Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd86b2de1e775639…

MALICIOUS

PDF

90.1 KB Created: 2021-08-06 23:14:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 8666a060d8d22c698c46df47728318f4 SHA-1: c7a0ce76198de5b41ac5f9921fb63211e9184a69 SHA-256: dd86b2de1e77563976987ac0ccecef75570cfa947348977899435ef65238b930
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with numerous URLs pointing to compromised CMS uploads and disposable hosting. These links are likely used to redirect users to phishing sites or download further malware, aligning with a spearphishing attachment attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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 http://xtra360.net/campannas/file/11739472396.pdf In PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/16097297f4b093---sajajobepelelanarig.pdfIn PDF document text
    • https://oddluzanie.net/userfiles/file/bodofowetalimutar.pdfIn PDF document text
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/tet89dvi23l2njf1suhfbaf8b4/nepodizilufixupotinazerep.pdfIn PDF document text
    • http://akkoryazilim.com/userfiles/file/wakotepelerorutojim.pdfIn PDF document text
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/1607501f5dd708---35537888098.pdfIn PDF document text
    • http://orgue-chantepie.info/FCKeditor/upload/file/tufata.pdfIn PDF document text
    • http://constantcontinuity.com/membership/data//files/bojidik.pdfIn PDF document text
    • https://presentkompaniet.com/img/content/file/90920383587.pdfIn PDF document text
    • https://cerquilho.sp.gov.br/public/admin/globalarq/uploads/files/11688641646.pdfIn PDF document text
    • http://floridadressyourhome.com/uploaded_files/userfiles/files/sisodapuxiwalabepaw.pdfIn PDF document text
    • https://hcs1000.org/wp-content/plugins/super-forms/uploads/php/files/3f273fb5e2b94bcf3d3a81a924cd376c/58780998347.pdfIn PDF document text
    • http://cheumst.com/upload/fckeditor/file/lalukizuvefe.pdfIn PDF document text
    • https://www.jscorporation.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/16093fb51279c3---nevapiwalawufisabes.pdfIn PDF document text
    • http://www.mezmat.ru/ckfinder/userfiles/files/67719564274.pdfIn PDF document text
    • http://movietek.vn/hinh-anh/files/36747299199.pdfIn PDF document text
    • http://lor-rostov.su/userfiles/files/tagigumabaked.pdfIn PDF document text
    • http://libertyquad72.fr/userfiles/file/45765451238.pdfIn PDF document text
    • http://wwpokebar.com/uploads/files/sewevelelapuwopagugigin.pdfIn PDF document text
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/940054127fbde8124ef2e00c4890fee2/gafeg.pdfIn PDF document text
    • http://xdata.pl/app/webroot/img/ckf/files/gixotodazinakuvadu.pdfIn PDF document text
    • https://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/2b922b12cd1b071e5073b5f09027e3c1/wigevifuvusiwurugi.pdfIn PDF document text
    • http://sakaryakasaplarodasi.org/userfiles/file/zapuvifimutu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=aliexpress+cuenta+anormalPDF 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_off0000f908.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF908 10716 bytes
SHA-256: 6df231ea26770391e0dc1393b83cf2b1174aae86d091311ba979dda3db65f3e6
font_01_sfnt_off000111af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111AF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000129c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129C1 18228 bytes
SHA-256: 2cde4b20abacbd906635ff775d2fed6b66e4e1e09ebe761e7a7e751ab5a74a7c

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