Malicious PDF — malware analysis report

Static analysis result for SHA-256 6e9402aa4b5ea3d1…

MALICIOUS

PDF

74.7 KB Created: 2021-08-20 14:28:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-27
MD5: 3c0f49a83344169de5cf1fc3b2fb8d26 SHA-1: f1f1311b16c21baee4b63fca6df0d48579aeb504 SHA-256: 6e9402aa4b5ea3d116e2aa793a44c1ecfe5558cb80555e6e07a870e74e8db09e
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple heuristic firings indicating it is a link farm pointing to potentially compromised CMS uploads and disposable hosting. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were extracted, the numerous embedded URLs are the primary indicators of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9129

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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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
  • 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://cardion.dk/gfx/fckimages/file/zobepukinefil.pdf In PDF document text
    • https://majorsagilekvaros.hu/uploads/file/mewubosefeturonopota.pdfIn PDF document text
    • https://cupanghitam.com/contents//files/gorizitofapujufitupilavi.pdfIn PDF document text
    • https://studio-september.com/wp-content/plugins/super-forms/uploads/php/files/ae440118c0b5ffcf0fa400954ff85cfd/ninusuwojumomujug.pdfIn PDF document text
    • http://amphorabeautyclub.com/campannas/file/xomemoxakakukoravewu.pdfIn PDF document text
    • https://vipbeachhouse.com/uploads/editor/file/vezemugobepuzi.pdfIn PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160854b8dd3318---53112619421.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/m3b5s7ncj77ld27m4vbcdefak7/38145792706.pdfIn PDF document text
    • http://insidethedigitaltrend.biz/userfiles/file/9371638104.pdfIn PDF document text
    • https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/98b34916eb6a0905193040dbdef2e42b/wefidobepi.pdfIn PDF document text
    • https://rosettes.it/userfiles/file/78259636705.pdfIn PDF document text
    • http://mrs724.ir/basefile/drtiketcom/files/donopawu.pdfIn PDF document text
    • https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/78cb31cf948bc4c6e85313ff4ab26dcc/pojivodifolifod.pdfIn PDF document text
    • https://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/9km9vt23g08jdha4h5ts9a4onl/perexed.pdfIn PDF document text
    • http://daglichtfilters.nl/ckfinder/userfiles/files/lozepe.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/8ad37896ae19f89deaf1ac1cc82be0c4/4643543464.pdfIn PDF document text
    • http://allaboutdowney.com/userimages/46086313542.pdfIn PDF document text
    • https://ipic.vn/userfiles/file/lejujisumuletide.pdfIn PDF document text
    • http://travelsi.ru/ckfinder/userfiles/files/83809431209.pdfIn PDF document text
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b23dd876c1---54618181361.pdfIn PDF document text
    • https://infoenergie-loire.org/userfiles/file/xazenidagiwizovibof.pdfIn PDF document text
    • https://www.servicioscalibrados.com/wp-content/plugins/super-forms/uploads/php/files/54842b801d609ef39cf7bb5947a9af55/xoweb.pdfIn PDF document text
    • https://smsenerji.com/resimler/files/88948807355.pdfIn PDF document text
    • http://www.mywil.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1606f60b358bda---gipapiruzepupetudiko.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=how+to+pair+skullcandy+wireless+earbuds+indyPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e5be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5BE 17500 bytes
SHA-256: 7e3c345ceea746edc0b0dff39fa1ecf488f8bc243326c8d805bd8859028ce059
font_01_sfnt_off0001138c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1138C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1