Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7b64ec0248e7c70…

MALICIOUS

PDF

93.7 KB Created: 2021-06-30 16:21:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3b818081d8ff6ed5f4f3365181189499 SHA-1: 5042573dab5d0164635d508d48270769cbf97f5b SHA-256: a7b64ec0248e7c70da6d572fa1e5d35ebb5e848d92f789b272e6986b392ecf95
96 Risk Score

Malware Insights

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

The PDF file contains a large number of external URIs, many of which point to compromised WordPress sites. The ML classifier strongly indicated maliciousness, and the structure suggests a link farm designed to redirect users to potentially harmful content. No scripts were extracted, but the presence of numerous suspicious URLs indicates a likely phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9806

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://pistant.ru/uplcv?utm_term=sitting+independently+baby
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608665c9c7e79---xazekelefeluxazoxazi.pdf
    • https://www.expoagrogto.com/wp-content/plugins/super-forms/uploads/php/files/dnfpfih7fnuusrb4t5av7cqq23/73791649811.pdf
    • https://natyabio.com/uploadfiles/magetekamite.pdf
    • https://digireg.se/upload/fosatinuja.pdf
    • https://www.qbuildsoftware.com/wp-content/plugins/super-forms/uploads/php/files/5d92bfc52f827366856a9171218f07f5/46740366049.pdf
    • http://sva-jeanroze.com/xmedia/file/guxeni.pdf
    • http://tfforming.ru/d/files/32959821558.pdf
    • http://manufim.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/16076342a7d16b---widasarowotiruzipam.pdf
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c168bac0134---63057639459.pdf
    • https://www.northernillumination.com/wp-content/plugins/super-forms/uploads/php/files/40a57e21ab50fadab7f3ffd7439052eb/pijadapoxiremis.pdf
    • https://estidevelopers.com/wp-content/plugins/super-forms/uploads/php/files/63a91ec7dbdd63d57fd3a017ea165119/14491878008.pdf
    • http://www.rosabrockenhaus.ch/ckfinder/userfiles/files/wikokotenezaroweg.pdf
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160b9affc4f798---tifowimukis.pdf
    • http://meteosputnik.ru/userfiles/file/33732869984.pdf
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/e154df4520342de95ee73ecde99cd999/bufib.pdf
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607585f559886---lufuvujepazir.pdf
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aadd7530e83---lejixibiwisuvizin.pdf
    • https://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/qbp3nk10hd4nfq43vhn0bp31p6/winuwumujupagorikinunofa.pdf
    • https://shiokerbau1.com/contents//files/96550103646.pdf
    • https://www.axelendinggroup.com/wp-content/plugins/super-forms/uploads/php/files/ad98a86de82ff89a26c7e9fedd481d95/88087035950.pdf
    • https://anhhuynoithat.com/asset/files/bukanutovibibimisozibig.pdf
    • https://appvid.eus/userfiles/files/dixika.pdf
    • http://clinical-pain.com/pds/userfiles/files/vitaminuladiliravaso.pdf
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/1607365e18bdc8---17468518431.pdf
    • https://csom.cz/wp-content/plugins/super-forms/uploads/php/files/a0ea30c8690c1c907eec69b33f1efb64/50033477608.pdf
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0f16bab204---defubaf.pdf
    • https://www.areatransfers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087fbc54b40b---miguvilekakotax.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010e67.bin
4b74f5193defa3444cd016b941f91485f33448ffead7f7deac7db74a58589089		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10E67 16656 bytes
font_01_sfnt_off00013997.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13997 16792 bytes
font_02_sfnt_off000151ae.bin
d625fa811203ec9dbe605628d152b2c235899a2bcff80aad43c838c6b2385ee7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x151AE 10508 bytes

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