Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c24bdcd4b53f647…

MALICIOUS

PDF

85.3 KB Created: 2021-06-17 15:04:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-23
MD5: adc23aec9f1e4dbf76fe78a5658b264e SHA-1: 8cf223f7ca8fdc37693fe1faac64de454de58215 SHA-256: 9c24bdcd4b53f6474484b7124f5256f10e0e4b8803d2f3aab7327a994031cf00
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

This PDF document was flagged as malicious by an ML classifier. It contains numerous embedded links, many pointing to compromised CMS upload storage or disposable hosting, suggesting a link farm or SEO poisoning tactic. The presence of a 'download button' lure further indicates a malicious workflow aimed at tricking users into downloading potentially harmful files. No scripts were extracted, but the overall structure and heuristics strongly suggest a malicious intent to distribute further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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://allytemp.ru/uplcv?utm_term=tamil+full+movie+download+2017 PDF link annotation
    • http://romanakladatelstvi.cz/userfiles/file/melobodejufurige.pdfIn PDF document text
    • http://armanetti.com/images/75029544812.pdfIn PDF document text
    • https://samarpanbharat.org/trila/userfiles/file/pefezeku.pdfIn PDF document text
    • https://krimgranit.ru/wp-content/plugins/super-forms/uploads/php/files/4175c03c907e96d147ec1a31815faf78/54608911384.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/sibasakixusajofoxajironut.pdfIn PDF document text
    • http://prime-standard.com/piceditor/file/juzutumerurewopunake.pdfIn PDF document text
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a56f53420f1---lanufokodemaminorofit.pdfIn PDF document text
    • http://otvorene-srdce.sk/userfiles/file/27870189922.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609464db2116a---24611117326.pdfIn PDF document text
    • https://www.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/1e1aebfd1d5e331f3d2f217f43017375/wozesovow.pdfIn PDF document text
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094c6dbd6aa5---xirosepawisewesiva.pdfIn PDF document text
    • https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/1ac48baa19af67a4b9786a8c9b3ce804/41189613202.pdfIn PDF document text
    • http://zabradli-znerezu.cz/userfiles/file/29994597267.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000103da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103DA 5088 bytes
SHA-256: 4b6dd8ca52b4c34528fe11da8a96243a022bdf9ede6509449445a75db2a657f5
font_01_sfnt_off00011533.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11533 10856 bytes
SHA-256: 5d1262417d637bc42be0484413918dfb6373c2283c56ed438b22e3c0b5b1576a
font_02_sfnt_off00013a17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A17 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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