Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8177615a65ae981…

MALICIOUS

PDF

87.8 KB Created: 2021-08-29 22:45:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: e2c02570c136a8b9ecc64a432db85712 SHA-1: 18fcf5466e814334b74104b50ad94ca640e45fa8 SHA-256: e8177615a65ae981019d2014b773c139861b896fd9e3b5cd4ad1ed0c2836fab2
156 Risk Score

Malware Insights

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

The PDF document contains a link farm pointing to numerous compromised WordPress upload directories and other disposable hosting sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The primary attack pattern involves luring users to click on these links, which are hosted on compromised infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://widepolymers.com/userfiles/file/51954406453.pdf In PDF document text
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e0794c012d2---90695881284.pdfIn PDF document text
    • http://centralwestwoodclassof1983.com/clients/c/cd/cd4b3c89dd1500142a52f05b9125c350/File/sujefaletadobidudozako.pdfIn PDF document text
    • http://michael-dhom.com/webseiten/file/50421302541.pdfIn PDF document text
    • https://www.albriug.com/static/editor/ckeditor/ckfinder/upfile/files/lozugek.pdfIn PDF document text
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/f874qr1mt3991n4ekrc1pqpl29/xanubuvuwem.pdfIn PDF document text
    • http://chrisdepanneservices.fr/Sites/cds/files/saboxenuleto.pdfIn PDF document text
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16091e56a23312---56351692126.pdfIn PDF document text
    • https://bouveau-consulting.com/userfiles/file/70530754197.pdfIn PDF document text
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/7b184c8243707f18fb834ca758c5ffc5/28386028450.pdfIn PDF document text
    • https://ngoctraithaibinhduong.com/uploads/news_file/lamexutuxadi.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/ap4t5aevhv1biv57i8rvcotb80/nuxokiridapomodezizu.pdfIn PDF document text
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160c379357ecac---93022558369.pdfIn PDF document text
    • https://educhina.mn/editor/files/forigutonisufanuxow.pdfIn PDF document text
    • http://mazraeir.com/images/upload/files/27543744129.pdfIn PDF document text
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d53a963621---vosawuloxijagog.pdfIn PDF document text
    • https://holocaustresearch.pl/nowy/photo/file/fonurodojifetasovigomokiw.pdfIn PDF document text
    • http://icloudcleaners.com/uploads/account/autoresponderfiles/56371309242.pdfIn PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4365188cb8---62977762728.pdfIn PDF document text
    • http://akademibt.com/resimler/files/rositata.pdfIn PDF document text
    • http://anhuizpyy.com/upload_fck/file/2021-4-28/20210428232236669753.pdfIn PDF document text
    • http://sunnyten.net/userData/board/file/dovaduvuzixikurokivirixiv.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=pes+2021+download+mobilePDF link annotation
    • 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_off0000f782.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF782 18320 bytes
SHA-256: 51e7e0aea1f674ab7f4437eaaf59219772e45719e4f610aadcbc94366ef3cfa6
font_01_sfnt_off0001271b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1271B 10732 bytes
SHA-256: 05ae0fd47228abf8db01c445939506631dab550f0411917394241a8d6bddfb06
font_02_sfnt_off00013fe3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13FE3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1