Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd31baba65fab268…

MALICIOUS

PDF

82.9 KB Created: 2021-09-01 06:28:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 63401b8437f2fbf070152a84de1a5d52 SHA-1: a68ef3eeb57d99ad3cdaf9bc980532766f7a761f SHA-256: bd31baba65fab2684d43c51cdfee3f901730a3d5a38535d0fd7b07fa13fbdc2d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to various domains, some of which are associated with compromised CMS uploads. The primary purpose appears to be directing users to external resources, likely for phishing or further malware delivery, aligning with spearphishing attachment tactics. No scripts were extracted, but the structure suggests a malicious document designed to leverage external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://www.sosonomo.com/ckfinder/userfiles/files/14665588375.pdf In PDF document text
    • http://zeguvietnam.com/uploads/ckfinder/files/defujoxitazewuvazajawak.pdfIn PDF document text
    • https://inverpalmas.site/aym_image/files/291901066.pdfIn PDF document text
    • http://reicar.dk/userfiles/file/mesawigopujavebokazumoto.pdfIn PDF document text
    • http://standartbio.com/fckfiles/file/75765775690.pdfIn PDF document text
    • http://szkolaprzybranowo.pl/ckfinder/userfiles/files/27751175614.pdfIn PDF document text
    • http://1960vonsteuben.com/clients/d/df/dfb5e1b83ea85bfdc5ef1da934264264/File/pametixoxoxetafumanad.pdfIn PDF document text
    • https://www.clubmanizales.com.co/wp-content/plugins/formcraft/file-upload/server/content/files/16126684bc2638---89012088766.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160872dfa85bf2---jakesewugodapova.pdfIn PDF document text
    • https://conexus-study-abroad-travel.com/ckfinder/userfiles/file/guvadeve.pdfIn PDF document text
    • http://royalgoodviewresort.com/Uploads/file/13066170392.pdfIn PDF document text
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/cd382263ae091da29411b34cb18b4319/85769332170.pdfIn PDF document text
    • https://sckprime.com/wp-content/plugins/super-forms/uploads/php/files/5574995465f6bef49cf6a39f9dcc0bf1/4463506040.pdfIn PDF document text
    • http://www.molinoag.com/wp-content/plugins/formcraft/file-upload/server/content/files/160783bfddbc3e---modenademuzovimusesop.pdfIn PDF document text
    • https://nitdgp.ac.in/uploads/userfiles/files/bulavugasekive.pdfIn PDF document text
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607770f5d9104---safutalatag.pdfIn PDF document text
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/160d560d160c85---9020092810.pdfIn PDF document text
    • https://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/2857059e437c21a2a33aa76624eabcb7/bufagikugadefa.pdfIn PDF document text
    • https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/dd30616f45f248b5f84d7ddb3c92d562/dibomewosonogugu.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/74huk42n1jgkhpv4vsb66fq365/35981086076.pdfIn PDF document text
    • http://loveperfectionschool.com/upload/file/78438317188.pdfIn PDF document text
    • http://aardbeienfeesten.nl/uploadimages/files/44276052275.pdfIn PDF document text
    • http://www.hydro-tg.pro/upload/file/bebozu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=export+a+few+pages+from+pdfPDF 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_off0000dcf6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCF6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f508.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF508 18768 bytes
SHA-256: a05bd85d30660a67d044cf5d6cbd5dfee01ba907c3a3cc29f95cb3c433e82826
font_02_sfnt_off000125e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125E7 10772 bytes
SHA-256: efbabd480621a7c451577aadd6b0204935fb46e416e89759fb11177db5d27b2e

Open this report in the interactive analyzer, or submit your own file for analysis.