Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b9407640601e1b3…

MALICIOUS

PDF

77.0 KB Created: 2021-09-12 13:28:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: ef510b175152e9178dc235fa51824bd1 SHA-1: 35641c123e7553850315831e2263f7d1c39a1a50 SHA-256: 9b9407640601e1b3d7d532e66e09eab625286066069736d6444139103ca15167
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to compromised websites, a common tactic for phishing or malware distribution. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' indicates the document likely instructs the user to open a password-protected archive, a method to bypass gateway scanning. While no scripts were directly extracted, the presence of PDF link farms and the ML classifier's high confidence suggest malicious intent, likely to deliver a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://puginternational.com/ckfinder/userfiles/files/palatebuwe.pdf In PDF document text
    • https://pasarant0g3l-turbo-h1t.com/contents/files/47716991563.pdfIn PDF document text
    • http://fabrykakonwersji.pl/wp-content/plugins/super-forms/uploads/php/files/52d65d089cf436744f3b2c6cc538a9e7/35421352374.pdfIn PDF document text
    • https://www.tratedu.net/ssss2018/assets/143ad273/ckfinder/core/connector/php/upload/userfiles/files/2eda1c4d6364a3b8579bb77aeb1dcbde.pdfIn PDF document text
    • http://tourister.kr/userfiles/file/sulazipoge.pdfIn PDF document text
    • http://www.lnk-creation.fr/upload/file/tonizebudoxojivabaduvajiw.pdfIn PDF document text
    • http://fence-alarm.com/userfiles/files/54692511560.pdfIn PDF document text
    • http://motocams.cz/ckfinder/userfiles/files/89754016418.pdfIn PDF document text
    • http://meuble-tunisie.com/userfiles/file/72279076648.pdfIn PDF document text
    • https://bselink.com/userfiles/file/javikimuk.pdfIn PDF document text
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613c47ba8e3e5---80376119979.pdfIn PDF document text
    • http://s2group.pl/userfiles/file/merigiwokewa.pdfIn PDF document text
    • http://captainkillmite.com/uploads/files/202109120206376399.pdfIn PDF document text
    • http://technimexvn.com/images/ckeditor/files/39604023778.pdfIn PDF document text
    • https://china-glass-mosaic.com/userfiles/files/20210909_223627.pdfIn PDF document text
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fb0905a419---zodojuve.pdfIn PDF document text
    • https://fultoys.com/userfiles/82004448268.pdfIn PDF document text
    • http://medica-eg.com/userfiles/file/84494677689.pdfIn PDF document text
    • http://bulgankhangai.mn/userfiles/files/ludutozewebomanufa.pdfIn PDF document text
    • http://nyitotthaz.hu/userfiles/files/96473305230.pdfIn PDF document text
    • https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/ef0d5e1d7c9b0214e7b971323159fc7e/77581456458.pdfIn PDF document text
    • http://bjxbw.cn/userfiles/file/zaxutemipa.pdfIn PDF document text
    • https://fundacjaartfreeart.pl/userfiles/file/14040959061.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=hios+launcher+proPDF link annotation
    • https://www.posluh.hr/ckfinder/userfiles/files/46477951285.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_off0000ca9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA9C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e2ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2AE 16920 bytes
SHA-256: 6dd03ff09d04fe5d0f86df07d2c34a1dde68458ee83295e48fefaad693ca5272
font_02_sfnt_off00010eaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EAA 10464 bytes
SHA-256: 725179591158aee193776f312bed6aed777860d5dd82247d6757eccdf09fa154

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