Malicious PDF — malware analysis report

Static analysis result for SHA-256 de21365577a3cfa8…

MALICIOUS

PDF

99.5 KB Created: 2021-09-14 11:27:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 487063a37f946698ee743589dee886fd SHA-1: 2c75bf3738db12a3c879a846e27b0f6453a4768a SHA-256: de21365577a3cfa85444b8b532820839ffd36796e34e69bf238466785fa5c144
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains a large number of external links, many hosted on disposable domains or compromised CMS uploads, suggesting a link farm designed to direct users to malicious content. No scripts were extracted, but the presence of numerous URLs indicates a phishing or SEO poisoning attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9784

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://garglob.ru/uplcv?utm_term=magyar+sz%C3%B6vegfelolvas%C3%B3+program+androidra PDF link annotation
    • http://kawana.tech/userfiles/file/lajijabopimusaladuw.pdfIn PDF document text
    • http://xn----8sbnbd9chja.xn--p1ai/userfiles/file/12511727453.pdfIn PDF document text
    • https://bauarch.bg/files/46318998238.pdfIn PDF document text
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134222c13b0e---xuwuladipupanaguxa.pdfIn PDF document text
    • http://sethhukumchandschool.com/userfiles/file/nosenusofet.pdfIn PDF document text
    • http://swapnakoodu.com/fck_uploads/file/34994563469.pdfIn PDF document text
    • http://cngwalk.com/fckeditor/userfiles/image/89971226673.pdfIn PDF document text
    • http://asdgolfclubtoscana.com/writable/public/userfiles/file/17518568740.pdfIn PDF document text
    • https://haps.company/wp-content/plugins/super-forms/uploads/php/files/fd0755a65a3ebb4d06bd6c363c6416ff/tipor.pdfIn PDF document text
    • https://laptopserwis.com/app/webroot/media/files/34200960525.pdfIn PDF document text
    • https://chuyennhakienvangvn.net/upload/files/gamikuvofimeragafikur.pdfIn PDF document text
    • http://serramentisiciliano.it/userfiles/files/lusijibiboloxadig.pdfIn PDF document text
    • http://camelliafb.com/uploads/files/202109091159292574.pdfIn PDF document text
    • http://asupuro.com/upload/save_image/files/70236121292.pdfIn PDF document text
    • http://almawred-sy.com/files/adminfiles/files/xakerumelave.pdfIn PDF document text
    • https://unifor975.ca/userfiles/file/55462094637.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/161403ba4aa601---lilumaloniguk.pdfIn PDF document text
    • http://dangkykinhdoanhkiengiang.com/upload/ck/files/57009393311.pdfIn PDF document text
    • https://lufty.cz/UserFiles/files/wovajubigaravo.pdfIn PDF document text
    • http://krakow4you.pl/krakow/files/gilexavagifesudizibexo.pdfIn PDF document text
    • https://cosonnguyenthanh.vn/webroot/userfiles/files/migisamemelelomifej.pdfIn PDF document text
    • http://hflbdq.com/uploads/file/100243451122.pdfIn PDF document text
    • http://studiovalentini.eu/userfiles/files/34144678927.pdfIn PDF document text
    • http://rjbmachinery.com/d/files/monezotepidepokeminimo.pdfIn PDF document text
    • http://lifebeachvilla.com/uploads/image/files/witimitorekuwanovipabido.pdfIn PDF document text
    • https://petribax.com/userfiles/file/wipopalimabodovepotoka.pdfIn PDF document text
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137028e3e52b---gawim.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_off00011fb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FB2 11328 bytes
SHA-256: f26dc7e43384f0dc0784d2eae934e4faa66bffe58d672137856d92a3a7eb92ac
font_01_sfnt_off0001397f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1397F 17832 bytes
SHA-256: fc2134bf3286822185397bf1b8c89e36d6f693682beb25dcc85c89bbb4eff7fb
font_02_sfnt_off000165ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x165EE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1