Malicious PDF — malware analysis report

Static analysis result for SHA-256 02ac57c7e5eee2f3…

MALICIOUS

PDF

88.8 KB Created: 2021-08-10 21:47:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 18c02fbb68f441cf67faabce853e7d6b SHA-1: 58b42e034f045d27e6233c5c590e147cadca17ac SHA-256: 02ac57c7e5eee2f3d149450d19db3a630af5d874f2a7975c085fa08a33f14b9d
96 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites, indicating a link farm or distribution mechanism. The ML classifier strongly flagged this PDF as malicious. While no scripts were extracted, the structure and embedded URLs suggest an attempt to redirect users to potentially malicious content or for SEO manipulation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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 http://www.cheapmotorcycleinsurancepa.com/wp-content/plugins/super-forms/uploads/php/files/sm267mf147q3bpl5ep7utv83a4/42161336365.pdf In PDF document text
    • http://hillsdalehorseboarding.com/ckfinder/userfiles/files/ralonuwaso.pdfIn PDF document text
    • http://chrisdepanneservices.com/Sites/cds/files/64021384707.pdfIn PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160ac79953b0cd---14201597714.pdfIn PDF document text
    • http://diplomat2014.ru/ckfinder/userfiles/files/67627040481.pdfIn PDF document text
    • https://www.apollopowersystems.com/wp-content/plugins/super-forms/uploads/php/files/cc9dd0ae955273feb852a505c41f9763/77222580271.pdfIn PDF document text
    • https://globalazeri.az/wp-content/plugins/super-forms/uploads/php/files/f3f6o28oess9h7sikoss1li9l5/96495777519.pdfIn PDF document text
    • https://xn--i1aam8cb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/b968fd207962f40241018eafb0dfc33a/75039178181.pdfIn PDF document text
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160c2cffb82a89---mejixoba.pdfIn PDF document text
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e0b774bd19---maduxadu.pdfIn PDF document text
    • http://pc580.cn/upload_fck/file/2021-8-5/20210805050139324819.pdfIn PDF document text
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/fe37d649a22b4bd213a5f3d2a5c42b61/3119066799.pdfIn PDF document text
    • http://dungcucaytrong.com/images/files/gofokinabufa.pdfIn PDF document text
    • http://korean-school.hu/hangul/userfiles/file/46223996486.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/16083951aa0473---kilofevotus.pdfIn PDF document text
    • http://verynailscm.com/user_img/file/35940289695.pdfIn PDF document text
    • http://ecofincas.net/ckfinder/userfiles/files/3127572319.pdfIn PDF document text
    • http://alexhoffordphotography.com/temp/files/file/84302268740.pdfIn PDF document text
    • https://33mobility.net/uploads/files/lesag.pdfIn PDF document text
    • https://ises.ca/phpsites/vertical_living/uploads/file/70883058518.pdfIn PDF document text
    • http://maychebiengoduykhuong.com/media/ftp/file/95161912910.pdfIn PDF document text
    • http://parlagame.com/calisma2/files/uploads/mowipepimukofetok.pdfIn PDF document text
    • http://photographybynami.com/wp-content/plugins/formcraft/file-upload/server/content/files/160863b441456a---zotepesokoxilakokokadafa.pdfIn PDF document text
    • https://landbondcorten.com/attachment/file/b1bfaea9cb4cb6c71343d60da3d801e4.pdfIn PDF document text
    • http://mdbim.pl/ubezpiecz/obrazy/file/12461896510.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=como+poner+fondos+de+pantalla+en+movimiento+windows+10+gratisPDF 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_off0000f22a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF22A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010a41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A41 11196 bytes
SHA-256: 98ac93e023db8d2186565f89b7f919a6ce0d8fc322527bf86103156b26c89740
font_02_sfnt_off00012453.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12453 18080 bytes
SHA-256: 1bd17dcff136afa26d5c3435cd48b8c514be88cabf7c9b4d7bfc1a73c7ce6ba7

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