Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c5add6bed5bfa27…

MALICIOUS

PDF

71.4 KB Created: 2021-10-01 01:21:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: b0e7ff1bb3a054feda990dbd0ba1ce3e SHA-1: 973ab3763e48aa64755132eb25a30cbb4078eb7b SHA-256: 0c5add6bed5bfa2726d65c0384bbd43168d10c952db795e59beb9610e62a6da5
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to compromised CMS upload directories or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. ClamAV detected this file as Pdf.Phishing.Trojan, and ML classification strongly suggests malicious intent. The document body is heavily obfuscated, preventing a clear understanding of its specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9893

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://wastran.ru/uplcv?utm_term=spivak+calculus+on+manifolds+solutions PDF link annotation
    • https://encoyun.com/calisma2/files/uploads/fitusegikesofi.pdfIn PDF document text
    • https://marikakozmetika.hu/editor_up/fubavogujitawuf.pdfIn PDF document text
    • http://rbc-bezorgdiensten.nl/upload/wipoluju.pdfIn PDF document text
    • https://eric-parnes.com/ckfinder/userfiles/files/pawiwan.pdfIn PDF document text
    • http://blueyee.com/upload/file/2222214213.pdfIn PDF document text
    • http://elfuklid.cz/foto/Image/file/55117647806.pdfIn PDF document text
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/16149a17cb35af---59892296055.pdfIn PDF document text
    • https://guapa2.com/admin/fck/file/sudalaxipazo.pdfIn PDF document text
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/539f3be66cb1b53b9e973aff15d967bd/famijapufobesa.pdfIn PDF document text
    • http://nhakhoauytinhaiphong.com/upload/files/67602438683.pdfIn PDF document text
    • http://strojsteel.cz/webpagebuilder/ckfinder/userfiles/files/kowopot.pdfIn PDF document text
    • http://train-in-japan.com/images/blog/file/naponawixewirijufit.pdfIn PDF document text
    • http://bubb.cn/up_file/file/pedefusa.pdfIn PDF document text
    • http://chelseafoodmart.com/uploads/files/52244397753.pdfIn PDF document text
    • http://chirineli.com/img/lib/file/87614894015.pdfIn PDF document text
    • https://www.abaco-engineering.it/wp-content/plugins/formcraft/file-upload/server/content/files/16139677e6908a---sotimagev.pdfIn PDF document text
    • https://grupahatak.pl/admin/_fck_files/file/rutobiwidazadowugegifik.pdfIn PDF document text
    • http://kirilmazbardak.com/userfiles/file/buribelozajupafa.pdfIn PDF document text
    • http://araulmor.tel-cor.com/images/library/file/1263104277.pdfIn PDF document text
    • http://top-caster.com/userfiles/file/tadivumufomapikowuterad.pdfIn PDF document text
    • http://atsolution.org/userfiles/file/20210913071522819879150.pdfIn PDF document text
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/161495c5072f80---nipupofefok.pdfIn PDF document text
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/h547u5lnde8eq1r3p3k43l1o7o/sudokupuxuzovapoduz.pdfIn PDF document text
    • https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/67f11497ee344ccdb3ea5dbe2d5079e0/51836594412.pdfIn PDF document text
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/633be8f8ead5eee561daa3c39da16da0/tuforomawuvejirirapopo.pdfIn PDF document text
    • http://clinicaveterinariagussago.com/userfiles/files/20225921898.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_off0000b2de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2DE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000caf5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAF5 10884 bytes
SHA-256: 89e0ca0af73db87b0f9ef63bded5c97eae8ef2c106139c8d9dead4d916d5f0b5
font_02_sfnt_off0000e41d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE41D 16808 bytes
SHA-256: 5f1deb53421f6a267e2d840f51e7d0b94b76c73f81419d0e2e51222858bbb587

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