Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae2b4290bd1db56a…

MALICIOUS

PDF

84.4 KB Created: 2021-09-17 04:51:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: ac448d738c22514bd548d03277cd2c31 SHA-1: 91941eedaa0e2f93724a2137aa95f17a92ca1ff7 SHA-256: ae2b4290bd1db56ab2d1569224892d29c04846c246a54e3404ee5c3c11c9ac03
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable hosting or compromised WordPress sites, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution through these links. No scripts were extracted, and the document body was unreadable.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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 http://symbioticlifetech.org/attfile/fckimg/file///2021090531729_494409827.pdf In PDF document text
    • http://pol2-simf.ru/userfiles/file/65515049966.pdfIn PDF document text
    • http://pathtojanna.com/userfiles/files/vezalitejoruni.pdfIn PDF document text
    • http://bjxbw.cn/userfiles/file/62421036178.pdfIn PDF document text
    • http://truhlarstvi-strakonice.cz/files/file/natoriborimoxalabamib.pdfIn PDF document text
    • http://bluecars.pl/userfiles/file/71961256088.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/161354c3e5ad83---82050872426.pdfIn PDF document text
    • http://xn--365-pn7mwb654m2qn.com/ckupload/files/5061293700.pdfIn PDF document text
    • http://fapannimario.it/userfiles/files/95388500444.pdfIn PDF document text
    • http://tourhong.com/FileData/ckfinder/files/20210904_14B1930F766F8A3C.pdfIn PDF document text
    • http://bulk-supplies.com/userfiles/file/sikavibalabexedapazar.pdfIn PDF document text
    • http://take114.kr/FileData/ckfinder/files/20210907_611478ACF0CE27E8.pdfIn PDF document text
    • https://kapokcmassage.com/uploads/files/202109020720301429.pdfIn PDF document text
    • https://endobible.com/userfiles/file/55679878542.pdfIn PDF document text
    • http://jrmhandling.nl/upload/file/kijupasikozowap.pdfIn PDF document text
    • https://elmawadah.com/userfiles/file/sudeganodod.pdfIn PDF document text
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/1613a3e3f64748---ferato.pdfIn PDF document text
    • http://asqcert.net/files/files/gebigogav.pdfIn PDF document text
    • http://konferencii.org/web/uploads/assets/file/73297624030.pdfIn PDF document text
    • https://efsanepin.com/calisma2/files/uploads/59630543527.pdfIn PDF document text
    • https://sailstudy.in/ckfinder/userfiles/files/wotelisabinemifezodup.pdfIn PDF document text
    • http://aligokdemir.com/resimler/files/luxefegibejogironotubi.pdfIn PDF document text
    • https://www.lavishlook.se/wp-content/plugins/super-forms/uploads/php/files/bd8211495c931daf3eaac0c1f72acfa3/nodezaki.pdfIn PDF document text
    • http://biolabsrl.org/userfiles/files/mewodo.pdfIn PDF document text
    • http://st-ark.it/userfiles/files/nuverokarobivux.pdfIn PDF document text
    • http://ugrctrani.it/userfiles/files/14952538205.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=android+auto+update+appsPDF 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_off0000e57c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE57C 17932 bytes
SHA-256: 9a1caa1ba8d78f952b2b909c179221af4703896e5f2d44263edadf05c14faed3
font_01_sfnt_off000113cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113CD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012be4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BE4 10420 bytes
SHA-256: bd0861d7b5a5e37bbbc58927d8e68b278c6425d2bfdece5b4d08d40b9fe32762