Malicious PDF — malware analysis report

Static analysis result for SHA-256 4193c98266ed55f0…

MALICIOUS

PDF

72.0 KB Created: 2021-09-18 06:02:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 9b025a30a4ca05d55ea6df121adfac25 SHA-1: 89cbc6e87493d9a61adbad529ff9f90ef23fa2f1 SHA-256: 4193c98266ed55f0c8df9d55d4d272a40e7ae5118428ddd6bfd2b2d092b580ac
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Static analysis revealed it functions as a link farm, containing numerous URLs pointing to external PDF files hosted on various domains, some of which appear to be compromised CMS uploads. The presence of 'utm_term_redirector=True' suggests an attempt to obscure the final destination or track user clicks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://bisnismedsos.com/userfiles/file/fironisupupulilesivid.pdf In PDF document text
    • http://www.ssc-ras.ru/ckfinder/userfiles/files/89490683128.pdfIn PDF document text
    • http://peak-experience-japan.com/images/blog/file/48714968532.pdfIn PDF document text
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d3925c790a---68942589565.pdfIn PDF document text
    • http://interreg-ipa-husrb.com/downloads/38333655324.pdfIn PDF document text
    • https://www.ibyservice.com/wp-content/plugins/super-forms/uploads/php/files/231d5fbceb4c0a7e9d1d07e35e082dbf/jodekitinejejofat.pdfIn PDF document text
    • http://chiangmai-clean.com/user_img/files/geveniradawefu.pdfIn PDF document text
    • http://arablift.net/userfiles/file/66461312948.pdfIn PDF document text
    • https://lmbri.com/WYSIWYGImage/file/timutotetor.pdfIn PDF document text
    • https://tdfstore.it/file/zafafiboge.pdfIn PDF document text
    • http://kutscher-customs.de/gfx/userfiles/files/77650289520.pdfIn PDF document text
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161387d9ce2cf1---sujodorinexerorubugiv.pdfIn PDF document text
    • http://gryfarmerskie.pl/pliki_wyswig/files/mukatepesifekepuzifo.pdfIn PDF document text
    • https://festivaldelmaridaje.com/sgi_userfiles/userfiles/files/dawesesivif.pdfIn PDF document text
    • http://alessandrobelleseveterinario.eu/userfiles/files/13209896090.pdfIn PDF document text
    • http://indecomavo.pl/userimg/inc/89697499018.pdfIn PDF document text
    • http://analogsys.com/uploaded/file/19363538406133d22968fd2.pdfIn PDF document text
    • http://bloomx.com/sites/all/sites/bloomx.com/files/24112523152.pdfIn PDF document text
    • http://yjbiotech.cn/upload/files/70401502118.pdfIn PDF document text
    • http://glavis.biz/userfiles/file/voxabujolinikixodut.pdfIn PDF document text
    • http://marjoleintje.nl/include/userfiles/xemopalagalutipaxobife.pdfIn PDF document text
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16141388bc8ddc---gujelipavebakefipuwiwitu.pdfIn PDF document text
    • http://adasbruiloften.nl/userfiles/file/jivatexowatupaworipoga.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=beautiful+o+wordsPDF 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_off0000b8e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB8E5 16084 bytes
SHA-256: 7ce3d19c0f2f893537c121fc2c9201fded97c8e5513ce8d7b0086e942b3d3f64
font_01_sfnt_off0000e246.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE246 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fa5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA5D 10480 bytes
SHA-256: 51eff873e734435dd2c2a2bae5ad2f35885f28898c4f51e7a3161233d1f3ad7b

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