Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8c204590e1b2600…

MALICIOUS

PDF

82.3 KB Created: 2021-09-12 07:16:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 6735166c97f0790d6038176faa1b6599 SHA-1: 1260fd426643997d450cf248e77dc6fbb18a9ad4 SHA-256: f8c204590e1b2600f2333361bea3494c2ba71adca00a091655296c479897a2c3
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised CMS uploads and disposable hosting, characteristic of a link farm designed to lure users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://burchiellati.com/file_fck/file/tasozizi.pdf In PDF document text
    • http://mgtofubbq.com/uploads/files/83414226046.pdfIn PDF document text
    • https://totalsewa.com/userfiles/file/rovegubimilugogezumeloram.pdfIn PDF document text
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16135d953b55cf---jadetobumuvadip.pdfIn PDF document text
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/16132ad6950927---95415580728.pdfIn PDF document text
    • http://menifee.hanasushichoice.com/uploads/files/85994313791.pdfIn PDF document text
    • http://bluecreator.biz/ckfinder/userfiles/files/41435022809.pdfIn PDF document text
    • https://momentous-inst.com/uploads/image/files/bafesitujekaxugif.pdfIn PDF document text
    • http://nyett.hk/uploads/news/files/51807353.pdfIn PDF document text
    • http://nedirajtebosnu.net/userfiles/file/gigabukofitesuzunokosat.pdfIn PDF document text
    • https://rts-wm.com/ckfinder/userfiles/files/vozanuxiworuvopod.pdfIn PDF document text
    • https://www.tratedu.net/ssss2018/assets/143ad273/ckfinder/core/connector/php/upload/userfiles/files/9d358d3de3303ad938d17b544f927113.pdfIn PDF document text
    • http://ducnhua.com/upload/files/31768693326.pdfIn PDF document text
    • http://recit-de-vie.fr/userfiles/file/dujototupaginizofovigep.pdfIn PDF document text
    • http://thaiboxes.com/piceditor/file/50722697838.pdfIn PDF document text
    • http://freeorden.com/media/file/wugufafenazezetul.pdfIn PDF document text
    • https://rwd1.thadv.com/upload/files/89822780744.pdfIn PDF document text
    • http://sinoorchids.com/image/file/55003924874.pdfIn PDF document text
    • http://qhchemicalsfeed.com/upload/files/sebanobi.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/79vgm8mfilkm69ovtegvpkal47/13365962635.pdfIn PDF document text
    • https://hsse.cl/files/42549081485.pdfIn PDF document text
    • https://kubermatkaplay.com/ckfinder/userfiles/files/zumosofefiparawaj.pdfIn PDF document text
    • http://cetinelektrik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1613aace052609---55329855676.pdfIn PDF document text
    • https://thefencedocumentary.com/adminfiles/file/wojexuxolaxajowe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=50+shades+darker+full+movie+download+filmywapPDF 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_off0000d9aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9AA 11284 bytes
SHA-256: 6de48141e1289afc98ae0d3b9173b5db5649b03794462103ef684dbf57fba3e8
font_01_sfnt_off0000f406.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF406 18388 bytes
SHA-256: a8dfb396b9af12aca3517c1b8629983def59fb07cd6e66e659a1981de72bbcbd
font_02_sfnt_off0001236a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1236A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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