Malicious PDF — malware analysis report

Static analysis result for SHA-256 040a9796330e84c8…

MALICIOUS

PDF

81.0 KB Created: 2021-09-03 04:37:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 11cd04421a1c11cccceba9c95b587cec SHA-1: 37910fb00cc55b96d584fe0b90ab274e2277916a SHA-256: 040a9796330e84c8a5e00a351a949b6f3b6aa873397c3bce578c90d336f73aba
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable domains, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery. The file's structure and URL patterns are consistent with a spearphishing attachment used to lure victims into clicking malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://luminex.pl/upload/file/88173963388.pdf In PDF document text
    • http://ferramentabelleggia.it/public/file/40843748524.pdfIn PDF document text
    • http://attlas.center/userfiles/file/puwuxefaf.pdfIn PDF document text
    • https://mimpiindahsatu.com/contents//files/sexirubofuporipofuteg.pdfIn PDF document text
    • http://lateonsettay-sachs.org/userfiles/file/nevadobivukufa.pdfIn PDF document text
    • https://semagro-msw.ru/pics/images/file/90347143865.pdfIn PDF document text
    • http://multiseal.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/160c43276286f0---67578362357.pdfIn PDF document text
    • http://vladjurnalist.ru/archive/file/zaxuza.pdfIn PDF document text
    • http://choragwica.pl/userfiles/file/kevaluv.pdfIn PDF document text
    • https://implant-drill.com/userfiles/file/lubetumuguxavos.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16072f42875098---jepakozulupapubek.pdfIn PDF document text
    • http://dobre-jaja.com/Upload/file/mupowowumunafazile.pdfIn PDF document text
    • https://clinicaabrahaoosta.com.br/ckfinder/userfiles/files/44703364319.pdfIn PDF document text
    • http://hockeydh.com/files/ups/files/vanexeguw.pdfIn PDF document text
    • https://krimgranit.ru/wp-content/plugins/super-forms/uploads/php/files/d1115e04da5f06685892a8cfc21f6288/39441851531.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/g4v0s7kuvonb693v07is172500/62675701780.pdfIn PDF document text
    • http://celiapopememorial.com/clients/4/45/45605e685ba8a3b32f56966823665796/File/nisedugineruviwux.pdfIn PDF document text
    • https://aannemingsbedrijfbarthulsbosch.nl/userfiles/file/49218898305.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ca5f0c15216---53104162204.pdfIn PDF document text
    • http://krevue.cz/UserFiles/File/vodetivegajimofuwolazeb.pdfIn PDF document text
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d803fc459ef---fagudirawin.pdfIn PDF document text
    • http://npxbyy.com/wang3_3_10_27/Upload/Upload/file/2021624127413130.pdfIn PDF document text
    • http://ciskmv.com/css/file/wejejubo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=advanced+chemical+kinetics+book+pdfPDF 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_off0000d356.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD356 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eb68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB68 18632 bytes
SHA-256: 2f571ae59fb68cfc3c63705de2cc4999efcd2999079f93c3d81be77955a30a3a
font_02_sfnt_off00011b5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B5A 11064 bytes
SHA-256: 9f5a91889742ad0794473fa1ed495a6ac931ebb03738bd532f826e30dfec698c

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