b6a89d99e25bb2395300/62881185438.pdfIn PDF document text
    • https://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/f404268369e88c3b7d8c913c1208c36e/kupiwademosebazom.pdfIn PDF document text
    • http://meyanko.com/userfiles/file///2085905184.pdfIn PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/160acdd5a58578---lukegirena.pdfIn PDF document text
    • http://abc-tel.ru/data/File/43103679689.pdfIn PDF document text
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606c85f591783---nuvawaf.pdfIn PDF document text
    • https://bdata.vn/upload/files/85515969739.pdfIn PDF document text
    • https://sckprime.com/wp-content/plugins/super-forms/uploads/php/files/19eef6ba08e8596e0486c2d4fb848682/21828432940.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=dancing+at+lughnasa+ending+monologuesPDF 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_off0000f784.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF784 10816 bytes
SHA-256: 6b32a5c31aec524b5a33e8a4868548c3213b9fb8220fa2085aee8488441292f2
font_01_sfnt_off0001101c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1101C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001282e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1282E 16744 bytes
SHA-256: c4485b1ea35ecb10035ec9e12957c31cc1bcfa3aa5468394b64f51d9510f885a