Malicious PDF — malware analysis report

Static analysis result for SHA-256 852a0664319bd9be…

MALICIOUS

PDF

83.1 KB Created: 2021-09-23 00:46:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 15534a943a6abb78f32926cb99e25045 SHA-1: 4d0a7d17a50124a27ada31dfc102bef67c438e29 SHA-256: 852a0664319bd9be3329711c0477245acda4fa71ce7b9a9c43f7de70cff629e0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to multiple external URLs, some of which are hosted on compromised WordPress sites. The presence of numerous links and the use of disposable hosting suggest an attempt to distribute malware or engage in phishing activities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://pixomot.ru/uplcv?utm_term=best+shooting+games+for+android+without+internet PDF link annotation
    • https://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/67db872a2b1e08c8f6023c72d98e451b/67032525380.pdfIn PDF document text
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/16143622fe0e42---50324294698.pdfIn PDF document text
    • https://fokusmedia.com/images/uploads/89711836569.pdfIn PDF document text
    • http://mirsistem.com/depo/sayfaresim/file/4620364175.pdfIn PDF document text
    • https://kapefashion.com/files/files/vizotagijulerenu.pdfIn PDF document text
    • https://www.food-equipment-store.com/fckeditor/uploads/file/32196732010.pdfIn PDF document text
    • http://internet-trade.eu/UserFiles/file/97991343707.pdfIn PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/1614740ef90e87---todagesoxamidabexolove.pdfIn PDF document text
    • https://fruitssupplier.com/app/webroot/img/files/63434690149.pdfIn PDF document text
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142c1e537bb7---73334662158.pdfIn PDF document text
    • http://marcelponjee.nl/ponjeefiles/file/zifajumaxovoradugepe.pdfIn PDF document text
    • https://ganganagardentist.com/userfiles/file/25339012283.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/66ad0aac831c14cf959064d884a803e6/jotonujididet.pdfIn PDF document text
    • http://huzatfokozo.hu/editor_up/tikanogigiditi.pdfIn PDF document text
    • http://imhyuk.com/imhyukeditor/userfile/file/65230509535.pdfIn PDF document text
    • https://apteka-wratislavia.pl/halatecza/userfiles/file/wewepomamino.pdfIn PDF document text
    • http://canvangdientu.com/images/file/nitikemomix.pdfIn PDF document text
    • http://karmakonnect.org/DrumiBhatt/karmakonnect.org/Final/ckeditorimage/files/gugopedi.pdfIn PDF document text
    • http://apart1day.ru/file/wovulekataporexipul.pdfIn PDF document text
    • https://bititechnika.com/uploads/file/kuwufudulijapekusoxamapar.pdfIn PDF document text
    • http://eca.or.th/ckfinder/userfiles/files/21410832477.pdfIn PDF document text
    • http://musiclivemarsala.com/userfiles/files/94932841180.pdfIn PDF document text
    • http://flairpens.ru/uploads/files/31399533938.pdfIn PDF document text
    • http://materialdeestudo.top/userfiles/files/fozazubefewetujadameza.pdfIn PDF document text
    • https://allcreaturesinc.com/files/files/50354839459.pdfIn PDF document text
    • https://millinerandassoc.com/files/file/zuzexazegasukujilo.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e08a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE08A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f8a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8A1 10996 bytes
SHA-256: 1a9e5a3f5b82de16fd3c6f43f9490b32bf05a5bd5c1f90e00fe5eb2466281a71
font_02_sfnt_off000111e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111E1 17148 bytes
SHA-256: 313463fca2622dfdf4174da6894d3ac457fc6ec4d256092e18780bf235ed7542

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