Malicious PDF — malware analysis report

Static analysis result for SHA-256 f175ba429f137be9…

MALICIOUS

PDF

81.9 KB Created: 2021-09-02 05:53:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 339c337cc3a6f6d1b2ff10b6c66e38e8 SHA-1: b1758afc4f32b0962290cb936deacfbaca8f98da SHA-256: f175ba429f137be9b353b1072e1e16b5c7c5fa744e052d3e13860390271f7780
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains a link farm pointing to numerous domains, many of which are hosted on compromised CMS upload storage or disposable hosting, suggesting an attempt to redirect users to malicious content. No scripts were extracted, but the presence of numerous external links indicates a likely phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://gea99.com/ckfinder/userfiles/files/7664723241.pdf In PDF document text
    • http://55pluscommunityspecialist.com/userfiles/files/15693468467.pdfIn PDF document text
    • https://www.intermediastudios.com.mx/wp-content/plugins/super-forms/uploads/php/files/3ce858a88f845fa48190c0e6da4bd9ec/gerut.pdfIn PDF document text
    • https://acp-luxusingatlanok.hu/ckfinder/userfiles/files/xugawopijekerunu.pdfIn PDF document text
    • https://bykevin.com/wp-content/plugins/super-forms/uploads/php/files/af990f5d2f2babefd86be4e054e51cba/wolim.pdfIn PDF document text
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/d9133db6a1331cb179cf02052151b0d7/vabitosixekobob.pdfIn PDF document text
    • http://artetendasud.it/userfiles/files/fawus.pdfIn PDF document text
    • http://ypdtools.com/ckfinder/images_store/files/kowopivazezizab.pdfIn PDF document text
    • http://kunbot.com/upload/files/jezulojirixe.pdfIn PDF document text
    • https://nisahanpin.com/calisma2/files/uploads/nofomesadem.pdfIn PDF document text
    • http://dgone.kr/userfiles/file/20210812091248.pdfIn PDF document text
    • http://wo-kop.pl/userfiles/file/89782495565.pdfIn PDF document text
    • http://varanini.pl/userfiles/file/xutewalilubivudid.pdfIn PDF document text
    • https://grupahatak.pl/admin/_fck_files/file/legor.pdfIn PDF document text
    • http://telekommarketing.com/firme_data/files/zorilagovuneso.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/pepomemujinakiboxubu.pdfIn PDF document text
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae002f1a009---dopesir.pdfIn PDF document text
    • http://thermogroup.ru/uploads/files/varunokegemamibimat.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160edfeec4a96a---66590067168.pdfIn PDF document text
    • https://c4ir.ae/wp-content/plugins/super-forms/uploads/php/files/0k419uc64onlpk7u8636um5l81/wezuwixujakefebexege.pdfIn PDF document text
    • https://www.bocamvigliesrooms.com/wp-content/plugins/super-forms/uploads/php/files/dcf67874d905f69d718225e1fe214505/gowebemetefemefadug.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/f44756cee69bcb27110ce8820b64678b/37283522933.pdfIn PDF document text
    • https://t2sc.me/userfiles/1389614134.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=liable+meaning+in+englishPDF 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_off0000d822.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD822 19424 bytes
SHA-256: 157cd9e86f1c7deae8117cfa2e4e5592da41acefb86d0d4e01c7c975ce1db3fb
font_01_sfnt_off00010a76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A76 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001228d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1228D 10332 bytes
SHA-256: 7195fd162e8c46e9c832af25f2960cddc47dfb3a16bcb8ab0e06669e9ff6cafe

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