Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d118049c0dc5d90…

MALICIOUS

PDF

83.1 KB Created: 2021-09-18 21:23:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: f36463db697ea9527e197808388f9b6b SHA-1: 21efe8258836048f56e80c8c3d4af063b56280eb SHA-256: 7d118049c0dc5d90afea08bdb1f868f288648a662e7fcbbe05cee33caf8b48fa
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which point to compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery through these links. The presence of JavaScript suggests an attempt to execute code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://archism.ru/uplcv?utm_term=o+with+diacritic PDF link annotation
    • http://mcutech.net/upload/2021/09/file/16318042941952853296.pdfIn PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e5f77d2d7c---jifepuzibufel.pdfIn PDF document text
    • http://phone-server.com/userfiles/file/31108330319.pdfIn PDF document text
    • https://www.lipca.com/ckfinder/userfiles/files/rukebogexulinesamutij.pdfIn PDF document text
    • https://perfecthospital.net/ckfinder/userfiles/files/ligovopus.pdfIn PDF document text
    • http://jinanxintiandi.com/userfiles/files/kanajalabarurasivajone.pdfIn PDF document text
    • http://bienchidan.org/uploads/files/tisagomogakukak.pdfIn PDF document text
    • https://akproauto.net/nbloom/fckuploads/file/fazuvaweretupo.pdfIn PDF document text
    • http://naso10.com/userData/board/file/22177724963.pdfIn PDF document text
    • https://ropaalmayoreo.com/images/userfiles/file/mebogovevapadol.pdfIn PDF document text
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16137a04a4248c---bamuwixufererizobazolop.pdfIn PDF document text
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/161417baf86ea8---duwigagofozaromaw.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16140e7d0d617d---lirusufuzigebixixasoter.pdfIn PDF document text
    • http://guitarenko.fr/img/files/kuvegexijebapodi.pdfIn PDF document text
    • https://bonaparte.cappencms.com/templates/files/92671475021.pdfIn PDF document text
    • http://goldnumber.info/userfiles/file/jesarufipekadedud.pdfIn PDF document text
    • http://xn--80age2amlc.xn--80adxhks/pics/images/file/nexubidezepuxogutivi.pdfIn PDF document text
    • http://balletpanov.com/uploads/files/425082291.pdfIn PDF document text
    • http://kpdb.org/userfiles/files/26812068706.pdfIn PDF document text
    • http://trieuduong.com/images/Download/40051752382.pdfIn PDF document text
    • http://bakefruit.com/uploads/files/202109021658101834.pdfIn PDF document text
    • http://euhoca.com/js/ckfinder/userfiles/files/zuzegumupomakisukor.pdfIn PDF document text
    • http://radecznica.pl/userfiles/file/97145565730.pdfIn PDF document text
    • https://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/13499bee6bb4318df7d531d11501dfd5/69929214933.pdfIn PDF document text
    • http://dubilex.com/userfiles/files/tipifovelebi.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_off0000d5d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5D3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ede5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDE5 22436 bytes
SHA-256: 3df90fe9be0f2ea30f6807a2ddad5f368a69aa354ec193dbab4d67bef14e1abc
font_02_sfnt_off0001285c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1285C 10008 bytes
SHA-256: a2598861a6c9bcc2c3f1ac10a6f4d3bf26613ce8cb0c2bfce994ad3c1d596afd

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