Malicious PDF — malware analysis report

Static analysis result for SHA-256 d1f36ddb7255aa53…

MALICIOUS

PDF

86.1 KB Created: 2021-09-02 18:29:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 1aab98e497f8933ed88978505c6d496b SHA-1: 1b2e58f172a7b5a97d9b7c18cf1ce2df348b49ff SHA-256: d1f36ddb7255aa53eddc00ad55d5c5a58db0a3d479347f48f191ba66886ca930
156 Risk Score

Malware Insights

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

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to numerous distinct hosts, many of which are hosted on compromised CMS uploads or disposable domains. The embedded URLs suggest a phishing or malware distribution scheme, likely delivered via spearphishing.

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 https://whatshoulditcostme.com/userfiles/file/4041219662.pdf In PDF document text
    • https://tylbm.com/Upload/ckeditor/files/10618733427.pdfIn PDF document text
    • https://www.clinicaepilepsia.cl/ckfinder/userfiles/files/68316514794.pdfIn PDF document text
    • https://neksav.com/upload/ckfinder/files/sepabat.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/do003hsasohjjhvet1cv0tebr7/64594288911.pdfIn PDF document text
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/198b5712a0ea82aae57ad42fb2551dd9/65834517595.pdfIn PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607281730de0f---pudosupi.pdfIn PDF document text
    • https://derechosenred.org/aym_image/files/38134830005.pdfIn PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160711b50095c7---61956323162.pdfIn PDF document text
    • http://vamaconsulting.sk/userfiles/file/95377459180.pdfIn PDF document text
    • https://dagvandearchitectuur.be/_files/file/taxukarotek.pdfIn PDF document text
    • http://everest-c.ru/ckfinder/userfiles/files/mijutazisejuxo.pdfIn PDF document text
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/160bfa9ec755d6---wufejatopifemamexaro.pdfIn PDF document text
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/dac187b731afb51fe1ef802acc4745f9/vudisovilinerigatamarinok.pdfIn PDF document text
    • http://de.ruben.pl/ckfinder/userfiles/files/29042227280.pdfIn PDF document text
    • https://readxyz.com/wp-content/plugins/super-forms/uploads/php/files/670ff957caec92df0945652134a4e5aa/96303283497.pdfIn PDF document text
    • https://www.corridar.com/wp-content/plugins/super-forms/uploads/php/files/80vvf2uu63aa5sjk75sb7mknfc/gevexakabinof.pdfIn PDF document text
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160a75233097cb---78763171049.pdfIn PDF document text
    • http://aqcons.vn/upload/files/78454546235.pdfIn PDF document text
    • http://55thocscompany.com/clients/62662/File/90173553463.pdfIn PDF document text
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/20ag8bnb09blmajvtd1a2fi5t5/rijafezepemusisosa.pdfIn PDF document text
    • https://www.infrascale.com/wp-content/plugins/super-forms/uploads/php/files/4e93db080af91dd8b2dcc034ae8b2456/64431948122.pdfIn PDF document text
    • https://gs-hemeringen.de/ablage/userfiles/files/suberatatevi.pdfIn PDF document text
    • http://tieclangman.com/Images_upload/files/95572548622.pdfIn PDF document text
    • https://villadorottya.hu/uploads/frontend/files/donisubajubo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=second+order+linear+differential+equation+with+constant+coefficients+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_off0000e3fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3FE 11124 bytes
SHA-256: f5d58ec2c3b4481ce145aa4042b08e9915ae06db20fc5cb97138c0d12623a8f1
font_01_sfnt_off0000fdbd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDBD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000115cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115CF 20072 bytes
SHA-256: c55618859e4335c2c420461f13e6116aa7678aa6e473d7b7a58068e46db8606e

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