Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3520bd9be009cf9…

MALICIOUS

PDF

92.4 KB Created: 2021-08-28 19:25:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: fb7b8d1b437c44ec1e878fadec012306 SHA-1: 0a1745ba05772a7b41a5c516a685cee4bed19259 SHA-256: a3520bd9be009cf9931de900579d9f1f838f70037720874987be0feed837e7af
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

The PDF contains a large number of links, many of which point to compromised WordPress sites, indicating a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or distributing further malware. No scripts were extracted, and the document body was unreadable, limiting the analysis of the specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://www.chicagoalphas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070a421486e9---65333028945.pdf In PDF document text
    • http://www.festivalmarrakech.info/wp-content/plugins/formcraft/file-upload/server/content/files/160946bda8cbcd---sojakuvupufozami.pdfIn PDF document text
    • http://vmkmsz.hu/userfiles/file/3669389759.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e22430610ea---paberumemivewikil.pdfIn PDF document text
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a36ef1d00ba---volalev.pdfIn PDF document text
    • http://secretinvitation.net/images/files/wonuguri.pdfIn PDF document text
    • https://geya99.com/ckfinder/userfiles/files/kesuvu.pdfIn PDF document text
    • https://www.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1609d1adf1051c---wumasukikururinetokevoli.pdfIn PDF document text
    • https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/m2leapgtmk0eagqk2avtk4e1vs/givarelimokikonuvirugiver.pdfIn PDF document text
    • https://sunwayhk.com/louis/STARKGROUP/ckfinder/userfiles/files/77023338217.pdfIn PDF document text
    • https://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/415f3ad3b904707d04d8a59920b37668/xubebiwojeburitugavef.pdfIn PDF document text
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/44ff80e1cbc956f57d81bd684770b15e/43119229697.pdfIn PDF document text
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/aef08dda887243c75707a424c3847c93/69894007475.pdfIn PDF document text
    • https://stw-nowogard.pl/download/file/poxapinobulukix.pdfIn PDF document text
    • http://gayaarchi.com/userfiles/file/20210518155634.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610657106ecb6---6618632591.pdfIn PDF document text
    • http://www.moteco.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609014d3686ba---savame.pdfIn PDF document text
    • https://ntct.dz/ckfinder/userfiles/files/42611891423.pdfIn PDF document text
    • http://autoshiftbid.com/fckeditor/userfiles/file/1048658290.pdfIn PDF document text
    • https://faguaflowers.com/images/admin/file/99646777705.pdfIn PDF document text
    • http://profitoolinfo.ru/ckfinder/userfiles/files/4315841681.pdfIn PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16071d2661652d---nawufofa.pdfIn PDF document text
    • https://himalayanthailand.com/image/upload/File/bodipafixinowematelejigi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=how+old+is+the+rapper+rick+rossPDF 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_off0001033f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1033F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011b51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B51 18100 bytes
SHA-256: 787538220e090a95fcb73953f6f1ecd0ba009cee6c7c06dbc21624926ccf738f
font_02_sfnt_off00014a9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14A9A 10676 bytes
SHA-256: ef017ee4c924c8f96118aef6ed453ebc467d580c315f76d7409cb51e8d97cc81