Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d3f2b628a07bcc8…

MALICIOUS

PDF

85.4 KB Created: 2021-06-26 05:43:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: c577ec7d31c8f17c8f3bbee1ecada8d1 SHA-1: 7850b0b5910544b1dcfa21e9ae25f9b90b592312 SHA-256: 7d3f2b628a07bcc8f2ab885f0a1755a18d65595bca678cffb1110da1f35bd719
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple compromised or disposable hosting sites, such as drafthe.ru and aldea.work. The presence of numerous external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic strongly suggest a phishing or malware distribution campaign. No scripts were extracted, but the document structure itself is designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://drafthe.ru/uplcv?utm_term=sarcastic+quotes+about+homewreckers PDF link annotation
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/27a092af802e60d588ca57c61de37a5b/bilosiwurelanebapedaf.pdfIn PDF document text
    • http://cheumst.com/upload/fckeditor/file/12077891422.pdfIn PDF document text
    • https://www.charroninc.com/wp-content/plugins/super-forms/uploads/php/files/4db21e960227fb9c9acd786ea82ac1f5/koxizuzofagubafanejoxo.pdfIn PDF document text
    • https://ccveg.org/wp-content/plugins/super-forms/uploads/php/files/fqvprbf7ruj61j2c70mv9455ob/84839342418.pdfIn PDF document text
    • http://stylekd.ru/files/24486244254.pdfIn PDF document text
    • http://transinfosoft.com/userfiles/file/pegawini.pdfIn PDF document text
    • https://majubesar.info/contents//files/newexubu.pdfIn PDF document text
    • http://crystalnymph.by/wp-content/plugins/super-forms/uploads/php/files/bbd25f663c19ed8b646ceb5a095198b1/45494332704.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607756018f7bb---81689989853.pdfIn PDF document text
    • https://www.amiunaorchestra.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c8f2a51a9ad---20617112214.pdfIn PDF document text
    • http://xn--e1aaafipco3bk8gra3b.xn--p1ai/upload_picture/file/76531488923.pdfIn PDF document text
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bac67334f55---pekomulidiretagaful.pdfIn PDF document text
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609201615328e---baziziwavilorisoretafuve.pdfIn PDF document text
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076c352bbae7---67576732925.pdfIn PDF document text
    • https://bjjewels.net/nbloom/fckuploads/file/34178017136.pdfIn PDF document text
    • http://vksraja.in/fckeditor/upload/file/24450090390.pdfIn PDF document text
    • https://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/e8fed9fdd7dc318315e8840b0434a1ac/riwifofadupoxalogolodoxu.pdfIn PDF document text
    • https://www.nosolodespedidas.es/wp-content/plugins/formcraft/file-upload/server/content/files/160a385f08eb8e---kibijawaxunene.pdfIn PDF document text
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16074fbae2a2f0---bekexubuvaretulegid.pdfIn PDF document text
    • http://euro520.net/userfiles/file/16226867681900465769.pdfIn PDF document text
    • https://tehnol.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607817224b65e---70219261794.pdfIn PDF document text
    • https://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/2447f63c686454e7ff6d67d3c5354fe9/78170405615.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088eb7ed783b---52729751163.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_off0000e815.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE815 17724 bytes
SHA-256: 89f740c586b4e3f38fbaae93c6d699b79113d15f7debb4476f4824779993f936
font_01_sfnt_off00011668.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11668 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012e7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E7F 10984 bytes
SHA-256: df40b81c90dc6895fac6309c46a5606819712fb718a51654ef7f4446b2253648

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