Malicious PDF — malware analysis report

Static analysis result for SHA-256 d90273b3044e8cff…

MALICIOUS

PDF

84.5 KB Created: 2021-09-19 01:26:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 6c59869d7c1fc1633ec2cbcbbc1dcf13 SHA-1: c9fc37e1d99d500c356428a74b9aa25a5c6a28a6 SHA-256: d90273b3044e8cff39ee03f7becdc1287a5f71f2838babef2e32516b9805df39
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by ClamAV as Pdf.Phishing.Trojan and ML classifiers indicated a high probability of maliciousness. It contains numerous embedded URLs that form a link farm, pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to distribute phishing content or malware. No scripts were extracted, but the structure and embedded URLs strongly indicate a phishing or malware delivery attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://smidgel.ru/uplcv?utm_term=iphone+emojis+for+android+instagram PDF link annotation
    • https://radekslodkiewicz.pl/files/file/26917845185.pdfIn PDF document text
    • https://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/3fcff14378a68f9bf4316ffe67084fb2/39141501560.pdfIn PDF document text
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131ddb857351---77102116630.pdfIn PDF document text
    • http://realtor-madrid.com/uploades/fckeditorfile/dadogizivupibijukaxe.pdfIn PDF document text
    • https://matras-matrasych96.ru/admin/ckfinder/userfiles/files/lasisazuma.pdfIn PDF document text
    • http://5lovestartw.com/CKEdit/upload/files/rijekiderixosogo.pdfIn PDF document text
    • http://heninrealty.com/userfiles/files/88017382816.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/64sprde35r8vvnvtm1eodii451/ravasetulizaxifefiwona.pdfIn PDF document text
    • https://aathichudi.org/userfiles/file/89149699697.pdfIn PDF document text
    • https://trieurodata.ro/images/file/89406516393.pdfIn PDF document text
    • http://karimeh.com/public/userfiles/file/xilasadegofafovoradotob.pdfIn PDF document text
    • http://eqletstalk.com/uploads/files/202109121033169172.pdfIn PDF document text
    • https://laatjehuisweerstralen.nl/upload/file/84059222523.pdfIn PDF document text
    • http://baoveantam.org/upload/files/wudevapawezovenanovo.pdfIn PDF document text
    • https://padservhosting.com/userfiles/file/62447860418.pdfIn PDF document text
    • http://meditopthailand.com/file/newoviropawog.pdfIn PDF document text
    • https://carcable-bg.com/uploads/pictures/files/vifolibivoma.pdfIn PDF document text
    • http://ottuk-e.org/userData/board/file/welajunikemijuzikaxalazes.pdfIn PDF document text
    • https://cebrigantina.com/025-CEB/images-editor/file/varerevofomovosukir.pdfIn PDF document text
    • http://grubstreet.ca/ckfinder/userfiles/files/widixewuxanuzonogusejomu.pdfIn PDF document text
    • http://obraz-tlt.ru/userfiles/file/zosijegulewa.pdfIn PDF document text
    • http://zhihepvb.com/upload/ckimg/files/202109090455126883.pdfIn PDF document text
    • http://pegasomeeting.medcoast.net/ckfinder/userfiles/files/pisamewun.pdfIn PDF document text
    • http://weiken-rc.com/upload/files/90895674848.pdfIn PDF document text
    • http://dachastyle.com/userfiles/file/piwojitudevefurevod.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_off0000dcf8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCF8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f50a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF50A 20800 bytes
SHA-256: fb9b1fe1e35e9cfcc3f4d9a75dbd8681ebbe1b683c3662992a45684e8732bc2b
font_02_sfnt_off00012ad9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AD9 10980 bytes
SHA-256: fe6bf2f0138f8b50ce884028bee04478e721909b685c39db84b4cde2509a3435