Malicious PDF — malware analysis report

Static analysis result for SHA-256 e5986f2eec6a4148…

MALICIOUS

PDF

86.8 KB Created: 2021-07-23 05:12:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: c8093406d39637ae9bb7d6618b430498 SHA-1: 6e13b2fc56c418c336fac9c164c5d32b51cb772c SHA-256: e5986f2eec6a4148250d9d0b0677eb2fa531f262b5fff14839ece4f77f2e67aa
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It functions as a link farm, containing numerous URLs pointing to compromised WordPress upload directories and other disposable hosting sites. The primary purpose appears to be directing users to malicious content, likely for phishing or malware delivery, aligning with the characteristics of a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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 http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ec435b7511e---libisupuwaverewerizixaxu.pdf In PDF document text
    • http://northwestpixie-bobs.com/clients/e/e1/e1941a3904c49320334fd90e0ed9e852/File/31226938346.pdfIn PDF document text
    • https://churchosonline.com/wp-content/plugins/super-forms/uploads/php/files/5b82ed4525522709c8ef57b76cac66ef/45282830393.pdfIn PDF document text
    • https://cosplay-expo.it/ckfinder/userfiles/files/xofomotagol.pdfIn PDF document text
    • http://humanitool.ru/userfiles/file/18207440275.pdfIn PDF document text
    • https://tennis94.fr/img/pics/files/3538396394.pdfIn PDF document text
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160c86eb05bdcb---18767646628.pdfIn PDF document text
    • https://benchmarktransitions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c888f312a9---91000168432.pdfIn PDF document text
    • http://homeopathyhk.com/files/25644680968.pdfIn PDF document text
    • http://saamfactory.com/wp-content/plugins/super-forms/uploads/php/files/9e148e7522c12f8b605088a85ef44b94/noxewojakex.pdfIn PDF document text
    • https://lescourailleurs.com/upload/editor/file/kefogiwekekuxirefu.pdfIn PDF document text
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/d0adee27c4bfb62dbdc38aaadf41b0b2/fodosuzat.pdfIn PDF document text
    • http://celyroknaterase.sk/editor_uploads/system/files/tugar.pdfIn PDF document text
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c8cd58f2de4---legaredogosafivi.pdfIn PDF document text
    • https://service-panev.com/userfiles/bilipopamewonodekat.pdfIn PDF document text
    • http://worthingtonpark101.com/userimages/jejiwuzu.pdfIn PDF document text
    • http://mvclassof1990.com/clients/8/8c/8ca0ba2c7a07c5cd1f21f9fc323c16c5/File/pilopif.pdfIn PDF document text
    • https://mmszke.hu/files/file/18062217448.pdfIn PDF document text
    • http://busankid.com/webfiles/board/file///wapotemawe.pdfIn PDF document text
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/37u6lufpoc71ng061lhkt0s9tj/87450055118.pdfIn PDF document text
    • http://ccswcd.com/userfiles/file/12672216973.pdfIn PDF document text
    • http://grupogmec.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091f2b308237---tajefenoveboxasupiw.pdfIn PDF document text
    • https://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/sild4vaaveq47pl5q7dloiv373/zijimiza.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=birthday+letter+to+myselfPDF 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_off0000f090.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF090 16748 bytes
SHA-256: bad5817e7765e10c034d44d5d5c4ba5e695658dc63a3a9eae72b8ed8d3795d2b
font_01_sfnt_off00011c3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C3A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013451.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13451 10684 bytes
SHA-256: 03d51fd92c814089a42d6bdab86befe6c25eeff4fa1aab3c78588406309fef10

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