Malicious PDF — malware analysis report

Static analysis result for SHA-256 b44afe528e8e40f5…

MALICIOUS

PDF

102.9 KB Created: 2021-06-30 16:19:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a673a28c8be9c1d82df0f24e898fe64a SHA-1: 0371c16e31f3913170cd53c5b26df53f0fd66aa0 SHA-256: b44afe528e8e40f5dbe8edd211613869db42f24ae8d39c4b21f627278fe3c88f
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites and other disposable hosting. These links likely lead to phishing pages or further malware downloads, indicating a malicious intent to redirect users to unsafe content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9737

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://drafthe.ru/uplcv?utm_term=meaning+of+beer+lahai+roi
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/d76545534c24d0b2e46e858765d7de30/sesugosewexemik.pdf
    • http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/f2c4be65d9e1948aba18c8ba8173342c/fedadovisisijekivigiguzef.pdf
    • http://gorisum.net/fckeditor/upload_file/file/depinimawidu.pdf
    • http://www.predoisiasociatii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160be17050450e---degavobepelirobaji.pdf
    • http://cesishotel.com/res/wysiwyg/file/29170687527.pdf
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fc09e0b3e3---41382252052.pdf
    • https://centar-znr-zop.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16081cebd0d799---4534826256.pdf
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d1ec60bbb4---zikelevuvevusow.pdf
    • http://reelproductionshd.com/userfiles/file/63580492767.pdf
    • https://soechi.com/userfiles/file/wuwinonelolilutesusi.pdf
    • https://maugli24.ru/wp-content/plugins/super-forms/uploads/php/files/b1bd51a3d0126feeed546c53c829b0bf/zinimi.pdf
    • http://goref.ru/files/file/23765989460.pdf
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/7b34b9f9274165d9c5d70fe1c9b1590f/93712060503.pdf
    • http://gourmethousemacau.com/UploadFilesfile///kutovebip.pdf
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16073e84a750a8---43616319859.pdf
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/160c986a6e2a87---bunap.pdf
    • http://hud101.vn/webroot/img/posts/files/68082972692.pdf
    • http://sentezetutmerkezi.com/upload/ckfinder/files/supepaboditexefexuv.pdf
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607aeafe6334e---xujefebidoxojaduxutep.pdf
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/296qf1ab0ab28rud5cf75j75sd/38517246685.pdf
    • https://www.bakirkoytemsilcisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e0f6b0a535---29584701355.pdf
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb55f7b36a---terazirusotudavipeturuga.pdf
    • https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/1bffb73490db8163cdde731c521d7889/79663647902.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ff6f.bin
29477c596975e0ef153d127973d73046889bb903b2d2c1a830495ae009744e9d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFF6F 10360 bytes
font_01_sfnt_off000116ab.bin
fe109c0e1170242f197a5dae65d62fba33ad350d46fce99e86b5813c6fd4ef20		 pdf-font-stream PDF embedded font (sfnt) at offset 0x116AB 21056 bytes
font_02_sfnt_off00014d87.bin
4e726621618450a1a8e6e95146ab7445e71366e16ea1aaf62970fdc8c5189e04		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14D87 2092 bytes
font_03_sfnt_off0001570c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1570C 16792 bytes
font_04_sfnt_off00016f1d.bin
aba90fe58e2a1fe181e4950b971c3d7128987c3fda980133ac98fb023e23559c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x16F1D 18384 bytes

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