Malicious PDF — malware analysis report

Static analysis result for SHA-256 891e3504b393e0a9…

MALICIOUS

PDF

90.8 KB Created: 2021-06-27 04:05:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 05125589dfe221ec91d9fad8f4745350 SHA-1: 97ec623b9680922d8e8d34b46917b22130fa6094 SHA-256: 891e3504b393e0a9de562b92e68ff9259dce23324d652a5a5fab29c8388ebe15
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1553.004 Security Software Blocking

This PDF document was flagged by a machine learning classifier and ClamAV as malicious, indicating it is likely a phishing or trojan delivery mechanism. The document contains a high-risk heuristic for instructing users to disable security software, which is a common tactic to bypass defenses. While no scripts were extracted, the presence of numerous URLs, some hosted on compromised CMS platforms, suggests a phishing lure or a link farm designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Security software disable instruction high SE_SECURITY_BYPASS
    Document instructs the user to disable antivirus or security software — unusual for ordinary documents and high-risk in an unsolicited file
  • 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://kolbandibileklik.com/resimler/files/sumezasuladedesemetuf.pdf In PDF document text
    • https://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/d71730682daee5cc05849c127a9afc8a/kopazivuwobimeba.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/jagazifefawobowemifotegat.pdfIn PDF document text
    • http://www.maderas-navarro.com/ckfinder/userfiles/files/gadotatuf.pdfIn PDF document text
    • http://anonelectronics.com/admin/fckeditor/editor/filemanager/connectors/php/upload_jpg/file/202105180103283025.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/fc5dd5f331aacd77a7d1d781180a6e84/39516055280.pdfIn PDF document text
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/f4f9f2611a04d3c0e02dc8b928712209/13042011894.pdfIn PDF document text
    • https://www.hausbootgeiseltalsee.de/wp-content/plugins/super-forms/uploads/php/files/jgggqgrnuu6dcj8bcaqtckfl8r/resugasutikitapere.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160d4573235875---ratow.pdfIn PDF document text
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/160872978aa0b8---ziguvewolekadiz.pdfIn PDF document text
    • https://www.chartsunlimited.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/1606d11c4e985f---40581853115.pdfIn PDF document text
    • https://visaonline-vn.com/wp-content/plugins/super-forms/uploads/php/files/g6433uqgpurvi0sqc16i03mnfl/84129448709.pdfIn PDF document text
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607986cdc43cb---temafatujibiku.pdfIn PDF document text
    • http://spreewaldatelier.de/img/editor/file/81050966206.pdfIn PDF document text
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b5d0f9732e---vatuguwi.pdfIn PDF document text
    • https://www.okcfarmersmarket.com/wp-content/plugins/super-forms/uploads/php/files/429a4da193b8bcac937d79ad24858712/jevijoxanajidorovinagon.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/1608a2ca07f38c---titofezuwevaxal.pdfIn PDF document text
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/526bda2258ef8fff1b7d24dd6fe2c5ad/39401547431.pdfIn PDF document text
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/803a5bf5d89f221baa2b815b6c2b4e63/jesawe.pdfIn PDF document text
    • https://leosservices.com/userfiles/file/12367100704.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9221483a0c---58289891688.pdfIn PDF document text
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608512ebebc9c---medotebunubomubozozidaz.pdfIn PDF document text
    • http://ylgems.com/file_media/file_image/file/gunisunogagonoxebag.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078de36970af---panugideluni.pdfIn PDF document text
    • http://pappteam.hu/userfiles/file/34411121238.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=disk+drill+activation+code+for+windowsPDF 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_off0000ff17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF17 17828 bytes
SHA-256: e0ae72322ae90ae6e4ed0b320676dfffb61710213f15cc5a8f4aed5a0d99d27d
font_01_sfnt_off00012d22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D22 10716 bytes
SHA-256: 4928299ec527c539d7440aa9b77c41d1261f67d911112d4534af78637f497971
font_02_sfnt_off000145ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x145EE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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