Malicious PDF — malware analysis report

Static analysis result for SHA-256 e309fd08965cd61c…

MALICIOUS

PDF

90.2 KB Created: 2021-07-31 04:05:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: fa0ca15cdceed646bea732a7855b57d6 SHA-1: 4cf0b6cdd2d821ac5390d3614a01dc0eab857b86 SHA-256: e309fd08965cd61cacd3c5c85721283bd324faa7bf925f92fd681dfb9461829c
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many pointing to domains associated with compromised WordPress installations or disposable hosting, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery via these links.

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 http://sculecuacumulator.ro/app/webroot/files/userfiles/files/siwuja.pdf In PDF document text
    • http://alemotta.com/resources/original/file/51397296432.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/11de1f93bcbd6879b53d19a5dd5fa928/rotexuroborerofu.pdfIn PDF document text
    • https://xlux.vn/wp-content/plugins/super-forms/uploads/php/files/8ov92ofj3udr1k4clujho20qls/36106968828.pdfIn PDF document text
    • https://interesttour.com/wp-content/plugins/super-forms/uploads/php/files/450d305d1d49d3fd5ba4f1fea1f3c078/wurelivasug.pdfIn PDF document text
    • http://u15.ch/ckfinder/userfiles/files/15443564837.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/7dub7urcte85iia2rdu7n1b5n1/14459186884.pdfIn PDF document text
    • https://casabresciani.it/uploads/file/81890027453.pdfIn PDF document text
    • http://quaint-house.com/images/blog//file/kumupiferotupepomib.pdfIn PDF document text
    • http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cb568b6689d---fanusisitibobipijoxur.pdfIn PDF document text
    • https://bilalyapidekorasyon.com/userfiles/file/89458391106.pdfIn PDF document text
    • https://viettincapital.vn/upload/files/vititifegexa.pdfIn PDF document text
    • https://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/1efddbf33aa75b4eec785e705f95b095/vomox.pdfIn PDF document text
    • http://xn--9p4b29dncp2cc6y.net/upload/fckeditor/file/7316084108.pdfIn PDF document text
    • https://weinquartier.at/wp-content/plugins/super-forms/uploads/php/files/4eb5dbb83eda4e29d03f8a392daa0c41/balabikexorusetiv.pdfIn PDF document text
    • http://www.lifestaralberta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c7df581a76---25262194605.pdfIn PDF document text
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c4008b3f20---sefavad.pdfIn PDF document text
    • http://uptownfallschurch.com/uploads/files/53744088597.pdfIn PDF document text
    • https://srp-galabau-rostock.de/wp-content/plugins/super-forms/uploads/php/files/ucoufgbead9ns8n84ntl8u5eh7/18981090658.pdfIn PDF document text
    • http://dodici12.ru/wp-content/plugins/super-forms/uploads/php/files/bai0kohp24p8ikmkjdf5q86bj4/81349436536.pdfIn PDF document text
    • http://baohanhranghm.com/upload/img/files/50717320483.pdfIn PDF document text
    • https://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/428f1f6eec9993cebdd6b7b0cb299c78/77549736254.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=how+to+get+free+discord+membersPDF 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_off0000f9e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9E0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000111f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111F2 17484 bytes
SHA-256: c19a30293a1b908748cf3ba64ad7729e0f1d37fa10f65b096ff9d69afbb6b906
font_02_sfnt_off00013fa5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13FA5 10724 bytes
SHA-256: b0a6dad9f4795b5f0d8fae03ae550532005ccc97302ea536846f693b85413e93

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