Malicious PDF — malware analysis report

Static analysis result for SHA-256 5dffcd82e0fc5445…

MALICIOUS

PDF

226.8 KB Created: 2021-06-30 03:57:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: d09413e1073246ff283bf70b1b349875 SHA-1: 1a488a527b880ca7eada374775b3a2f920da9baa SHA-256: 5dffcd82e0fc54454cf2647c3c7adb72e90b33d1a53870b2b86bf2f9279adc52
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains numerous URLs pointing to compromised WordPress upload directories, suggesting a phishing or credential harvesting attempt. The PDF structure and embedded links indicate an attempt to redirect the user to malicious sites, likely to download further payloads or steal information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9852

Heuristics 5

  • 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.
  • 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://philabc.ru/uplcv?utm_term=roger+federer+playing+tennis PDF link annotation
    • https://www.analfissur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a4d253b737---fikabefe.pdfIn PDF document text
    • http://www.pilonidalsinus.gen.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1607d57896e546---1428954626.pdfIn PDF document text
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086e8e1f3d19---medojerel.pdfIn PDF document text
    • http://dh-cell.com/ckfinder/userfiles/files/38184609138.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8ef77e5153---notejorunebavezetuximu.pdfIn PDF document text
    • http://skup-laptopow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b5659c3b7a---wakagiluwoku.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16074bde011dc6---71114513056.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070d68c1f38a---fusegabogogalatatojefek.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/uj9a5ckbchvm2ck20dc8k3vjb3/27657133800.pdfIn PDF document text
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a1ca264be65---70210038271.pdfIn PDF document text
    • https://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/82379cf6718f3992df722e4a9dbdb863/wusekeruredufifon.pdfIn PDF document text
    • https://conexus-study-abroad-travel.com/ckfinder/userfiles/file/gojezoluburamabi.pdfIn PDF document text
    • http://mynigaoe.com/upload/file/20210524090237.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074a7ee2c231---8210355684.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/6cqlsq6go1so8gbokn3col9di0/9185752629.pdfIn PDF document text
    • https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/498838a22785efcc813989bb2c8b79a7/nabikepa.pdfIn PDF document text
    • https://malimbe.africa/wp-content/plugins/super-forms/uploads/php/files/825e4656daea5bbf72a387b433bc98c8/49773411973.pdfIn PDF document text
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/9eac99cfd149ddefebc02ee1e0f33259/toxewiriravemagapuk.pdfIn PDF document text
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bd93ad4d63---34861849056.pdfIn PDF document text
    • http://danburyhighclassof1961.com/clients/b/b4/b42d7d7907ff1a67dd6fd366dd3c6775/File/280414802.pdfIn PDF document text
    • http://fcv-bo.org/data/fcv-bo/userfiles/file/51036944960.pdfIn PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16083970a4e722---lukexosakomowu.pdfIn PDF document text
    • https://www.cpro.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16070643dca19b---dilel.pdfIn PDF document text
    • http://kopdesign.nl/userfiles/file/tezabijotetix.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_off000314a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x314A2 10832 bytes
SHA-256: bd5d3d2c7fd810f8d094ec918c703c745d9680bfc20d997723502114feb9468f
font_01_sfnt_off00032d8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x32D8C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0003459e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3459E 22012 bytes
SHA-256: cf236c06a4b51d0fc57575b0c3a530e189d052e9fd57638660e08e302cb40985