Malicious PDF — malware analysis report

Static analysis result for SHA-256 01c1894f25c86e00…

MALICIOUS

PDF

84.3 KB Created: 2021-08-18 20:36:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 75d10b1e949473a7eb52d749363e6ba1 SHA-1: a390f1f4b6f75c05fdc250c781f014f57a605d17 SHA-256: 01c1894f25c86e00d8c89bbef83b2d76aae944a60a9e8b19d766a63b51f66e9d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection for Pdf.Phishing.Trojan. The presence of numerous external URIs, many pointing to compromised CMS uploads, indicates a link farm designed to redirect users to malicious content. The ML classifier also strongly indicated maliciousness. No scripts were extracted, but the overall structure suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

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://crewmak.ru/uplcv?utm_term=bow+and+arrow+game+free+download+for+windows+10+64+bit PDF link annotation
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091c464d4c22---xofezebexizelesele.pdfIn PDF document text
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/160b6b8d519b5a---gukuwaxuxemotutaga.pdfIn PDF document text
    • https://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160a4537a5b272---46532532685.pdfIn PDF document text
    • https://biocoils.com/img/file/sasovumokebojemad.pdfIn PDF document text
    • http://bochosushi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080162f51339---wofukepukanojanad.pdfIn PDF document text
    • https://law.com.sg/wp-content/plugins/super-forms/uploads/php/files/3d0dbcdec6f29d846ba306a2612d76c6/pamejodejaretoxegosadiw.pdfIn PDF document text
    • http://suchanekstomatolog.pl/files/file/75281662003.pdfIn PDF document text
    • http://htygroup.com/upload/files/periz.pdfIn PDF document text
    • https://espaciocultivarte.com/ckfinder/userfiles/files/wosiza.pdfIn PDF document text
    • https://delaneyllc.com/ckfinder/userfiles/files/wusonezolatolufizusofate.pdfIn PDF document text
    • http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/10295980af71b3e7ddf4b4d1096288b2/sowixaxenegaziz.pdfIn PDF document text
    • http://sistersaviopublicschool.com/userfiles/file/16507997583.pdfIn PDF document text
    • http://blpest.com/UserFiles/file/89521395617.pdfIn PDF document text
    • http://alpinedelhi.com/userfiles/files/xitegadif.pdfIn PDF document text
    • https://megatekspb.ru/sites/default/files/uploads/pujewikinusul.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/1635b0fbea22551dba3436ef3f81e2be/venarojusenerasobedufivi.pdfIn PDF document text
    • http://swaminarayangm.org/userfiles/file/3723666001.pdfIn PDF document text
    • http://thoitrangvabaoho.com/Images_upload/files/14608534186.pdfIn PDF document text
    • http://naasschoolofmotoring.com/fckeditor/userfiles/file/35484129831.pdfIn PDF document text
    • http://domplus.su/userfiles/files/tusabagubewatobigowowo.pdfIn PDF document text
    • https://bluebeakbranding.com/wp-content/plugins/super-forms/uploads/php/files/6319e061fd23dcb10d8f2d8ad3f7f730/wubowudugasogo.pdfIn PDF document text
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/c83fb9a4c6e70bff51d2daaefe83ec94/38772662702.pdfIn PDF document text
    • http://hanlacsclub.com/ckupload/files/daliluwoj.pdfIn PDF document text
    • https://kudamatsu.org/userfiles/file/30732485534.pdfIn PDF document text
    • https://indacphuc.com/wp-content/plugins/super-forms/uploads/php/files/u65qc3faso2h3hknfbr6rtoueu/fapugisutuxawesikatofexud.pdfIn PDF document text
    • http://rund.cz/UserFiles/File/lakuravesurisexibij.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_off0000e27d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE27D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fa8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA8F 16608 bytes
SHA-256: 880c852266f759ccbbf73a388d360000506bc2fda2ee1474524fd1808443ef9f
font_02_sfnt_off00012589.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12589 11396 bytes
SHA-256: a2985f4d6b6a56c4725e29831736e7e87303761ff118c39bcb1bad158e8026d8

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