Malicious PDF — malware analysis report

Static analysis result for SHA-256 b2ebaead8842a666…

MALICIOUS

PDF

74.3 KB Created: 2021-09-02 04:23:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 23d1548a030e55375d45fa3be6156a3c SHA-1: 68f048a6a0f193e35654ab51427b65932ff3fcdb SHA-256: b2ebaead8842a66620b3f8a170da7bfc0ee64ced46a5b97059bd43e8dda67d35
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous links pointing to compromised websites, including WordPress upload directories and disposable hosting, suggesting a phishing or malware distribution campaign. The file's structure and embedded links indicate it is designed to redirect users to malicious external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://queure.ru/uplcv?utm_term=jackson+county+school+district PDF link annotation
    • http://ekachaiguitarist.com/ckfinder/userfiles/files/29223792079.pdfIn PDF document text
    • https://xn--80aaaglcftt5alesfkk7f.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/32c75c49ecd51faeb4572d7b8d3c6ffe/69172956738.pdfIn PDF document text
    • http://scro.ru/pic/file/futadufole.pdfIn PDF document text
    • http://schs1968.com/clients/861610/File/90992541568.pdfIn PDF document text
    • http://tate79.com/clients/868750/File/93756494164.pdfIn PDF document text
    • https://kogan-photo.ru/wp-content/plugins/super-forms/uploads/php/files/53ebf0cfb2ca54313fc4c564b1aed23c/renilumabe.pdfIn PDF document text
    • http://expresskaliski.info/file/kiraragerafelusimanarelud.pdfIn PDF document text
    • https://asiaviews.org/wp-content/plugins/super-forms/uploads/php/files/0927694rcdsue2v9k0lckmnig1/39206163722.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/16124a03ddaaab---lisipubomumikuju.pdfIn PDF document text
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/vu8u124orbp546oqdmc5p4ucbr/94583732757.pdfIn PDF document text
    • http://rosabaum.de/web/editor/files/xenamutazi.pdfIn PDF document text
    • http://grgct.com/ckfinder/userfiles/files/turaruwolizira.pdfIn PDF document text
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/160ca09a829bef---mobuwo.pdfIn PDF document text
    • http://brenna-ski.pl/userfiles/file/bimoxegid.pdfIn PDF document text
    • https://tucsonhomewindowtint.com/wp-content/plugins/super-forms/uploads/php/files/e593ede8280856147ea38c5cdf1b54d5/23240202268.pdfIn PDF document text
    • http://petswithlove.com/cvsprojects/SSK/Source/2.0.0/images/files/41556494077.pdfIn PDF document text
    • http://krevue.cz/UserFiles/File/pepufafenukojo.pdfIn PDF document text
    • http://bananamusic.tw/uploads/files/202108210113476988.pdfIn PDF document text
    • https://laughteronlineuniversity.com/images/upload/files/zatilesatuki.pdfIn PDF document text
    • http://thuocamakong.net/userfiles/image/file/sifitikax.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c3d1bec983e---movojimaruvowavoxesitif.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_off0000c080.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC080 10632 bytes
SHA-256: ac2d2a75ba22e3df9b826f298de19db10f9795b956dedb49f5926b2d75f4c206
font_01_sfnt_off0000d8d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8D0 16412 bytes
SHA-256: b2832730aafe862006cd2c33103513c27bed17f76032bd3d6b0c4c763826f614
font_02_sfnt_off00010300.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10300 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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