Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8fbb85c5b8cc368…

MALICIOUS

PDF

103.4 KB Created: 2021-07-25 13:54:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 0ac37a5550b7c250f48c234789063547 SHA-1: c0a9bd3a093f8d34db87458189f2cc159a1c0de5 SHA-256: b8fbb85c5b8cc368d8ab82efd0954b898efddcdbdfb2017ca5aa3028333c0d39
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically identified as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple distinct hosts, many of which appear to be compromised WordPress sites or disposable hosting. The embedded URLs suggest an attempt to distribute further malicious content or conduct phishing operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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://maconlux.ovh/userfiles/files/4554965439.pdf In PDF document text
    • http://ttlh.vn/storage/ckfinder/files/70886057628.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/1607d4f7d5e04f---19732024494.pdfIn PDF document text
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/4c54d45a4ccfa513c75811d80011c60b/53110146110.pdfIn PDF document text
    • http://stalmost.pl/userfiles/file/wujazekolagare.pdfIn PDF document text
    • https://pankalconstructora.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af992b21b0f---60934595538.pdfIn PDF document text
    • http://cricalliance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160983f830ce0e---12800013783.pdfIn PDF document text
    • https://edukiya.com/wp-content/plugins/super-forms/uploads/php/files/4ce86047c1109d5478142ccb0b8263c6/26686630886.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160a41c7674acf---dezax.pdfIn PDF document text
    • https://dmvassociates.com/wp-content/plugins/super-forms/uploads/php/files/80db98d79a32a379953ec919acd21b38/19673986357.pdfIn PDF document text
    • http://artin-intranet.com/ckupload/files/76414038146.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/opsaepba24bb3jh88d28jcfsp2/jopalojorujemajuved.pdfIn PDF document text
    • http://niestachow.pl/data/aktualnosci_imgs/file/16047660900.pdfIn PDF document text
    • https://aadhaarretail.com/administrator/imagetemp/file/4713506017.pdfIn PDF document text
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e4c6d3dc8fd---titizilupajerudirot.pdfIn PDF document text
    • http://tourister.kr/userfiles/file/87101522937.pdfIn PDF document text
    • http://litho-and-co.fr/ckeditor/upload/files/mepuja.pdfIn PDF document text
    • http://enjoybowlramenandpoke.com/uploads/files/57291442135.pdfIn PDF document text
    • http://verkaufs-akademie.com/userfiles/file/46674015554.pdfIn PDF document text
    • http://globalquestconsulting.com/userfiles/files/24266253473.pdfIn PDF document text
    • http://xn--80aamdqpfpr.xn--p1ai/upload_picture/47897165575.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a565a072009---64156366108.pdfIn PDF document text
    • http://amblesidewindermere.ca/fckuploads/images/file/ridaxetapupuvujadupod.pdfIn PDF document text
    • http://hrzservices.com/uploadfiles/file/lilomuzaxoratukesov.pdfIn PDF document text
    • https://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d97baec13a---gajemarejibuz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=bubble+shooter+game+mod+apkPDF 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_off00013223.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13223 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00014a3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14A3A 11028 bytes
SHA-256: 4d5c0ff48a526fbfa0c93f307854ae85adb3c05bff664a8063b6535b042b1ce2
font_02_sfnt_off0001638d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1638D 16636 bytes
SHA-256: ad11655b06677ebafc795318cf94b71a354783bf4df541a1478610ce089dad29

Open this report in the interactive analyzer, or submit your own file for analysis.