Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca980644c3988693…

MALICIOUS

PDF

86.1 KB Created: 2021-09-03 04:07:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: fec1f16a5c2c43af91a559086a95147e SHA-1: 84d5f9d8c7092188a532aed0f7a1131b262a91ca SHA-256: ca980644c3988693e81c8bc80f292a771f29b59be1bebf213b64f6260e389665
156 Risk Score

Malware Insights

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

The PDF document contains numerous external URIs and links to compromised WordPress upload storage, indicating it functions as a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution through these links. The document's structure and the presence of multiple links to potentially compromised sites point towards an attempt to lure users to malicious destinations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9941

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 https://pistant.ru/uplcv?utm_term=cosmopolite+1+livre+de+l%27%C3%A9l%C3%A8ve+pdf PDF link annotation
    • http://optimus.org.au/wp-content/plugins/formcraft/file-upload/server/content/files/16078742519712---69885637965.pdfIn PDF document text
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c079d05e14f---sewolufinunif.pdfIn PDF document text
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e47b172bab7---55492929608.pdfIn PDF document text
    • http://kadh.kr/bobod/upload/file/53529145273.pdfIn PDF document text
    • https://299-45.com/CKEdit/upload/files/26993069016.pdfIn PDF document text
    • https://rhythmcprandfirstaid.com/wp-content/plugins/super-forms/uploads/php/files/a02ac2ce4d1c66b3b67bfd5173f9879f/lasosoluxedeniku.pdfIn PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/16126d41dafb62---vobabetalugevo.pdfIn PDF document text
    • https://realestateconnect.us/wp-content/plugins/super-forms/uploads/php/files/uhas4pune3ib6pbsnmnfiifr15/62144153773.pdfIn PDF document text
    • http://mirandatutoringcentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16079b9af7c44c---zuborejojok.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/34655989315.pdfIn PDF document text
    • https://nabsangram.com/userfiles/file/40733915948.pdfIn PDF document text
    • http://neoneophytou.com/ckfinder/userfiles/files/45405364750.pdfIn PDF document text
    • http://eaeocs.com/clients/c/c7/c75ed17bfa54634cfc1039f1b599a7e7/File/basofodeguwifaroruto.pdfIn PDF document text
    • http://www.europesolidaire.eu/userfiles/files/ruvonulotakalutojowuvu.pdfIn PDF document text
    • https://nicemexico.net/wp-content/plugins/formcraft/file-upload/server/content/files/1610c5d04a07a3---gonofa.pdfIn PDF document text
    • http://goodfortune.hk/UpLoadFile/file///zelaxasijase.pdfIn PDF document text
    • http://www.jokilaaksonratsastajat.fi/file/95624653724.pdfIn PDF document text
    • http://nhsclassof77.com/clients/c/ca/caa0b9827732345dad94809623212052/File/finowowividajafogokepowe.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/161060f1250ffd---xuzilibomevi.pdfIn PDF document text
    • https://motecx.com/images/file/49747216267.pdfIn PDF document text
    • https://www.popcaffe.it/wp-content/plugins/super-forms/uploads/php/files/02a5f81ce66dff562888f59b09f3f3e2/sanigamofexoda.pdfIn PDF document text
    • https://maximatrimony.com/ckfinder/userfiles/files/texodokipek.pdfIn PDF document text
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/16074bb38be1ad---dosekanezosagafomopobi.pdfIn PDF document text
    • https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/f5a6dfd603025fded23073ea376228ad/26034491758.pdfIn PDF document text
    • 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_off0000d8e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8E7 10884 bytes
SHA-256: aecbe71359a1d2977f04561754f6e1b30813e5ab97a15559cd0e3a1bcb3e6386
font_01_sfnt_off0000f17a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF17A 25472 bytes
SHA-256: cb849ae89b8b40a0df3bc16908a259a3e7f9e829effdece603f6721906c7c644
font_02_sfnt_off000130be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130BE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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