Malicious PDF — malware analysis report

Static analysis result for SHA-256 103eef4d1c2f1b15…

MALICIOUS

PDF

69.7 KB Created: 2021-09-04 23:13:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 2ccbb15a8b64d3f41b2db517fe63dc92 SHA-1: 76070a518df6dfd1c9658f4b9f3f4ab815516873 SHA-256: 103eef4d1c2f1b155a543116b40c96ac25144aaa089abead26810228ce91e82c
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or malware distribution intent. It functions as a link farm, containing numerous URLs that point to various websites, many of which appear to be compromised or disposable hosting. The primary purpose seems to be directing users to external, potentially malicious, content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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=convert+zip+to+pdf+i+love+pdf PDF link annotation
    • http://perchegouet.com/ckfinder/userfiles/files/4891539438.pdfIn PDF document text
    • http://pericosrentcar.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16091d17689669---lilibegokujunuzobojibadaf.pdfIn PDF document text
    • https://asaptransfers.co.uk/wp-content/plugins/super-forms/uploads/php/files/vtralpsv925tmtmnipfnrf6fk1/70313498019.pdfIn PDF document text
    • https://egyiksem.hu/uploads/file/16165080269.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/oaa6pjvh3mntrvieh6ru8o4mvi/tilokokegetak.pdfIn PDF document text
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d8cd0a61e42---78412014890.pdfIn PDF document text
    • https://agrilaui.com/userfiles/file/59168470699.pdfIn PDF document text
    • https://limblength-sldf.com/userfiles/file/lesuwewuru.pdfIn PDF document text
    • http://techscreening.com/userfiles/files/65067692802.pdfIn PDF document text
    • http://cerescommoditiesltd.com/Images_upload/files/taposobevagirumabavas.pdfIn PDF document text
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b7fe83040a9---45741023906.pdfIn PDF document text
    • https://liniagdanskzydowo.pl/files/sufutowigawireleg.pdfIn PDF document text
    • https://www.nordatec.com/wp-content/plugins/super-forms/uploads/php/files/94ncdralrr2ap2j6679uu039a5/ziwomudukufisa.pdfIn PDF document text
    • http://xn--b1agaa2anfqdp.xn--p1ai/ckfinder/userfiles/files/niweputigefelifidizud.pdfIn PDF document text
    • https://robinio.de/wp-content/plugins/super-forms/uploads/php/files/bjqop2r1uth90j52nrjg6uvq7o/39575523817.pdfIn PDF document text
    • http://chingyi.tw/userfiles/files/24941255217.pdfIn PDF document text
    • https://aslplastic.com/ckfinder/userfiles/files/76229749100.pdfIn PDF document text
    • https://hafa-verein.de/wp-content/plugins/super-forms/uploads/php/files/727b8678858d08ef04ebba64b23c3fd9/gusutivofobatuwigi.pdfIn PDF document text
    • http://extintoresorigen.com/images/editor/panotozipasomobawunogu.pdfIn PDF document text
    • https://www.siemers-deutschmann.de/wp-content/plugins/super-forms/uploads/php/files/75ekpcdoue1a96t9ak382560k0/xaxowud.pdfIn PDF document text
    • https://motecx.com/images/file/9003155238.pdfIn PDF document text
    • http://faw-asia.com/image/upload/files/lugajutusomorani.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_off0000b3d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3D1 14908 bytes
SHA-256: 62b982106cfa3dd39258009c5f3f40716590ce49624fcc4630318c9f3785ebfa
font_01_sfnt_off0000d96b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD96B 10316 bytes
SHA-256: 43171d112ff4dbd0b4c5a113fa393f0496fe8f50249821350dbeefbfdcec34fb
font_02_sfnt_off0000f0d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0D3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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