Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b0e4412fe95027c…

MALICIOUS

PDF

94.7 KB Created: 2021-08-22 03:50:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 786b4cde49fd57bce77d76fd49244972 SHA-1: 2f70d84affbda9f3f44425e423318c24e45e8558 SHA-256: 8b0e4412fe95027ca80911af9b78b5bc2a006be89565b575c368e1c005303839
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by ML classifiers and ClamAV as malicious, exhibiting characteristics of a phishing lure. The document body is heavily obfuscated and unreadable, but heuristics indicate it contains a link farm and is presented as a fake invoice or payment lure. The presence of multiple embedded URLs pointing to potentially compromised websites suggests an attempt to redirect the user to malicious content or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://aiaato.com/FileData/ckfinder/files/20210613_F92E16471310C51F.pdf In PDF document text
    • https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/ss63qtmdgvra90dfnp3c3okrat/sopefejigumile.pdfIn PDF document text
    • http://ulv-fogger.ru/d/files/63418995543.pdfIn PDF document text
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080cfd8dba28---87565390931.pdfIn PDF document text
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/b183f2695d3fc2dfc9035421bbc1764a/76688870030.pdfIn PDF document text
    • https://www.natursany.com//ckfinder/userfiles/files/35639468123.pdfIn PDF document text
    • http://burke-gallonfamilyreunion.com/clients/28163/File/97155591675.pdfIn PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c38f5cb19a8---ladajoxiparoso.pdfIn PDF document text
    • http://parentini.it/userfiles/files/laxufidasurobodakaraw.pdfIn PDF document text
    • https://rumusjitu.com/contents//files/96970664219.pdfIn PDF document text
    • http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/1610988d24abff---5304115443.pdfIn PDF document text
    • http://kubkao-kubpla.com/userfiles/files/99459605470.pdfIn PDF document text
    • http://cl-metalparts.com/d/files/21157069747.pdfIn PDF document text
    • http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9b9f346202---20197881125.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/k1mbgcp4d8o78lu46fj26eef31/gagilovogo.pdfIn PDF document text
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/a23830bf68a142904fb387c0362757e2/45399312179.pdfIn PDF document text
    • https://www.westcountrystoves.co.uk/wp-content/plugins/super-forms/uploads/php/files/858ea708990ec21ade9305f2c07855aa/kexisevidufanas.pdfIn PDF document text
    • http://1careglobal.com/upload/files/34628439334.pdfIn PDF document text
    • https://dezsredstvompx.ru/wp-content/plugins/super-forms/uploads/php/files/b35dc7e7906cc4aa0e3e90f0f98eaa54/49368997515.pdfIn PDF document text
    • https://yptea.com/data/fckeditor/files/dimiseronuzojulidudod.pdfIn PDF document text
    • http://dobre-jaja.com/Upload/file/32037438221.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/160742a139a853---wijudojubibi.pdfIn PDF document text
    • https://www.techsrollout.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608723e9c5d97---zotisibawimima.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=donde+puedo+pagar+el+internet+en+casa+telcelPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f359.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF359 10788 bytes
SHA-256: fd20a0fed4b4a06d3464abfec8c80bc70eea0fc7b9880d6283910f5b15babbce
font_01_sfnt_off00010c14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C14 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012426.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12426 18408 bytes
SHA-256: 3963c2cb9c12d9d92af282d62e449aa7e357ba5abdd7fdf89cefa9b469d2ea12
font_03_sfnt_off000153a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x153A8 16344 bytes
SHA-256: 5cd8a120e106fc2d4fc1855603a636a3ce922decfb1b4d98f17a4a5450337c58

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