Malicious PDF — malware analysis report

Static analysis result for SHA-256 788174c085151036…

MALICIOUS

PDF

111.7 KB Created: 2021-09-02 09:28:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 1623968626705a3ffc2c0405f719ecbb SHA-1: 8a502228512632f683070090d4c11f2144006ec9 SHA-256: 788174c085151036ec352ac91a64ff300db007989accd1c4def585e23d01dc80
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many pointing to compromised WordPress sites, indicating it functions as a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution through these links. The document body is unreadable, but the heuristics and URLs confirm a malicious link farm pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/ed6a75f1127b00661039244c03862e19/sezejagofafubokipij.pdf In PDF document text
    • http://sintellect.ru/Repository/file/rolexizugelona.pdfIn PDF document text
    • http://langeline.com/ckeditor/upload/files/guliposuvu.pdfIn PDF document text
    • http://sanfrancescovet.com/userfiles/files/10868974604.pdfIn PDF document text
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606d13117f60d---lozon.pdfIn PDF document text
    • https://bowenpainter.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073beaf1b014---2250169898.pdfIn PDF document text
    • https://xn--i1aam8cb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/18881b8f9d0e9edc726ce4e482faca63/81720155139.pdfIn PDF document text
    • https://engravestone.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c855bf734fe---89485407108.pdfIn PDF document text
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bfc3f5f00fd---zesirem.pdfIn PDF document text
    • https://indacphuc.com/wp-content/plugins/super-forms/uploads/php/files/i7f1gb0sve9jcrj8gjuiu4enig/10624723147.pdfIn PDF document text
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/16100d397f276e---23918172669.pdfIn PDF document text
    • https://bdprescription.com/ci/userfiles/files/14653631137.pdfIn PDF document text
    • https://www.urban-quartz.co.uk/wp-content/plugins/super-forms/uploads/php/files/594edd95bc7be850d2e58f16ef71c106/11583123633.pdfIn PDF document text
    • http://xn--k1akb4c.xn--p1ai/userfiles/file/69423351634.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d5fd075981---nunufuxojajubuzutubetawak.pdfIn PDF document text
    • https://www.mybizwebsites.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b87a8ab302c---91280428955.pdfIn PDF document text
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/160dc2633b6932---dojokamasupefexigew.pdfIn PDF document text
    • http://xn--9d0b102a6wc3y4a.com/sa_upload/userfiles/file/20210614212437.pdfIn PDF document text
    • https://arerp.kr/data/file///22724326588.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608696ab1c215---21432456577.pdfIn PDF document text
    • http://amoy-art.com/Upload/file/kedawuxulekezepapox.pdfIn PDF document text
    • https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/rm7ljns4ibjkbt8shvml1grb2t/64402546082.pdfIn PDF document text
    • http://brianhaymore.com/images/e/file/fuwumejoxem.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=materials+science+in+semiconductor+processingPDF 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_off00015210.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15210 17584 bytes
SHA-256: d25fcbf7d8092363653960b6f1795c5e8d952fdbf0ec7ddfa7938132a777b924
font_01_sfnt_off00017f82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17F82 10952 bytes
SHA-256: 6837d5cf718e717658ad75d7905394373dfc418cf83e1fd0d1b0ba6c580abaa8
font_02_sfnt_off000198a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x198A7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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