Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb7243222326a748…

MALICIOUS

PDF

83.8 KB Created: 2021-09-20 06:36:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: f3dab309fa16c1e4646e3786faab2f8d SHA-1: 90cfb8326ff873d162458f6c232bacce417e7fc0 SHA-256: fb7243222326a748a27077e90ac7bf7e8fc20991472a1450546af40bd03326cc
156 Risk Score

Malware Insights

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

The sample was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics indicate the PDF functions as a link farm, directing users to multiple external websites, some hosted on potentially compromised or disposable domains. The presence of numerous unknown URLs suggests a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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 https://huaienclinic.com/uploadpic/files/51264007623.pdf In PDF document text
    • http://gonzagafood.com/userfiles/files/mikunulaxebo.pdfIn PDF document text
    • https://bulgariapools.com/contents/files/46551045678.pdfIn PDF document text
    • http://propack-th.com/image/upload/File/91643214457.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/difujexowubelafifanegaxot.pdfIn PDF document text
    • http://dataction.org/demo/dataction/media/lusuloniselu.pdfIn PDF document text
    • http://tmacfashion.com/ckfinder/userfiles/files/55762148459.pdfIn PDF document text
    • http://moonlightmontessori.com/upload/files/fuxuwuve.pdfIn PDF document text
    • https://horacebatten.com/ckfinder/userfiles/files/29793797392.pdfIn PDF document text
    • https://adtw1.com/ckfinder/userfiles/files/fodawebejisaxuxifojafejo.pdfIn PDF document text
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/16146296b80b56---98089981190.pdfIn PDF document text
    • https://tele-video.ru/upload/files/gapuzadodanelizew.pdfIn PDF document text
    • https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140130a8506b---12246313007.pdfIn PDF document text
    • http://asbufestival.com/uploads/FCK_files/file/jakazusewolutubuziwekixo.pdfIn PDF document text
    • http://eclickapps.in/userfiles/files/84836883225.pdfIn PDF document text
    • http://bortran.com/upload/image/file/20210906023353.pdfIn PDF document text
    • http://shepardinteriordesign.com/rw/upload/file/vilosarupobobuta.pdfIn PDF document text
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16132c6197305a---pidarategabu.pdfIn PDF document text
    • https://horgaszvelem.hu/ckfinder/userfiles/files/makan.pdfIn PDF document text
    • http://www.corazondelsol.es/ckfinder/userfiles/files/bumodaxugoxozebi.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614684a28c109---56109645913.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=music+player+apps+downloadingPDF 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_off0000e395.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE395 10884 bytes
SHA-256: 735236939c0c456f064b3e00fb9793d56275902abcc15c71bd8d8b5adb376e06
font_01_sfnt_off0000fcb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCB5 17268 bytes
SHA-256: 19ec8cf116af6591dcd9e7b63a32ea03069a079679aafd65a2f32d258ca55276
font_02_sfnt_off00012967.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12967 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1