Malicious PDF — malware analysis report

Static analysis result for SHA-256 8753b1225b1afa51…

MALICIOUS

PDF

88.0 KB Created: 2021-06-29 07:32:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: da51d49169379bbccb70f1ecedd28271 SHA-1: 0314ad9301438ac654df9b00667643136136cb04 SHA-256: 8753b1225b1afa5137c7656c3d77e786d2a0d958c6aec1e4de42c375f3340e6b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1105 Ingress Tool Transfer

The sample was identified as malicious by ML classifiers and ClamAV, flagging it as a phishing trojan. Heuristics indicate it functions as a link farm, hosting numerous PDFs on compromised CMS upload directories. These links likely serve as lures for phishing attacks or to distribute further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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.festivalmarrakech.info/wp-content/plugins/formcraft/file-upload/server/content/files/1607d120060e39---70333315003.pdf In PDF document text
    • https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/k88437rspe9n82f6vubci5dp2q/keridi.pdfIn PDF document text
    • https://www.elitelawnsolutions.co.uk/wp-content/plugins/super-forms/uploads/php/files/kdm2r9vnbmnh2uku7hojha188b/gaxalesokore.pdfIn PDF document text
    • https://latework.cz/soubory/67872504977.pdfIn PDF document text
    • http://joshuadacosta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607faf96510fd---32327133102.pdfIn PDF document text
    • http://dainichiji.com/upload_ckr/files/34640961599.pdfIn PDF document text
    • http://sahrugs.com/userfiles/file/zoxadit.pdfIn PDF document text
    • http://tajesink.com/Uploadfiles/files/penukuminigiwil.pdfIn PDF document text
    • https://theemperorsoldclothes.co.uk/wp-content/plugins/super-forms/uploads/php/files/7jnoni4pq7ggsboi5g73v2qm5i/sovivovezorevujar.pdfIn PDF document text
    • http://clinicaveterinariabilancino.it/userfiles/files/demevodoxoxafebimegedu.pdfIn PDF document text
    • http://www.kmclogistics.com/wp-content/plugins/super-forms/uploads/php/files/44ab4cc830fff31fe0fb71a69a59f001/82365337902.pdfIn PDF document text
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072dd42c6376---39998224080.pdfIn PDF document text
    • http://rbtyutj01.com/userfiles/files/3122112868.pdfIn PDF document text
    • http://www.associatedomains.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080df4a374eb---34589393723.pdfIn PDF document text
    • https://rfcorporation.net/wp-content/plugins/super-forms/uploads/php/files/9ffbaac9e5761553185f9b7d6d72872b/nofikisulav.pdfIn PDF document text
    • http://tensoinox.com/userfiles/files/bedunuviruzexigosawoko.pdfIn PDF document text
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/160be00819b178---dusume.pdfIn PDF document text
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/f4529bc7046b9348082defe4481e4bd0/66370734170.pdfIn PDF document text
    • http://vipforiraq.com/userfiles/files/37487282724.pdfIn PDF document text
    • http://pizzeria-millemiglia.de/app/webroot/img/editor/file/27310347458.pdfIn PDF document text
    • http://ithaca1962.com/clients/41687/File/sirixu.pdfIn PDF document text
    • http://wskinbody.com/data/boardData/files/tadazekifefekagakaf.pdfIn PDF document text
    • http://plenaadoracao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160766365de963---65823990048.pdfIn PDF document text
    • https://elegune.net/files/galeria/files/68486261802.pdfIn PDF document text
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/9cc24ac70fbae2c1c3e6691874922b40/totadetufeloridape.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=kwh+to+thermsPDF 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_off0000e74d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE74D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ff64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF64 10044 bytes
SHA-256: c7c6b354d8e1efd948a3021ef85bf74df82182523335b699c6aec0b5a6b84ba9
font_02_sfnt_off000115d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115D4 29788 bytes
SHA-256: e1a26e912382faa81a0aeae375d7899aaeecbcb9b10517644a732e47a0d454c6