Malicious PDF — malware analysis report

Static analysis result for SHA-256 345f9818f0e8bc92…

MALICIOUS

PDF

102.1 KB Created: 2021-09-05 14:48:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 36b9660d201eec0487518bf7a37874e6 SHA-1: 51e6fd711c38096e3cb494980b38a78717f59dca SHA-256: 345f9818f0e8bc92664d84deac123035fe97be557b702ed6fb6ccbe6bbcc9934
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous compromised WordPress sites and other disposable hosting. This structure is indicative of a phishing or malware distribution campaign, aiming to lure users to malicious content. The ClamAV detection and ML classifier strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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 http://escalierdurire.fr/ckfinder/userfiles/files/wowopibikimexamejudujopab.pdf In PDF document text
    • https://casalindasbakery.com/ckfinder/userfiles/files/vuxibona.pdfIn PDF document text
    • https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/d7b5f1a423ef1f4f578c011e72d0d921/devazosimupegikawata.pdfIn PDF document text
    • https://gfow.om/wp-content/plugins/super-forms/uploads/php/files/09cmgt396cf80it4qt1pa173ca/gudupisapofokig.pdfIn PDF document text
    • http://canhtoanland.com/upload/files/53762973426.pdfIn PDF document text
    • https://groupburuemas1.com/contents/files/butisa.pdfIn PDF document text
    • https://soccerauquebec.com/userfiles/file/bagomipa.pdfIn PDF document text
    • http://nwatchonline.info/userfiles/file/tizimigax.pdfIn PDF document text
    • http://bmhs1963.com/clients/7/72/7286fd37811b7a5dece6e69924e4d5ab/File/28806067313.pdfIn PDF document text
    • http://sunrui-ti.com/d/files/lizuzozogase.pdfIn PDF document text
    • http://www.elitagida.com.tr/wp-content/plugins/super-forms/uploads/php/files/2pblmd4sb2vej8kirkb7amjhh1/2689164665.pdfIn PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7cc665357---nisudubenaranisazakij.pdfIn PDF document text
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2c9148c916---gozavenazosajotelimun.pdfIn PDF document text
    • https://estidevelopers.com/wp-content/plugins/super-forms/uploads/php/files/b06a082d6ab5565140db3c4adbe3b213/damedutusarurimi.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/dorif.pdfIn PDF document text
    • http://saovietgroup.com/upload/FCK/file/savimipumelofujomazumol.pdfIn PDF document text
    • http://sbnjl.com/userfiles/files/funiminexofomoditaz.pdfIn PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e5029346cf---lepofisopazobasanokusim.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/19b4vc7in89n271if7nj3vjmm1/55123506410.pdfIn PDF document text
    • https://netshopnepal.com/userfiles/file/lijukowamaginejutuvapugav.pdfIn PDF document text
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/3mf180esoesq42ouio8lnohsii/potibekudipoxovexibu.pdfIn PDF document text
    • http://1975geegees.com/clients/78603/File/binupebopemefofowug.pdfIn PDF document text
    • http://np-laser.com/upload_fck/file/2021-8-7/20210807145228473731.pdfIn PDF document text
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/dl55ppn79361lb2dgc1fi73hnm/18709446883.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=mapping+skills+worksheets+grade+6PDF 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_off0001266c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1266C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00013e7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E7E 19200 bytes
SHA-256: ebc513759510e1a8ca61dc79e4ac3032b230ac18e35826f2ffd6f65c76cc3132
font_02_sfnt_off000170fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x170FE 11008 bytes
SHA-256: 07681e130341f536983588a9a80f4b183e15ce079f328741e273c7fec9e8d49a