Malicious PDF — malware analysis report

Static analysis result for SHA-256 883cffea1252c431…

MALICIOUS

PDF

90.9 KB Created: 2021-09-09 23:13:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: d9a44a3977659702fbead3f478705180 SHA-1: 61a17a11ccbc9de38366695ea98477e132f5ff1e SHA-256: 883cffea1252c4310ee922d834e262748490a057e461c872b6b72e8f0e8bd39f
164 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites and disposable hosting, forming a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is a common technique for exploiting PDF vulnerabilities to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9932

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://piauiaqui.com/ckfinder/files/futiwasogan.pdf In PDF document text
    • https://stdtekstil.com/upload/ckfinder/files/84881006755.pdfIn PDF document text
    • https://maintogelonline2.org/contents/files/5492495622.pdfIn PDF document text
    • http://slkuang.com/v15/Upload/file/2021941943134569.pdfIn PDF document text
    • https://bcm.es/files/galeria/files/73777418987.pdfIn PDF document text
    • http://gemwishrs.com/ckfinder/stones/files/jibijesosebenaxu.pdfIn PDF document text
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1613674dba51ef---72484188037.pdfIn PDF document text
    • http://kidsjeodo.com/images/files/7316289022.pdfIn PDF document text
    • https://www.passion-rnd.com/upfile/files/2021/09/09/wewofi.pdfIn PDF document text
    • https://eventaipei.com/upload/files/lawumatat.pdfIn PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a159abb9f6---63825310004.pdfIn PDF document text
    • https://mps-india.com/userfiles/files/lesawigoselijapibepafala.pdfIn PDF document text
    • https://best-of-geldanlagen.de/userfiles/file/gubutawejiwowig.pdfIn PDF document text
    • https://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/9e7a9deb9943924ade688c9c15cb7d92/mefibutipeve.pdfIn PDF document text
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fef20a7fc2---falazuwefazataf.pdfIn PDF document text
    • https://szaniterplaza.hu/ckfinder/userfiles/files/24861714969.pdfIn PDF document text
    • http://terredellamagnagrecia.com/userfiles/files/56066246681.pdfIn PDF document text
    • http://tutek.eu/userfiles/file/guxabigupunedomixezozudi.pdfIn PDF document text
    • http://orenprom.com/img/account/file/95218781320.pdfIn PDF document text
    • http://firsttimehomebuyerstudy.com/images/file/76754863108.pdfIn PDF document text
    • https://durgabas.coop.np/ckfinder/userfiles/files/japojodofodoj.pdfIn PDF document text
    • https://www.scmsgroup.org/ckfinder/userfiles/files/36359677170.pdfIn PDF document text
    • http://perechen-izdaniy.ru/js/ckfinder/userfiles/files/31170448398.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=hacksaw+ridge+streaming+vostfrPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e1a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1A5 11008 bytes
SHA-256: 9ece8864ae2afc5afed6e531e8896610af34ad0aefa707365e3d1031ee87bbe9
font_01_sfnt_off0000fb16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB16 16160 bytes
SHA-256: fa5cbea137587b1d4bb1c548ff3f8d17a18587fe273de630a8d80f12e69f99e4
font_02_sfnt_off000110ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110AD 20404 bytes
SHA-256: d108a9f2e02b5abe32edbc2f8a8111f44b01aca6b3ebfa8c1f1957069fe26c9f
font_03_sfnt_off000145a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x145A0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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