Malicious PDF — malware analysis report

Static analysis result for SHA-256 821ae40c81f3842e…

MALICIOUS

PDF

120.8 KB Created: 2021-08-11 16:22:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 0e11d65cca7a7dfcd50de6f42dc322f5 SHA-1: ccefee8b0fbdc15833b3a8047933ede99f7c3e24 SHA-256: 821ae40c81f3842ef7bf378776139fff074daf49cf409e265d85e7e3d998a27d
176 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to various domains, many of which appear to be compromised WordPress sites or disposable hosting. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware delivery. The presence of external URIs and link farms suggests an attempt to redirect the user to a malicious payload or phishing page.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://drafthe.ru/uplcv?utm_term=marie+clay+running+record PDF link annotation
    • https://tenfci.org/userfiles/file/93340860686.pdfIn PDF document text
    • https://hmanagement.net/userfiles/file/25150264931.pdfIn PDF document text
    • http://afghansolar.com/userfiles/file/26619532935.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/976i0nqmfk5up2ck9n3gb762u1/151403456.pdfIn PDF document text
    • http://pluimveebeurs.com/userfiles/file/84530023595.pdfIn PDF document text
    • https://stcc-sa.com/motakamel/Ups/files/14625611722.pdfIn PDF document text
    • https://ijmscr.com/ckfinder/userfiles/files/solab.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c34613811b9---24678473649.pdfIn PDF document text
    • https://atkarisuli.hu/userfiles/file/dofodezu.pdfIn PDF document text
    • http://autoneza.cz/UserFiles/File/59964969866.pdfIn PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609e4b1b63c45---wiwilozevagaxexevodovag.pdfIn PDF document text
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/16112f60ab31c1---gunoxinozojadilewowanuvu.pdfPDF link annotation
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/1609891c016af3---lugaraf.pdfIn PDF document text
    • https://lokmangal.co.in/wp-content/plugins/super-forms/uploads/php/files/189d8d36aea2c560b5c3130a9e65510f/75974898962.pdfIn PDF document text
    • http://phamtrangia.com/upload/files/limulujux.pdfIn PDF document text
    • http://forumcutuca.com/ckfinder/userfiles/files/zutimobinubew.pdfIn PDF document text
    • http://villaturri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a38df54d740---sugetevunizidef.pdfIn PDF document text
    • http://e-hematologica.com/users//file/xexelugukenifiwij.pdfIn PDF document text
    • http://robertoantoniz.com/resources/original/file/pirewop.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dfd1ab9ac4f---32393012568.pdfIn PDF document text
    • https://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/tm124ho4puuds2gapad5vo4m81/99811957351.pdfIn PDF document text
    • http://ebslang.net/_UploadFile/Images/file/bobedumovezemokurep.pdfIn PDF document text
    • http://www.ez4parcel.net/upfile/files/2021/06/29/sovatoxibiwewojefuf.pdfIn PDF document text
    • http://phdpecs.hu/userfiles/files/pixijuvalazotuniva.pdfIn PDF document text
    • https://www.infratechgroep.nl/wp-content/plugins/super-forms/uploads/php/files/dbb3be5c7ffbda81da24dc5dd750db7b/lurulepewevumepidu.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_off00017468.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17468 18520 bytes
SHA-256: bb4e69198b37c3fd99e6508e22f7853c5437d04a7cc420271388d13e23cdfa93
font_01_sfnt_off0001a526.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A526 10484 bytes
SHA-256: 390080064b1e1d940f0bbe1123a0e619eb3efde25a0c99803659f3de1e1c2be3
font_02_sfnt_off0001bcde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BCDE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.