Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6d1514284df2409…

MALICIOUS

PDF

84.7 KB Created: 2021-08-19 21:50:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 7e184802bcc5f8b7bffe58b899eb87dd SHA-1: 3e72229593ae7360440990096c3d4d4533804042 SHA-256: b6d1514284df2409599a345b1ccb52088e8e771557255b1c6bfd79d8c696022c
156 Risk Score

Malware Insights

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

This PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of external links, many pointing to compromised WordPress sites or disposable hosting, indicating it functions as a link farm. The primary purpose appears to be directing users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://cplastik.net/data/cms/file/relewowun.pdf In PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/1607fb2b1e8335---42650584893.pdfIn PDF document text
    • https://faresaldabbous.com/uploads/files/36468778759.pdfIn PDF document text
    • https://bilalyapidekorasyon.com/userfiles/file/7906838835.pdfIn PDF document text
    • http://jarauwerdaenzn.nl/userfiles/file/3652266702.pdfIn PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/160961b09a5a6a---voxujizonasetewatemozewo.pdfIn PDF document text
    • http://huile-de-nigelle.info/userfiles/file/84282647168.pdfIn PDF document text
    • http://allg-gyn.ch/userfiles/file/dadesasolelu.pdfIn PDF document text
    • https://rodolphe-blanchet.fr/Rodolphe/fckeditor/file/munukuguzixavaxiza.pdfIn PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608430b3c7bd9---71672522077.pdfIn PDF document text
    • https://cowichanmusicfestival.com/userfiles/file/77528508503.pdfIn PDF document text
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/d7iutl53sk0rtdcasgqfp6f0qf/bidixoletemixet.pdfIn PDF document text
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/071714ddacdb861b5c09cd578e45df23/98112322944.pdfIn PDF document text
    • https://fellowpeo.com/wp-content/plugins/super-forms/uploads/php/files/cba118333f599b06e0a7fac47e1dacc9/41266866545.pdfIn PDF document text
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b088e39f0bf---65554182089.pdfIn PDF document text
    • http://skrabl.pl/www/rpbd/fck/file/17232615824.pdfIn PDF document text
    • http://rioairporttransfer.com/ckfinder/userfiles/files/gasewamesev.pdfIn PDF document text
    • https://www.blackandwhite-salon.com/wp-content/plugins/super-forms/uploads/php/files/2f765423f1f30d3d8dc6f7148cd846fa/78600291161.pdfIn PDF document text
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/c64ddd27bdb47e03468d7ea688fff7aa/mujuzafafenipusetazojo.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/82171692381.pdfIn PDF document text
    • https://pakianco.ir/data/image/uploads/news/files/wobifo.pdfIn PDF document text
    • http://honda-vo.com/upload/file/pawuzikemik.pdfIn PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/16114a55da669e---90492231728.pdfIn PDF document text
    • http://cjatkinson.com/userimages/wozamujisolef.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=buddha+vandana+gatha+sinhala+pdfPDF 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_off0000e274.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE274 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fa86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA86 19224 bytes
SHA-256: 4c0f599cecfecf91b2363ad3a20c7877b610d42eab0379df784c1fcefe2fb521
font_02_sfnt_off00012aad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AAD 10644 bytes
SHA-256: a5a69c88537de7856fe17e3f00950a043526d885632fee7bdfe097ee208cca3a

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