Malicious PDF — malware analysis report

Static analysis result for SHA-256 663e868e2f06bc38…

MALICIOUS

PDF

122.7 KB Created: 2021-06-19 00:00:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: f8a5897e738c7cdbb4b947d186ec15f4 SHA-1: 501a2a13c7a24b70adf274e9165a616d58fad1a9 SHA-256: 663e868e2f06bc385e9ee1588ebf4b40bc7ac6e7e8119fc63c17cf2afaf90951
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains a link farm pointing to multiple compromised WordPress sites, suggesting an attempt to distribute further malicious content or phish users. The document body, though heavily obfuscated, appears to be a lure for an 'Everflo service manual'. No scripts were extracted, but the presence of numerous external links and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic strongly suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/2b87dc2a6ed20fa1c2b5bc15c054aa0a/94809392592.pdf In PDF document text
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/qe76m6ra48pdqpgjemqphhgqo2/63524274868.pdfIn PDF document text
    • http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/160901722194f6---sujabokujolif.pdfIn PDF document text
    • https://europeancustomtailor.com/wp-content/plugins/super-forms/uploads/php/files/cd27b66b572d750bd781901fd28db669/livapepudukamag.pdfIn PDF document text
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/cpov3p474qfjvv2hihbk5icitq/mexajuvaxerazaj.pdfIn PDF document text
    • http://yuanyoujie.vip/userfiles/file/siridazivozunarosume.pdfIn PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607e13fa87433---zifupobetoxeta.pdfIn PDF document text
    • http://adabaskimerkezi.com/upload/file/95526932124.pdfIn PDF document text
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16076515e80908---lanazazibubibe.pdfIn PDF document text
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b2f54bd196---kezefowejovebimub.pdfIn PDF document text
    • https://n95america.com/wp-content/plugins/super-forms/uploads/php/files/c0be4272016777a0157a281b1839fd91/ponipumoweluzu.pdfIn PDF document text
    • https://www.alphaveneers.com/wp-content/plugins/super-forms/uploads/php/files/74689a368f9950fa5c6d3001c0dac4e8/79408169746.pdfIn PDF document text
    • https://nepalimodelagency.com/userfiles/file/33765285063.pdfIn PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/1607e715dcaeaf---5679604791.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a13a9c2e331---gajoderuwerazedilelinuti.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=everflo+service+manual+1038571PDF 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://scripts.sil.org/OFLIn PDF document text
    • http://www.geocities.com/mitra_anirban/hobbies.htmGNUIn PDF document text
    • http://www.gnu.org/copyleft/gpl.htmRegularIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 6

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00016228.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16228 2960 bytes
SHA-256: 3a99bfcc8a6322cb1f5d9dd0c76c95525b0630114fc12c53a342d41e6b6e0e01
font_01_sfnt_off00016c98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16C98 5604 bytes
SHA-256: 33a9581c84b82146799889921215bda2508f0d46d42d91eb104f860c87e8c4e0
font_02_sfnt_off00017f91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17F91 3852 bytes
SHA-256: bec7a4ef2b6abc0f8b4d5cd61dcb85e73abff0d238454ecaed4d8568c9b8f0d0
font_03_sfnt_off00018b91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18B91 13316 bytes
SHA-256: 798be7150c8789d8226a8633a6f7c3a6e8ca85fab592ff15d9fb657dc232a17c
font_04_sfnt_off0001b8aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B8AA 16300 bytes
SHA-256: 4d001c44ee568b84a01e4999863ef68bd1ceb589194ef344f170d3cd1e5a8ca7
font_05_sfnt_off0001ce68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1CE68 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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