Malicious PDF — malware analysis report

Static analysis result for SHA-256 d9175f83f07c966f…

MALICIOUS

PDF

94.3 KB Created: 2021-08-04 15:57:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 188e91d679e4fca514e85b8553c750d1 SHA-1: 8a23c05403618aacd648d99f50764dd43abc4f9e SHA-256: d9175f83f07c966fcf96af812173683fc647f32f618f19b8bf532f64e1a36fc6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains a link farm pointing to numerous distinct hosts, many of which are hosted on compromised CMS upload storage or disposable domains. The primary purpose appears to be directing users to potentially malicious external sites, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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://www.traitagri-solutions-alternatives.fr/ckfinder/userfiles/files/48140975105.pdf
    • http://yasairamenbar.com/uploads/files/58068619543.pdf
    • http://davisfolk.net/clients/1/1f/1f1070e31f35868a9a13f38ee7dc887f/File/17493270292.pdf
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608daa8708262---kokafofumuju.pdf
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/841bf9376c9d75dd82575a782049f1cb/bikozise.pdf
    • http://ruishikaishi.com/upload/content/files/2021/07/20210716102504.pdf
    • https://www.d-table.com/wp-content/plugins/super-forms/uploads/php/files/582b291e996607bd626a0ae31990ea6e/17608427786.pdf
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/160935774d12aa---kemex.pdf
    • http://cinebuzz.be/uploads/userfiles/files/10471896579.pdf
    • https://renfrewareahealthvillage.ca/ckfinder/userfiles/files/93878740785.pdf
    • http://nuyewrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/6799a7e1987da79dd12e869a54ad0e7f/29449204049.pdf
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607615a975b93---jupapovasomigurid.pdf
    • https://kermiradiatoriai.lt/images/files/40566068465.pdf
    • http://kalmi.ru/upfiles/files/39509930838.pdf
    • http://teerosy.com/ipp/images/uploads/files/somumikawutupofijogoxa.pdf
    • https://mm-podium.ro/userfiles/file/48180588955.pdf
    • https://joyfool.art/wp-content/plugins/super-forms/uploads/php/files/88d61ac7e2d9bdeedeb8a49818e1f589/78834023793.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f007b4c833d---selivafajizekenudokosefis.pdf
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c280e6e2e54---55264109199.pdf
    • https://canvasations.com/wp-content/plugins/super-forms/uploads/php/files/kn0mc5rhl03820ifpp3c9v4r85/vosuroxepaluropezapova.pdf
    • https://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/66ui9jg42om81mchp0686le3e1/wekonuzavufixem.pdf
    • https://leo.tw/upload/ckeditor/files/23494041251.pdf
    • http://clinicacomciencia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608f83a816b2e---bamanozozanegeji.pdf
    • http://aisef.org/uploads/userfiles/file/file/83463004905.pdf
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/7fgqm1arf88pb02mife31d0sns/sosagubegagefotekutaxofi.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=onan+6.5+kw+marine+generator+parts+diagram
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000109dd.bin
be864757f7f2a8245fc5136b38fd239df00908e411a5f7b90ac9b12c9f6941df
pdf-font-stream PDF embedded font (sfnt) at offset 0x109DD 17740 bytes
font_01_sfnt_off00013797.bin
1ce5aa739a75f705a08a4d0b4f907ff32b4ac491d339f9a6ecc204c61cc0157f
pdf-font-stream PDF embedded font (sfnt) at offset 0x13797 11260 bytes
font_02_sfnt_off00015202.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x15202 16792 bytes