Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e754f5e562842b8…

MALICIOUS

PDF

95.3 KB Created: 2021-09-06 01:09:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 2107517d5710bf2b2a7a2c8b82c66aa1 SHA-1: 5c983bca83454551cdf2e9c44c8dd18779a9ae55 SHA-256: 4e754f5e562842b89f9cbeba22fbc40b40e29a63d3eae594d2d683febfcac7dc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a large number of links pointing to various unknown PDF files hosted on compromised or disposable domains. This behavior is indicative of a link farm, likely used for SEO manipulation or to distribute malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, and the presence of external URIs points towards potential exploitation or redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://aodaixuan.vn/app/webroot/upload/image/files/66017593222.pdf In PDF document text
    • https://valstybestarnyba.com/upckfinder/files/puwufofotabulizob.pdfIn PDF document text
    • https://hoya.hr/UserFiles/file/26626255706.pdfIn PDF document text
    • https://comesa.com.pe/wp-content/plugins/super-forms/uploads/php/files/eili2rrtt9aboau215rhp4cdo1/24097220845.pdfIn PDF document text
    • http://tradeweb.es/userfiles/file/gudowojutuwunenedelup.pdfIn PDF document text
    • http://druckmaschinenservice.com/uploads/fce/files/79299760497.pdfIn PDF document text
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/ac819b18935e8ea4d78147895eef6a01/83438587421.pdfIn PDF document text
    • http://centromedicoveterinarioadda.com/userfiles/files/foretifatinagirigagun.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a56a21a9950---74657419032.pdfIn PDF document text
    • http://domario.ru/userfiles/file/ludiwaranowinofoga.pdfIn PDF document text
    • http://ed-union05.ru/files/file/jogiwenirisejo.pdfIn PDF document text
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160afca572ba06---97155501579.pdfIn PDF document text
    • http://ansing.nl/userfiles/file/jodorifoviwipotijes.pdfIn PDF document text
    • http://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/cb8308a90a56b1c8851d12c8d98d70aa/degiwovibatesowitifonosu.pdfIn PDF document text
    • http://dgjst.com/upfile/file/nujog.pdfIn PDF document text
    • https://apparel.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/a050e47ad97e7dd610b5dc23c0a6d00b/91556123740.pdfIn PDF document text
    • https://ilc.ua/wp-content/plugins/super-forms/uploads/php/files/9a95opr9n9gj36o3g3qtsmc9a6/pidaxivotipe.pdfIn PDF document text
    • http://uniroll.pl/user_images/file/91657778728.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094c76ede8f7---paxedojobiwekabifedud.pdfIn PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093550004774---32118740730.pdfIn PDF document text
    • http://vanprodukt.cz/UserFiles/File/zazabetamodip.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077340831395---jilatirokilofukilixabas.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=yeats+poetry+pdfPDF 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_off00010f7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F7A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001278c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1278C 18780 bytes
SHA-256: 345ad083dee86b38cb16020d742e39014833d1eef8663537b81cdacc1d1f5a9b
font_02_sfnt_off00015833.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15833 10344 bytes
SHA-256: 7af5036c8df4c1e872e4224c9458907dd29159912fb1309dbaa69e6b75fbcb0b

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