Malicious PDF — malware analysis report

Static analysis result for SHA-256 18dd877e96ec01a2…

MALICIOUS

PDF

94.8 KB Created: 2021-07-14 05:14:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: a1fdf530effd61589eec0c7d109d576c SHA-1: b8a7a192f61d90799717b8f5610cc97bd3df6a48 SHA-256: 18dd877e96ec01a283038b5bedecf6929ee7347750ad6ff98dcec758c8f76281
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. The heuristics indicate the PDF contains a link farm pointing to compromised CMS upload storage, likely intended to host malicious files. The embedded URLs, such as those found on compromised WordPress sites, suggest a phishing or malware distribution attempt, potentially disguised as a download link for popular software.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9929

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://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b743806e0c4---68295532662.pdf In PDF document text
    • http://iphysiology.ru/upload/sorurozib.pdfIn PDF document text
    • http://yasairamenbar.com/uploads/files/pixurotexawusani.pdfIn PDF document text
    • http://staging.impactredevelopment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d0b234e11e---91902094106.pdfIn PDF document text
    • http://studiopol.com/userfiles/files/lururanuraxuzuj.pdfIn PDF document text
    • http://51-lq.com/userfiles/file///57413714277.pdfIn PDF document text
    • http://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/160893fbc94f07---lonuxekakepuxuni.pdfIn PDF document text
    • https://almudenafernandez.co/ckfinder/userfiles/Files/buxowulazanaluj.pdfIn PDF document text
    • http://sazjah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4358c001f1---zavunimixuvilazoda.pdfIn PDF document text
    • http://deborahkay.com/ckfinder/userfiles/files/bozaleg.pdfIn PDF document text
    • http://sochi-polyana.com/ckfinder/userfiles/files/50219379658.pdfIn PDF document text
    • http://hoaisonland.vn/upload/files/nazux.pdfIn PDF document text
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/9rraerg8eu7738vj0vd2gbm8l1/gudotonuna.pdfIn PDF document text
    • https://dalilak1.com/userfiles/file/gopek.pdfIn PDF document text
    • https://digireg.si/upload/sidumuworamufezasikabu.pdfIn PDF document text
    • http://unityproductions.com/upload/files/nodizozopujipomilumagu.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8d1f0e36ee---46429010981.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad51d39172b---82963253277.pdfIn PDF document text
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608593b8892fe---22773311470.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a7d9c373d16---miwofuf.pdfIn PDF document text
    • https://urbanplace.me/wp-content/plugins/super-forms/uploads/php/files/7a0d986ea7003853055345583648354d/todapewazitaxos.pdfIn PDF document text
    • http://seoulsquare.com/userfiles/file/78476066292.pdfIn PDF document text
    • http://ypcalumni.com/clients/2/24/24042806289e0d450134266962f0a0d8/File/fisonetimanu.pdfIn PDF document text
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/f6f1409d2653278bc61eb0659a916a08/70174228570.pdfIn PDF document text
    • http://boathousebrokerage.com/userfiles/file/lonewisubekarifumisagezuj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=download+call+of+duty+mobile+obb+filePDF 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_off00010c39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C39 18616 bytes
SHA-256: e1db1ff0f9bb15fded55407407c712c30f3ea957a9f8c54bf65dc8f4fe054153
font_01_sfnt_off00013c81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C81 10812 bytes
SHA-256: 83236eadd974b0fe69e588956e69f99d3a7784e1e9cafee16cd96bdeff5bc5f4
font_02_sfnt_off00015582.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15582 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1