Malicious PDF — malware analysis report

Static analysis result for SHA-256 97de2a527d616838…

MALICIOUS

PDF

84.8 KB Created: 2021-09-02 06:37:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 0db375418f8f18a0bf75c0a4e19f9612 SHA-1: e9060dcbf90a16a51d6a36e4874ca2d6293679a4 SHA-256: 97de2a527d6168387e8f1fe938ab19291aeb3c3fd2193ec79d212c8234c5fb5e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URLs, many hosted on compromised CMS upload storage, suggesting a link farm designed to redirect users to potentially malicious content. The presence of embedded URLs and the nature of the heuristics point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://chcial.ru/uplcv?utm_term=self+introduction+essay+example PDF link annotation
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16072d97818929---18444758629.pdfIn PDF document text
    • http://j1medical.com/uploaded/file/zoxudadalalurewejapo.pdfIn PDF document text
    • https://greenline.bg/userfiles/file/buvexuxefup.pdfIn PDF document text
    • http://princeverma.in/uploads/files/12914693126.pdfIn PDF document text
    • https://wemservice.com/ckfinder/userfiles/files/botipefelipuvunolim.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/r9pv4vc6utevcs4vjvn7mrk3q2/39015020079.pdfIn PDF document text
    • http://museodegliarazzimarsala.com/userfiles/files/59643534546.pdfIn PDF document text
    • http://partnerplus30.ru/images/fornews/files/43897989231.pdfIn PDF document text
    • http://dobrejaja.com/Upload/file/puzadugapazutum.pdfIn PDF document text
    • http://asupuro.com/upload/save_image/files/vafajivefepomivinaxu.pdfIn PDF document text
    • https://aduanaldelvalle.com/userfiles/file/30262649379.pdfIn PDF document text
    • https://sandipkumardutta.com/ckfinder/userfiles/files/muxalunaxegalan.pdfIn PDF document text
    • https://nbcmedia.vn/ckfinder/userfiles/files/93768800719.pdfIn PDF document text
    • https://actioncoach.com.my/wp-content/plugins/formcraft/file-upload/server/content/files/16079bb82a6be6---xuxelowosafuxivukisud.pdfIn PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8f6a2abc9---57715985572.pdfIn PDF document text
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/lv5n3p0iadvu1hn2d1g9iilmm3/xudafepunawifadujobiwige.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/8b6b6664bc3a3ed971f5ad3693347162/45336887638.pdfIn PDF document text
    • https://theshamrockpublecco.it/file/rotepemisovepanuf.pdfIn PDF document text
    • http://transfertrolley.cn/d/files/wuvewizupijoripuvejiz.pdfIn PDF document text
    • http://suarezbeltran.com/aym_images/files/75462683083.pdfIn PDF document text
    • http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/9chi6hcmfsh12c9pdoim0073lt/70569293121.pdfIn PDF document text
    • http://austintownfitch1980.com/clients/879833/File/pizetagunakalipalawudofo.pdfIn PDF document text
    • https://imagebuzz.net/ckfinder/userfiles/files/83167779375.pdfIn PDF document text
    • http://kcntanduc.vn/img_duhoc/files/19904047982.pdfIn PDF document text
    • http://www.caribbeandentist.com/wp-content/plugins/formcraft/file-upload/server/content/files/160de689aefbbd---48945391351.pdfIn PDF document text
    • 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_off0000e6bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6BD 11172 bytes
SHA-256: 2cd6618b33e6d5f5d4c92212aad826a6e972cdd2f617627ed8a9b34843a3b336
font_01_sfnt_off000100de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100DE 17480 bytes
SHA-256: a44f96ce645373c722f2089a420014e9761f2b4a05543900560fb6f17ad2f2a4
font_02_sfnt_off00012d90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D90 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1