Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8f49355a29df23f…

MALICIOUS

PDF

69.7 KB Created: 2021-09-26 17:27:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 4215dbee4a1e4443de97358556df59c4 SHA-1: 007a0e73954e156d9b66e9a4c1c14954b3bde155 SHA-256: d8f49355a29df23f00fa87aa8ce40f63111c580b23357333352945baa3e1d38b
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing or trojan. Heuristics indicate it functions as a link farm, directing users to multiple external websites, some hosted on compromised CMS platforms. The embedded URLs suggest an attempt to trick users into downloading further malicious content or visiting phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://ozmutludokum.com/userfiles/file/35895357322.pdf In PDF document text
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/ef35bd2e3d2d72660b268bb533e59428/31960939690.pdfIn PDF document text
    • http://ticketsperiodico.com/galeria/files/zikidawarasewasekumoxiri.pdfIn PDF document text
    • https://daiichitravel.com/uploads/news_file/37210154227.pdfIn PDF document text
    • https://vieclamday.com/userfiles/file/jedop.pdfIn PDF document text
    • https://szemvidito.hu/sfwkr/feltoltesek/Images/Image/19471296827.pdfIn PDF document text
    • https://mimpi1pusat.com/contents/files/4647140324.pdfIn PDF document text
    • http://sonnenheizung.ch/fckeditor/editor/images/file/10292531015.pdfIn PDF document text
    • https://qualitycountscleaning.com/wp-content/plugins/super-forms/uploads/php/files/4c762903c2b457d11962b392d271bae7/segidakalufejopegelugeru.pdfIn PDF document text
    • http://farmaciacogliate.it/userfiles/files/55727633282.pdfIn PDF document text
    • http://hqshop24.com/userfiles/file/sujano.pdfIn PDF document text
    • http://stickers-moins-cher.com/userfiles/stickers-moins-cher.com/file/77631333877.pdfIn PDF document text
    • https://divinenine.net/userfiles/file/lusugisisaponukakevevo.pdfIn PDF document text
    • http://onlinemidias.com/ckfinder/userfiles/files/wuwujeviremifura.pdfIn PDF document text
    • http://lawina-radom.pl/files/file/62789155744.pdfIn PDF document text
    • https://maintogelonline.bet/contents/files/fobetafopelagefatugezogoj.pdfIn PDF document text
    • http://hzxgdz.com/images/upload/File/73796464316.pdfIn PDF document text
    • http://www.naturhalles.fr/fckeditor/userfiles/file/39089712023.pdfIn PDF document text
    • http://superazs.ru/images/news/file/kesor.pdfIn PDF document text
    • https://biroestarsa.hu/uploads/file/mipiwe.pdfIn PDF document text
    • http://niezapominajkowo.eu/userfiles/file/todarurinutus.pdfIn PDF document text
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1612f577853c80---83999925306.pdfIn PDF document text
    • http://grimastone.ru/files/32690719949.pdfIn PDF document text
    • http://carsonpokebar.com/uploads/files/47984556106.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=download+launcher+samsung+s10PDF 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_off0000af51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF51 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c768.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC768 10988 bytes
SHA-256: bf77cdf55c2ebabda22ebc911d0a17e561903729ea8d1f57e1b01656e2f071d2
font_02_sfnt_off0000e0a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0A3 15868 bytes
SHA-256: 45747938e19cd2d995dcbff4b42dbddb153e4f71102a10659acf8eb0c075a744