Malicious PDF — malware analysis report

Static analysis result for SHA-256 28b753bbb04a7b9d…

MALICIOUS

PDF

83.5 KB Created: 2021-09-04 15:48:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 930e97709c7ca735846dc5b01f4fc329 SHA-1: 10500a68677b7b633a891a209e3f8287ff17f69f SHA-256: 28b753bbb04a7b9d5f83a2f5ddcb3fb1a6fea03578dbf64cf260d2e159e2935f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many of which are hosted on compromised or disposable domains, suggesting a link farm or phishing lure. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' further supports this. Although no scripts were explicitly extracted, the nature of the links and the overall detection suggest it's designed to redirect users to malicious content.

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://masseydogs.com/clients/f/fc/fc2e217ffa4851e49ca3cd921a15cf41/File/buganojupada.pdf In PDF document text
    • http://sinoorchids.com/image/file/14488772339.pdfIn PDF document text
    • http://www.cerathai.com/image/upload/File/sirupojodizudunagageviso.pdfIn PDF document text
    • http://nwatchonline.net/userfiles/file/97314833069.pdfIn PDF document text
    • https://tidaksusah.com/contents//files/8590651626.pdfIn PDF document text
    • https://tresonance.org/uploadfiles/waziguxovilu.pdfIn PDF document text
    • https://sharidendesignasphalt.com/wp-content/plugins/super-forms/uploads/php/files/8de97938f8062c6c98ccecf419757b8a/6660151133.pdfIn PDF document text
    • https://xn--z4qq44i.tw/upload/actfiles/tetikoterawonowera.pdfIn PDF document text
    • http://goodwill.pl/userfiles/file/lunuzefawifidazuxuwoker.pdfIn PDF document text
    • https://atesolve.com/ckfinder/userfiles/files/lasobijaj.pdfIn PDF document text
    • https://www.kadeavenue.com/wp-content/plugins/super-forms/uploads/php/files/36d5842e89ab7fd14925b42cf818509d/72406958155.pdfIn PDF document text
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a108de095b5---zunevokufilokiriga.pdfIn PDF document text
    • https://www.dishdivvy.com/wp-content/plugins/super-forms/uploads/php/files/b1f0c7fda71d813aca7c94303a9db9fb/97840300786.pdfIn PDF document text
    • https://ariconium.cz/webpagebuilder/ckfinder/userfiles/files/57180657149.pdfIn PDF document text
    • http://cityhelps.org/clients/6/61/61afa7a028a8e04f14432b0fece6f2b0/File/39101478801.pdfIn PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1793975c8f---3912718072.pdfIn PDF document text
    • http://zzliuxue.com/upfile/file///jotedibiguragopefum.pdfIn PDF document text
    • http://stellar-toys.com/ckfinder/userfiles/files/5439262076.pdfIn PDF document text
    • https://vpmemorial.net/images/file/pogujutepezize.pdfIn PDF document text
    • https://chetanaus.org/bheru/uploadfiles/file/fatevinuf.pdfIn PDF document text
    • https://etre-cheval.fr/Applications/MAMP/htdocs/etre%20cheval/news_pix/file/94620374950.pdfIn PDF document text
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606d7f0aa0327---90397967496.pdfIn PDF document text
    • http://mp-hd.de/data/aktualnosci_imgs/file/86040666240.pdfIn PDF document text
    • https://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/5406bcf091cb65dc39e384c82c37c51b/nufulazan.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=calidad+de+vida+pdf+unamPDF 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_off0000dc73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC73 10372 bytes
SHA-256: 63d3f6e68ca5f6b0faf27d11524515aa63e725c78fe0d50724fa7abf48e53d44
font_01_sfnt_off0000f3d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3D9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010beb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BEB 19944 bytes
SHA-256: b40b2b70ca61c590986f9a390f175f8476efe04923a775e33c73a82bad3b5647

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