Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b836f83bf397d82…

MALICIOUS

PDF

98.2 KB Created: 2021-07-07 20:07:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 003cb4d49fc8c1993ba2c757837b69b4 SHA-1: db1bdbe9d92ffa91eb2aacb41673fc18fbfbedb0 SHA-256: 1b836f83bf397d822cca0beca9cdc4d59ae340a39c6187b492002190c9dd311a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, pointing to numerous distinct hosts, many of which appear to be compromised WordPress sites or disposable hosting. The primary purpose seems to be redirecting users to potentially malicious content, aligning with phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9936

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://yogathoitrang.com/quangbasanpham/app/webroot/upload/image/files/rakapoduxerileze.pdf In PDF document text
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1607c71c2e5020---latepimipozugunesumu.pdfIn PDF document text
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a52b3a34c10---67842293921.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/881d16e6066aa24ab418e6e8dac48051/95948273124.pdfIn PDF document text
    • https://arte-salon.ru/upload_picture/roser.pdfIn PDF document text
    • https://www.duffylighting.com/wp-content/plugins/super-forms/uploads/php/files/a9d14c116976fdda9d1a748f6c6b8efc/13879869078.pdfIn PDF document text
    • https://goldenparadisestsimons.com/wp-content/plugins/super-forms/uploads/php/files/7e777e3463e25a74c8fb7d6b4509ae0f/64262279871.pdfIn PDF document text
    • https://jagominum.com/contents//files/15074691553.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/160779f03e567c---jibakipotalopetowuv.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf8e04f1a00---xizariwime.pdfIn PDF document text
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/5cf229b2a4578ee719335145c4bc3a15/bajerijivekepux.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a87e751562a---67927399630.pdfIn PDF document text
    • https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/c6421b9b2b596bc7af990a51adfdb219/guxeweg.pdfIn PDF document text
    • https://growmytruck.com/wp-content/plugins/super-forms/uploads/php/files/6208ab8afa0110ce7964813bfbbb7dfd/rosutubuwabofojume.pdfIn PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be4e7bf17bf---44511298436.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/16090973431e59---salukofexupawisaku.pdfIn PDF document text
    • http://szyldkj.com/luodan/images/userfiles/file/zoligo.pdfIn PDF document text
    • http://takemehometomatoes.com/ckfinder/userfiles/files/pewejofubitudid.pdfIn PDF document text
    • http://s8radziejowice-paszkow.pl/userfiles/file/55202285970.pdfIn PDF document text
    • http://denis-lefebvre-services.com/fichiers/file/24269393958.pdfIn PDF document text
    • https://www.eziblank.com/wp-content/plugins/super-forms/uploads/php/files/ckft52rei6l8bmhu425ghkro85/43825675638.pdfIn PDF document text
    • http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/ce1838e62561ee75088af9ec55ba27eb/92263415274.pdfIn PDF document text
    • http://centronegozi.com/public/vipodidorugev.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=we+are+the+kids+of+americaPDF 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_off00011b15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B15 10676 bytes
SHA-256: fa94179d9bba1674a22dd0a7091267ce3789117b46fd8a7d1b57cdf32014972b
font_01_sfnt_off000133a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133A3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014bb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14BB5 18640 bytes
SHA-256: 46feb945bb7a7d6543fd24df540e186f966c74247f4eac3db35f916ee3ae7457

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