Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ac7c2652764a218…

MALICIOUS

PDF

89.8 KB Created: 2021-08-11 05:13:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: d4f6e3d26d1c3084681d5ba7db743491 SHA-1: 3c93f95dea57ea32c01546d137777af6165b3328 SHA-256: 3ac7c2652764a218f410e2eba3bfbf53793cbdbfd3c2afbe744aa74f5ba223ca
96 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 5

  • 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://lightsourceindiana.com/wp-content/plugins/super-forms/uploads/php/files/ede633346e7ae9b509b69269def842b6/58054027451.pdf In PDF document text
    • https://ecosolar-energy.com/piceditor/file/43350842771.pdfIn PDF document text
    • http://happypalettebnb.com/CKEdit/upload/files/nutorugobuzixezoke.pdfIn PDF document text
    • http://tomasmrazek.cz/userfiles/file/9448323329.pdfIn PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16078bec3110b9---34920057660.pdfIn PDF document text
    • http://manufim.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1609c56b88b6f0---levifibuseguneriw.pdfIn PDF document text
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609f039bb428c---senotakarale.pdfIn PDF document text
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608aae5e5aa25---38873901933.pdfIn PDF document text
    • http://dichvutheapec.com/upload/FCK/file/zixegot.pdfIn PDF document text
    • http://baraanduliaptti.org/userfiles/file/9941855713.pdfIn PDF document text
    • https://refour.dk/wp-content/plugins/super-forms/uploads/php/files/3e83ded2ee175a9ac26d95ae4c67e700/96713936042.pdfIn PDF document text
    • https://www.vbclighting.com/wp-content/plugins/super-forms/uploads/php/files/edfeebab054536c6c1e79d415406f6d9/dulusukonis.pdfIn PDF document text
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/0290a4ad850e1f7bbe34ea569994e452/vigepi.pdfIn PDF document text
    • https://jasz-pap.hu/UserFiles/file/zeweginaxavufoteximala.pdfIn PDF document text
    • https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/bmp8ctfnujcufgcv6geth3iui5/72175304048.pdfIn PDF document text
    • http://adirondackseafood.com/ckfinder/userfiles/files/pazutakidegonifiwip.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e6b0c59a33---wufekedonosizepo.pdfIn PDF document text
    • http://novussiteyonetimi.com/uploads/file/wizokufokukirajekub.pdfIn PDF document text
    • http://kulturazebrak.cz/userfiles/duwexalewamunin.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160c2c63ff06d0---golilabepolup.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/q5ob1plok8e99h0es1hfgi64k0/fulaja.pdfIn PDF document text
    • https://neavocats.com/wp-content/plugins/super-forms/uploads/php/files/92e3f311f5ea44b548b5998c2edbc8e2/nibuduzevav.pdfIn PDF document text
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/bd1c24f99e81dac9334b91d14545456e/25123730641.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16077a5550f27d---powefidiwosumowojatesul.pdfIn PDF document text
    • https://samarpanbharat.org/trila/userfiles/file/raxerefelisivusawe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=download+film+the+hunger+games+sub+indo+bioskopkerenPDF 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_off0000f7df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7DF 17988 bytes
SHA-256: feccd29a36a915f551c6852345653e178fb7fafc166991aea402b13a806fd948
font_01_sfnt_off0001267c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1267C 11364 bytes
SHA-256: d993f7b4dd93d4cfd667b513f4bb69de8ac7bfbbe5c4f114b5961dc27b7ef322
font_02_sfnt_off000140a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x140A4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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