Malicious PDF — malware analysis report

Static analysis result for SHA-256 5db917e8b64ccb0b…

MALICIOUS

PDF

79.9 KB Created: 2021-06-26 09:46:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 78480789307d5288dae49d5627bbd1fd SHA-1: a238b706e49c28ea3ed0cb5ff864003f93ad4aba SHA-256: 5db917e8b64ccb0be47a912d561c6805f2f05436f5942ab46cc6f4bb4bb61810
156 Risk Score

Malware Insights

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

The PDF contains numerous external URIs and link farms pointing to various domains, some of which are hosted on compromised WordPress installations. ClamAV detection and ML classification strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure suggests a lure to external malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://smidgel.ru/uplcv?utm_term=give+me+an+example+of+hypothesis
    • https://infravoip.com/wp-content/plugins/super-forms/uploads/php/files/f797596efc10630e5f16803794591c76/76902815224.pdf
    • http://casier-a-bouteilles.fr/file/10815763406.pdf
    • http://edwardfmcgintypa.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/56596265326.pdf
    • https://dynasty888.com/image/files/20210610_201117.pdf
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607fcea3c5344---6808005834.pdf
    • https://murtenhof.ch/userfiles/files/wobopugusugepu.pdf
    • http://ever-pioneer.com/upload/files/megerelojikejupafise.pdf
    • http://aimic.com/userfiles/file/rabegikuzagakuboxijifes.pdf
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b510e65d9e2---bujizezuxixarav.pdf
    • http://tropo-design.com/ckfinder/userfiles/files/12013804837.pdf
    • http://anhuishangbiao.com/upload_fck/file/2021-5-7/20210507112843779164.pdf
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b86383b4630---42141524536.pdf
    • https://kingdomofgodmn.org/userfiles/files/93950597200.pdf
    • http://blissworldbeauty.com/newerac2c/userfiles/file/89682410336.pdf
    • http://dulichtantai.com/files/uploaded/files/34001030935.pdf
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/6cdvt3gtiac972nql0p79tojog/45003682820.pdf
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/16075e82c1a1ed---66153825573.pdf
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/eqf5gtoqqma5vhk9n3mgtmblvr/85152784645.pdf
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/de42566j614uq6eujtmbiqkbe2/87809408076.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d76c.bin
6b47f505075f36cfb06529ee6dc3b079908454ef59001b3dda992367d5da69e6
pdf-font-stream PDF embedded font (sfnt) at offset 0xD76C 10844 bytes
font_01_sfnt_off0000f061.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF061 16792 bytes
font_02_sfnt_off00010873.bin
17687aad0bbca6be9028c17ee23db1e2ec5cb9eddfcbe407e435f52429040eab
pdf-font-stream PDF embedded font (sfnt) at offset 0x10873 16668 bytes