Malicious PDF — malware analysis report

Static analysis result for SHA-256 3340c78839b3d6fc…

MALICIOUS

PDF

68.7 KB Created: 2021-09-25 14:03:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: a690aeb7a552473b91c1a7d31a0fbda6 SHA-1: eb5ef42439df61f89c7a8e828c547f754e58869b SHA-256: 3340c78839b3d6fc9f7652e5ffcfb33503cec5f44445a26d2f2c9d0a156b5b4b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics indicate the document functions as a link farm, directing users to various potentially compromised or disposable hosting sites. While no scripts were explicitly extracted, the presence of PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics suggests the document's primary purpose is to redirect users to external, untrusted URLs, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://szyqjsj.com/UploadFile/file/20210925134343974.pdf In PDF document text
    • https://ozmutludokum.com/userfiles/file/dovax.pdfIn PDF document text
    • https://cihangirhotel.com/upload/ckfinder/files/45992259115.pdfIn PDF document text
    • https://www.domaine-boussard-chablis.fr/ckfinder/userfiles/files/bamug.pdfIn PDF document text
    • http://kasaitogo.com/uploads/files/mutojikumusininekana.pdfIn PDF document text
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/toikq66mm1uid2thijv0ta2ate/suwinibavizumarirekemuk.pdfIn PDF document text
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614e5cba3e500---66385286130.pdfIn PDF document text
    • http://tourgrodno.by/images/content/file/82672699435.pdfIn PDF document text
    • https://kompaspt2.com/contents/files/xotix.pdfIn PDF document text
    • http://telegid.tv/userfiles/file/raratobi.pdfIn PDF document text
    • http://kantoromega.pl/userfiles/file/vepagapabapugegapa.pdfIn PDF document text
    • http://dakmet.pl/upload/tafofabe.pdfIn PDF document text
    • http://trevelsi.ru/ckfinder/userfiles/files/wifafosawedamubipi.pdfIn PDF document text
    • http://snnet.kr/board_pds/fckeditor/2021/09/file/87758031779.pdfIn PDF document text
    • https://totalsewa.com/userfiles/file/bulopasokatevejuxav.pdfIn PDF document text
    • https://www.whoamiandwhyamihere.com/ckfinder/userfiles/files/87192327448.pdfIn PDF document text
    • http://beijingxinzhi.com/userfiles/file/20210922193233_1818786453.pdfIn PDF document text
    • https://jewfri.kr/files/image/files/73518787835.pdfIn PDF document text
    • https://tonthephunglan.vn/upload/files/62181214314.pdfIn PDF document text
    • http://reelproductionshd.com/userfiles/file/37481897517.pdfIn PDF document text
    • https://ecef-groupe.com/wp-content/plugins/super-forms/uploads/php/files/aam9ehss5tcjjf05ncnlur2k82/kezuramuzovikisitina.pdfIn PDF document text
    • http://szm.hu/userfiles/file/56435490871.pdfIn PDF document text
    • https://growyourmoney.in/userfiles/files/31027746628.pdfIn PDF document text
    • http://zhengfutz.com/v15/Upload/file/20219122148489145.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=why+my+play+store+cannot+downloadPDF 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_off0000aebc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAEBC 10880 bytes
SHA-256: a565537b38542fea1949b08236f13e81c73b6b8c90fc74a70b0106be7aba2fae
font_01_sfnt_off0000c7d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7D1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000dfe3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFE3 15192 bytes
SHA-256: f2a68f2686b56b23f49f50a1eca6b67afc829fce43f1d70735865b25e6c117d8

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