Malicious PDF — malware analysis report

Static analysis result for SHA-256 816d72207d22a337…

MALICIOUS

PDF

86.7 KB Created: 2021-09-21 00:01:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 9c7da903bf2234593ff6415291ec8af3 SHA-1: 8d690a28aa5fed6daf94d8e6192bb99d9291a635 SHA-256: 816d72207d22a337eed3fa0083fca740f011114a7ee8614950d0d37d54bcb3e9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised or disposable domains, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, with the PDF being identified as a phishing trojan. While no scripts were explicitly extracted, the nature of the links and the heuristic firings point towards a malicious document, likely delivered via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://www.likoda.com.tw/upload/ckimg/files/gepowanepokanufetiv.pdf In PDF document text
    • http://antwerp-reefer-tournament.be/argt/files/zedawipivatas.pdfIn PDF document text
    • https://onlinendttraining.net/files/51838982923.pdfIn PDF document text
    • https://repare-ton-smartphone.com/userfiles/file/50861379615.pdfIn PDF document text
    • https://oreopay57.com/ckfinder/userfiles/files/3540853532.pdfIn PDF document text
    • http://2017.letnifestiwal.pl/ckfinder/userfiles/files/36731590951.pdfIn PDF document text
    • http://ahjygjg.com/upload_fck/file/2021-9-7/20210907181331622142.pdfIn PDF document text
    • https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/cb2550f4407defac8e9750b35b3a8803/kiwofukudaxumusa.pdfIn PDF document text
    • https://theipbuzz.com/images/file/17817118403.pdfIn PDF document text
    • http://pastadimatteo.com/ckfinder/userfiles/files/78821113313.pdfIn PDF document text
    • http://ambvetbrashersclavoghisu.eu/userfiles/files/rogakesabatifal.pdfIn PDF document text
    • http://vako.vn/app/webroot/uploads/files/rituzafu.pdfIn PDF document text
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613387bc65aaa---19634643896.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e4a4d10c0f---20235338261.pdfIn PDF document text
    • https://jeevadhara.org/work/london/userfiles/file/56988155087.pdfIn PDF document text
    • https://sharks-cz.cz/images/file/24202687519.pdfIn PDF document text
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b91dac87b3---xaxamidazu.pdfIn PDF document text
    • https://educationindiajournal.org/ckfinder/userfiles/files/kinireluzizopilesobogagek.pdfIn PDF document text
    • http://zhxndl.com/uploadfiles/files/jukunogaloruroxu.pdfIn PDF document text
    • http://wxhsbl.com/ckfinder/userfiles/files/20210911_185551.pdfIn PDF document text
    • http://cozycornerexpress.com/uploads/files/fumadowuxurit.pdfIn PDF document text
    • http://vishwkarmaenterprises.com/webroot/img/userfiles/files/gefepojewiji.pdfIn PDF document text
    • http://gr-chem.com/upload/files/jivabokoxisa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=beauty+and+the+beast+violin+sheetPDF 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_off0000eaeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAEB 18880 bytes
SHA-256: 56dbfb834e561b22a4304cf81ead68a5b6f75c3ac0d1490ed77e941e8b2063ee
font_01_sfnt_off00011cc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CC8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000134df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134DF 10716 bytes
SHA-256: d1d58c433bd26f51d4d86726a84dd62bd89e7eb563f314830a5e3fe33bf050bb

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