Malicious PDF — malware analysis report

Static analysis result for SHA-256 361831a392825f85…

MALICIOUS

PDF

87.4 KB Created: 2021-07-02 15:06:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: d790144b86bb3b90722b0b0385e0c59c SHA-1: b757bee290a39a5e2584002b58d71bc4c8ec463f SHA-256: 361831a392825f852aad531375f9e84d0876a8f960ab20586d4c53ed9f3ab618
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress sites, indicating a link farm designed to host malicious content or phishing pages. The ML classifier and ClamAV detection strongly suggest malicious intent, specifically identified as a phishing trojan. While no scripts were directly extracted, the PDF structure and link farm behavior are indicative of a phishing or malware distribution lure, likely delivered via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/701327afe2ed563db79bd154a7661b0d/silopebebuj.pdf In PDF document text
    • http://bezpieczna-strefa.pl/wp-content/plugins/super-forms/uploads/php/files/d6ff05848d1c8dee0ec4da3edd442b3e/34318456228.pdfIn PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/1609ca220c42fd---loxozopuzigedu.pdfIn PDF document text
    • http://www.gainerwindows.ca/wp-content/plugins/super-forms/uploads/php/files/kfbrouki17r2ll6qlkvgqm28v0/33543881920.pdfIn PDF document text
    • https://orkhaconstruction.com/wp-content/plugins/super-forms/uploads/php/files/174fdkb9dbk96pj987e6fftd1o/nopupifanemuwimabobo.pdfIn PDF document text
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/c6935f1ac2f5d0331c1649c6a53e462b/41433291997.pdfIn PDF document text
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/160755f124be00---67336195154.pdfIn PDF document text
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/c95158ab955b4ec7a9d050d3e8c4f738/89751493907.pdfIn PDF document text
    • https://lokmangal.co.in/wp-content/plugins/super-forms/uploads/php/files/796f1c267fabedee53ebf02b3ec308aa/gukesosozatibawurimax.pdfIn PDF document text
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/83o5kbbq81omc9psrcv157mic7/96948020583.pdfIn PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607f03a01606a---68185798200.pdfIn PDF document text
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/160bb0f7348b6d---5546160548.pdfIn PDF document text
    • https://svingenieria.cl/userfiles/file/siralegojukeledebojusi.pdfIn PDF document text
    • http://okulsanmalatya.com/imgup/file/rawazoji.pdfIn PDF document text
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/c8b8c9897b10f50286758b82f17fc40b/pawixizi.pdfIn PDF document text
    • http://www.canadavisaservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e44df7a819---mokaded.pdfIn PDF document text
    • http://garmagostaran.com/Upload/file/32306712201.pdfIn PDF document text
    • http://diclenakliyat.com/userfiles/file/17109325560.pdfIn PDF document text
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082d5094d0e1---19714068226.pdfIn PDF document text
    • http://madmojo.com/fckupload/file/51114015870.pdfIn PDF document text
    • http://bigpictureresources.com/userfilesbigpicture/file/bafuviz.pdfIn PDF document text
    • https://www.charityweiss.de/wp-content/plugins/formcraft/file-upload/server/content/files/16079eb066ef22---14067357277.pdfIn PDF document text
    • https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/1vinqj69kf7h0r1bhhe5qejj0f/tebuw.pdfIn PDF document text
    • http://beijinghuojia.cn/userfiles/file/90192252155.pdfIn PDF document text
    • https://hafa-verein.de/wp-content/plugins/super-forms/uploads/php/files/21f3e36646872bd89b8064bb0a874766/31538572955.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=upcoming+mcu+movies+and+showsPDF 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_off0000efb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFB3 17592 bytes
SHA-256: 66d7077152a3da087f36c90a4ae5d54a298bbacb16e976bc68787d6731bab1ac
font_01_sfnt_off00011dc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DC4 10976 bytes
SHA-256: 39643b1f8e972e937cdb3fdd74da841961f4a6af5963fa8c668803e346be8c98
font_02_sfnt_off000136e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136E4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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