Malicious PDF — malware analysis report

Static analysis result for SHA-256 541b10ce61044df2…

MALICIOUS

PDF

90.6 KB Created: 2021-07-14 00:46:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 7a5201157da34bcf1a37e4ec6614df96 SHA-1: da713055f9141cb9295fa327a5e22d0bf92993ad SHA-256: 541b10ce61044df2a3eb38bc1fde2dc8232cb84cca7da071a451ed9424507b31
156 Risk Score

Malware Insights

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

This PDF was identified as malicious by ML classifiers and ClamAV, indicating a phishing or malware distribution campaign. It functions as a link farm, with numerous embedded URLs pointing to other PDFs hosted on compromised websites or disposable domains. The use of 'utm_term' parameters suggests an attempt to track user engagement with these lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9924

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 https://krisoc.ru/uplcv?utm_term=pocketbook+touch+hd+3+pdf PDF link annotation
    • http://radio-salsa.com/php/rs/filesupload/file/mijowunonede.pdfIn PDF document text
    • https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/vi7ss1tche4ba87aukkot2cpuf/lipomigerukiwunubafaxego.pdfIn PDF document text
    • https://rittenhousesmiles.com/wp-content/plugins/super-forms/uploads/php/files/ba45d0065be3bc9d16cf15cfa3d1b154/26088493748.pdfIn PDF document text
    • https://gradeagroup.com/wp-content/plugins/super-forms/uploads/php/files/n78s5hh8jkthu0n6qgdg0g8hsf/jurugirusogexefuj.pdfIn PDF document text
    • https://www.sesc.com.ua/wp-content/plugins/super-forms/uploads/php/files/278i9h05g1q8beppi6i0koe424/nepusazovefus.pdfIn PDF document text
    • http://anhuizpyy.com/upload_fck/file/2021-5-10/20210510031241393820.pdfIn PDF document text
    • http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/7495885441473cd1decdaff27c041261/11127418155.pdfIn PDF document text
    • http://ovartec.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607db834bfa4e---80383022803.pdfIn PDF document text
    • http://hjtech.org/admin/upfile/file/tesikenatuvarapun.pdfIn PDF document text
    • https://ags-car.com/upload/files/tubapadem.pdfIn PDF document text
    • http://rockhouseschool.com/rockhouse/uploads/files/voxabajanetije.pdfIn PDF document text
    • http://teckim.it/themes/userfiles//files/41929399621.pdfIn PDF document text
    • https://mvpartners.be/images/uploadedimages/file/fogim.pdfIn PDF document text
    • https://llsindia.in/FCKeditor/file/47870515151.pdfIn PDF document text
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/160a31a2d97ef5---2635702169.pdfIn PDF document text
    • https://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/gktcc8k19lpfr437f5eatuvn5k/nafelelelumaxe.pdfIn PDF document text
    • https://pluviaterra.mx/wp-content/plugins/super-forms/uploads/php/files/9941ab29ff8dcab7cc9ca34178e87c35/gowuvoguwozevuroxopif.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/f77be0697670a8198d1d432cb376465f/depalesakuxetodekifewa.pdfIn PDF document text
    • http://obasekiestates.com/UserFiles/file/zapazijejugobomonodu.pdfIn PDF document text
    • http://aptatravel.com/clients/4/48/489dad2d2d8436d4c085fc0ccdc2d1b3/File/26195379135.pdfIn PDF document text
    • http://tlxzkj.com/uploads/file/042151344575.pdfIn PDF document text
    • https://bestofbucerias.com/upload/file/zizik.pdfIn PDF document text
    • http://panyuchen.com/ckfinder/userfiles/site_eachfun_com/files/lelew.pdfIn PDF document text
    • http://xn--22cjbbm2eyae3ehabdb4kqdtae3dxnnc1fhf.com/user_img/files/roroxulabarojuxoxuv.pdfIn PDF document text
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d977.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD977 10548 bytes
SHA-256: 11c845604b347129444a06505ad3b2bbca571eecc3cbdadf7e50a8ee953ca949
font_01_sfnt_off0000f17e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF17E 24364 bytes
SHA-256: c191e30d143e8fdec2a71a198529ffb9e563942dfb9b43343f65ed702844807f
font_02_sfnt_off00012e64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E64 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00014675.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14675 16348 bytes
SHA-256: fdc3f250e16d4eeaac0151c08e1678493ac6cc67090af3137bc700c4cd553891

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