Malicious PDF — malware analysis report

Static analysis result for SHA-256 172c3ee808f906ac…

MALICIOUS

PDF

87.2 KB Created: 2021-10-14 17:26:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: ee16523946549b72f8493bb200b77749 SHA-1: 475e5637ef8a991c3db3e1af69c73c6866b0a67d SHA-256: 172c3ee808f906ac7793d7a59323a66f1a6cf119e10764d18626f15042399d21
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links, many pointing to compromised CMS uploads and disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The document body is heavily obfuscated and unreadable, providing no direct clues about its purpose beyond the heuristic findings.

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 http://studioingegneriavaragnolo.com/userfiles/files/bujipitaxarulutunoza.pdf In PDF document text
    • http://maudchristan.nl/ckfinder/userfiles/files/durukazipavaraxopezuwafov.pdfIn PDF document text
    • http://chanakyaaerospacedefence.com/userfiles/file/11550286305.pdfIn PDF document text
    • http://jysfh.com/upload_fck/file/2021-9-7/20210907100901211408.pdfIn PDF document text
    • https://coastalstudio.com/images/main/file/35597619576.pdfIn PDF document text
    • https://ww150001.linebot.net/upfile/files/20210921201024.pdfIn PDF document text
    • http://sdes.in/uploads/tonas.pdfIn PDF document text
    • http://yey.uw52.com/upload/files/nokulafobebepapimu.pdfIn PDF document text
    • https://www.harnoordesigns.com/wp-content/plugins/super-forms/uploads/php/files/871e407996a19cf969bf0a30ee586b32/zowukitagejolupe.pdfIn PDF document text
    • https://nieruchomosciprzetargi.pl/files/file/91444967571.pdfIn PDF document text
    • http://khocabien.com/uploads/files/91067676787.pdfIn PDF document text
    • http://thanhtindesign.vn/uploads/image/files/robevovomipujelenigaj.pdfIn PDF document text
    • https://underworldgear.com/admin/images/fckImg/file/todigoxake.pdfIn PDF document text
    • http://kdwatch.net/upload/files/2021092013210381.pdfIn PDF document text
    • http://zdrowejaja.com/Upload/file/95155395374.pdfIn PDF document text
    • https://opescom-store.com/uploads/FCK_files/file/gafugimowima.pdfIn PDF document text
    • https://mkycc4.com/kycc4.com/userfiles/files/sunoxixazivixik.pdfIn PDF document text
    • https://pmapmc.com/userfiles/image/files/13286261735.pdfIn PDF document text
    • https://camgloberealtor.com/userfiles/file/jamewolitubunurafititoji.pdfIn PDF document text
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/391fb899821cfa3506de011b6b27c7cc/gupikipa.pdfIn PDF document text
    • https://oasis-travel.ro/files/gosekuxale.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/b47ca434297e4ce28a8f2dafac4b9870/mifawakapawatetiwufarobuv.pdfIn PDF document text
    • http://nessie-vinylcare.com/file/11487809596.pdfIn PDF document text
    • http://fatamorgana.fr/uploads/assets/file/45259807312.pdfIn PDF document text
    • https://eletvital.hu/uploads/files/kewizirifoja.pdfIn PDF document text
    • http://feedproxy.google.com/~r/MbOu/~3/2I9n2o-U8HI/uplcv?utm_term=kinds+of+tour+guidePDF 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_off0000f1fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1FD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010a14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A14 10412 bytes
SHA-256: 40d5ef92d4474cd9e83c4bc3f4f646920e5787697365bf0a7e5e762ad9faf6ee
font_02_sfnt_off00012194.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12194 17472 bytes
SHA-256: 1994f9f766287cfc54b81cc2c3770bf64a40c7037fe32e0b3924c750f7e74f1d