Malicious PDF — malware analysis report

Static analysis result for SHA-256 843b655c5b020994…

MALICIOUS

PDF

92.6 KB Created: 2021-09-06 19:33:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: fbcd4d40651fd9befed31347ecc8bff7 SHA-1: a369e8549e5d01698da3c7a14ef91894c8a13450 SHA-256: 843b655c5b020994d8627df22ee94c6cef48e21bd18eb8599f7df31ef1e05096
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or are part of a link farm designed to obscure the final destination. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or distributing further malware. The presence of multiple external URIs and link farms suggests an attempt to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9930

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://geoodwierty.pl/files/file/nevupunadibejiwidemek.pdf In PDF document text
    • http://npas.ru/pic/file/walulavasurezuxaduz.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/16083986f5e205---64599789544.pdfIn PDF document text
    • https://www.llgnjinc.com/wp-content/plugins/super-forms/uploads/php/files/df47bc4da139126fb27c4e6b1705acec/zusuwizedixixuzuzofikape.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abef493fd06---20435225520.pdfIn PDF document text
    • https://biothiennam.com/media/ftp/file/39403027890.pdfIn PDF document text
    • https://childconcern.in/trila/userfiles/file/89623286030.pdfIn PDF document text
    • http://longarmacademy.net/fckeditor/userfiles/file/40983446029.pdfIn PDF document text
    • http://reclaimsplus.com/wp-content/plugins/super-forms/uploads/php/files/0a20fe98df8092d8e75206b60a8f3221/8511654778.pdfIn PDF document text
    • http://rivieahk.com/clients/5/51/51325344bd1517f257d6959d5350918e/File/gipukirom.pdfIn PDF document text
    • http://ilkyoukais.com/Images/Media/files/vigamisavafuraja.pdfIn PDF document text
    • https://securitegenerale.tn/userfiles/file/93155557343.pdfIn PDF document text
    • http://lindseyderence.com/userfiles/files/34725097967.pdfIn PDF document text
    • http://findmealocalpainter.com/insurazon/admin/userfiles/file/tebemexufosa.pdfIn PDF document text
    • http://shethof.ch/cgi-bin/dynamisch/file/dagosozadeditika.pdfIn PDF document text
    • http://alternativefitness.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c48a1d7aaad---gawigakexux.pdfIn PDF document text
    • https://vatlieutaphu.com/upload/files/puwinib.pdfIn PDF document text
    • http://telegid.tv/userfiles/files/titezawe.pdfIn PDF document text
    • https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/6f7112a077e70e1636ef5314ce4e3935/13423454830.pdfIn PDF document text
    • http://www.homefacelifters.com/wp-content/plugins/super-forms/uploads/php/files/a82f53aeda6ab5def6224204352ca4c4/20709745377.pdfIn PDF document text
    • http://terrietanaka.com/library/files/dixevegujo.pdfIn PDF document text
    • https://dienlanhhonganh.com/images/pic/file/gubise.pdfIn PDF document text
    • http://andrelandberg.com/userfiles/file/rarenu.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612e8b44b2b86---66328926966.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=hakim+bey+libros+pdfPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e135.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE135 27168 bytes
SHA-256: 240c2f04a127c79b823002728a0d71d659ad51c3c9e6da0a923673fdd403d933
font_01_sfnt_off00011f14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F14 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001372b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1372B 10792 bytes
SHA-256: 988d41a69bd1e5345aa504e7522b48d252af70b92bf8367820a5d37b812cc2e7
font_03_sfnt_off00014fbb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14FBB 5156 bytes
SHA-256: 64d99d42469431982b65f11e51d3117a18c602a056e851498af651572f806ee6

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