Malicious PDF — malware analysis report

Static analysis result for SHA-256 46c81458a3d7ae83…

MALICIOUS

PDF

80.2 KB Created: 2021-07-06 14:26:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 7263b350781d7cac8807ad8511dd958e SHA-1: 08f3bfdce13658a91a497dc753aa60d07d7d505f SHA-256: 46c81458a3d7ae83aa86e86e1b8b288df90637ae86d33e36645abd54a6af96d5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ML classifiers and ClamAV as malicious. Heuristics indicate it functions as a link farm, pointing to compromised CMS upload storage and disposable hosting. While no scripts were directly extracted, the PDF structure and embedded URLs suggest an attempt to redirect users to malicious sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/815b977085c622ffc5b05b3846dac23b/wixepukedovanoxalixisip.pdf In PDF document text
    • http://incucinaconalberta.com/userfiles/files/purosivimopen.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16078fdef06a4e---jevikatademafuduwuxu.pdfIn PDF document text
    • http://webscape.co.bw/wp-content/plugins/formcraft/file-upload/server/content/files/160a97191ef70c---17558793765.pdfIn PDF document text
    • https://cvenhancer.com/wp-content/plugins/super-forms/uploads/php/files/6f71a66758c7dd79e9dfa11419a8a188/76282195746.pdfIn PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d0bb8b92d1---71464728179.pdfIn PDF document text
    • https://shining4u.com/wp-content/plugins/super-forms/uploads/php/files/ae04621b0668f443b9d8e4a458c37b0c/4399566819.pdfIn PDF document text
    • http://tryinvest.eu/userfiles/files/22473154114.pdfIn PDF document text
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/1608ea0307cf3c---laxomawugisesof.pdfIn PDF document text
    • https://www.lorenzofranzone.it/wp-content/plugins/super-forms/uploads/php/files/8467c69add0f1b7105f86af5488ea3da/42269426279.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ff3e3a472d---nowugenemaforajox.pdfIn PDF document text
    • https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606dcafa69da5---8495509343.pdfIn PDF document text
    • https://manuscripthandler.com/userfiles/file/80003716127.pdfIn PDF document text
    • http://szao-spb.ru/images/news/file/92182002850.pdfIn PDF document text
    • http://payassistinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071904c72857---gotojerebapejoderufurifo.pdfIn PDF document text
    • https://balajihighfields.in/userfiles/file/47176855175.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c15fe545c3b---gevitojezeruse.pdfIn PDF document text
    • http://abw10thstreetne.com/uploads/files/satarufunafu.pdfIn PDF document text
    • https://kimtuong.vn/isc/public/files/fckupload/file/xurafoze.pdfIn PDF document text
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/16097dff4c3a97---5759768731.pdfIn PDF document text
    • http://nfc.soo.jp/file/ladufoxibujeweroze.pdfIn PDF document text
    • https://costumeworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e11c8d7784---dajewapa.pdfIn PDF document text
    • https://englewoodgrassfarm.com/wp-content/plugins/super-forms/uploads/php/files/bfd0ff6b8ff9d2911302b35b6cd3794f/vuvidez.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/160b5b1347ac45---27269151951.pdfIn PDF document text
    • http://aifamilyreunion.com/clients/59202/File/69663469184.pdfIn PDF document text
    • https://www.simcoerecovery.net/wp-content/plugins/super-forms/uploads/php/files/gdumr8lh3r9a9pbttf4idjakq6/begomikorakifevexuw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=orion+business+innovationPDF 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_off0000d639.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD639 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ee4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE4B 17240 bytes
SHA-256: c0e73ea098577168566c87bbf40f273dcdc946cc21286536e169af6c832182f0
font_02_sfnt_off00011bd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BD7 10388 bytes
SHA-256: 4261cfb666eee0c2b0bf7091bf90b127550adde89989b141a68bfa9729a83a62