Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a30276e896655a0…

MALICIOUS

PDF

96.8 KB Created: 2021-09-06 20:37:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 54cfc388ceeced51340ab1c76d8c7951 SHA-1: edf8e9f8a4913a6a4bc0af392ff50586b9ed3418 SHA-256: 4a30276e896655a0eec06b18b5891774c30faa3a5899abefb315e34eb856e077
156 Risk Score

Malware Insights

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

This PDF was flagged by a machine learning classifier and ClamAV as malicious, indicating it likely exploits a vulnerability or contains malicious content. The heuristics reveal it functions as a link farm, directing users to multiple compromised websites, some hosted on disposable domains or compromised CMS uploads. This suggests an attempt to distribute phishing content or further malware payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9929

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://www.bandungmesin.com/file/ligifepumukiralot.pdf In PDF document text
    • https://open-call.fr/uploaded/files/dumanomoroju.pdfIn PDF document text
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/633e8fe9fdee0a6d73cbabcf7d916cd5/38335701231.pdfIn PDF document text
    • http://bkht.vn/userfiles/file/kolejaxokisunufegexogiso.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a69efcddbe---xefemupabafebow.pdfIn PDF document text
    • https://limsurempat.com/contents//files/sukuzipolivobaperigekir.pdfIn PDF document text
    • http://portalinmobiliario24.com/uploades/fckeditorfile/345611110.pdfIn PDF document text
    • https://area34.info/wp-content/plugins/super-forms/uploads/php/files/bq0ls3oosucbcnso0ktde683q2/simijonukesi.pdfIn PDF document text
    • https://santchavarabed.in/ckfinder/userfiles/files/88880040134.pdfIn PDF document text
    • https://luminex.pl/upload/file/suzonedikerobo.pdfIn PDF document text
    • http://1night2day.com/ckupload/files/42837906215.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1609f6f1b5c516---limifekesab.pdfIn PDF document text
    • http://amdind.com/userfiles/file/vozerifuzorat.pdfIn PDF document text
    • http://theofficefurniturestore.com/ckfinder/userfiles/files/68959593678.pdfIn PDF document text
    • https://smartmedia.ro/app/webroot/files/userfiles/files/24560992913.pdfIn PDF document text
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/mhd7q55lkqovid728cs0r7g0g2/bafififofo.pdfIn PDF document text
    • http://mpu-beratung-brendle.de/userfiles/file/pimivi.pdfIn PDF document text
    • http://crystalnymph.by/wp-content/plugins/super-forms/uploads/php/files/87dce3be8d14fc858a333187b8ae1e6c/jekisoladumugelimag.pdfIn PDF document text
    • http://rosabaum.de/web/editor/files/wekinorajosub.pdfIn PDF document text
    • https://www.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160a8a5a053721---96154277422.pdfIn PDF document text
    • https://www.apollopowersystems.com/wp-content/plugins/super-forms/uploads/php/files/c2e62c6b81913e52eeb8d0c7ddfdc9a5/lifokuwonisexonifuk.pdfIn PDF document text
    • https://verticala.ro/images/userfiles/65178807617.pdfIn PDF document text
    • https://www.citysecurity.org.uk/wp-content/plugins/super-forms/uploads/php/files/vcag830v8kenq0mqn7puoj3ic5/wugavufofivowom.pdfIn PDF document text
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c1bf996d3c2---panefekizobafus.pdfIn PDF document text
    • http://lushexperiences.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080ec7765177---saremol.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=glossario+sanscrito+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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001103b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1103B 20620 bytes
SHA-256: 7b04046b186c52afc825d6172ea60b04835869bb165cc28e7dc90f1074c76946
font_01_sfnt_off00014589.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14589 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015da0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15DA0 10520 bytes
SHA-256: 03d6389ae7eef54073e57fa580c34b7ed19772295af3ae73a994a0216a45ce0b

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