Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d872c67b4c52edc…

MALICIOUS

PDF

83.7 KB Created: 2021-09-21 01:34:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: b93d75835728692bc099f97bff70a1f7 SHA-1: 953f3460ea3d44402a1d3f020c1ae2715a254064 SHA-256: 9d872c67b4c52edc992f8010e4e5cec4d520491ef9df480fc3275f3758333479
164 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 or disposable hosting. Heuristics indicate this is a link farm designed to redirect users, with one URL specifically mentioning 'autokit app apk', suggesting a potential lure for malicious applications. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://pistant.ru/uplcv?utm_term=autokit+app+apk PDF link annotation
    • http://king-tableware.com/uploads/files/202109140531583472.pdfIn PDF document text
    • http://bafiti.com/sklep/userfiles/file/tazedovomopefitakerowa.pdfIn PDF document text
    • http://sushiyaslo.com/uploads/files/14225983710.pdfIn PDF document text
    • https://nolimitscenter.be/peausitive/images/FCKeditor/file/fuzowosezojuzakixepape.pdfIn PDF document text
    • http://koryosushi.com/uploads/files/vesazodapebirewepu.pdfIn PDF document text
    • http://conganbacgiang.vn/app/webroot/uploads/files/morafenov.pdfIn PDF document text
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/1613e2f6aa3710---78732649390.pdfIn PDF document text
    • https://sensiblemachines.com/ckfinder/core/connector/php/files/86721390764.pdfIn PDF document text
    • https://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/afc400eb9a5d7d1d4a10d50809734c73/64320976425.pdfIn PDF document text
    • http://gourmethousemacau.com/UploadFilesfile///ribepawovonawaxasuk.pdfIn PDF document text
    • https://pvesc.vn/uploaded/file/nifokafewimopigotesurikom.pdfIn PDF document text
    • http://thestarbusan.com/FileData/ckfinder/files/20210921_FB95F947B2E5C8E5.pdfIn PDF document text
    • https://coastalholidayproperty.com/ckfinder/userfiles/files/9212785939.pdfIn PDF document text
    • http://salt17.com/userfiles/files/7789086875.pdfIn PDF document text
    • http://casavacanzesanvito.eu/userfiles/files/872347935.pdfIn PDF document text
    • http://www.fashiongale.ro/userfiles/files/14120231859.pdfIn PDF document text
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/161409691b20af---tigigidoxemowijupizux.pdfIn PDF document text
    • http://makassitools.com/userfiles/file///91369969205.pdfIn PDF document text
    • http://joy05.com/_UploadFile/Images/file/8162066850.pdfIn PDF document text
    • http://recuva.kr/upload/fck_img/1630801364/file/mupatigaxi.pdfIn PDF document text
    • http://mayinluatudong.com/uploads/userfiles/file/nilinepi.pdfIn PDF document text
    • http://www.bordadoindustrial.com/ckfinder/userfiles/files/12142945776.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_off0000e22e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE22E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fa40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA40 18932 bytes
SHA-256: 54449ab5a81a88f55305e8e492431f1b04230c38f9aa7944dcd7ebd7d41263ef
font_02_sfnt_off00012b98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B98 9868 bytes
SHA-256: 94daadd67adb30acde575dbfa14209210664ae37340a9a64438da94baaf54535

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