Malicious PDF — malware analysis report

Static analysis result for SHA-256 518a5eb695f6c918…

MALICIOUS

PDF

81.6 KB Created: 2021-09-05 18:56:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: c0a785d39222723d11583385f696dd2d SHA-1: 9bab099a0c854d80ca1b62ac132780c837073c88 SHA-256: 518a5eb695f6c9186d8b8168eebbd1e566900c3f64554f3ead94e5df1234fe86
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a link farm pointing to multiple domains, many of which are hosted on compromised WordPress sites or disposable hosting, suggesting an attempt to distribute malicious content or phish for credentials. The presence of embedded URLs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic further support the attack pattern of using a deceptive document to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://autosaloncenter.com/uploads/file/nafuxokinoxasob.pdf In PDF document text
    • https://dazzlin.co.uk/wp-content/plugins/super-forms/uploads/php/files/80555a03eae61e088bdefbe0b5b4fa01/20969303901.pdfIn PDF document text
    • http://zuche0551.com/upload/file/nexofomubefuwogijo.pdfIn PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609650ff20412---54681798162.pdfIn PDF document text
    • https://concertwristband.com/resimler/files/jifubotonizewapomabe.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d97bd6e16f.pdfIn PDF document text
    • http://mfcwestenkwartier.nl/beta/userfiles/file/gakawamovuvadexuvok.pdfIn PDF document text
    • http://fxmeat.com/upload/file/988c9e26c97276228f24567fefafc802.pdfIn PDF document text
    • http://centralwestwoodclassof1983.com/clients/c/cd/cd4b3c89dd1500142a52f05b9125c350/File/taketaramezezi.pdfIn PDF document text
    • http://3dprofi.net/images/uploads/file/91725542426.pdfIn PDF document text
    • http://0965818789.com/CKEdit/upload/files/gepetuz.pdfIn PDF document text
    • http://aj-freight.com/ckfinder/userfiles/files/25199207980.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/6df797b99ad7ebd2ed2a5b1ac7410f49/73602824467.pdfIn PDF document text
    • http://scuderieverdina.it/scuderia/userfiles/file/56405660234.pdfIn PDF document text
    • http://www.onlinetemsilci.com/wp-content/plugins/formcraft/file-upload/server/content/files/160835863d849d---60748556425.pdfIn PDF document text
    • https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/f30i6bvp1qi82tkhroefjdlo9l/15560589256.pdfIn PDF document text
    • http://amghanoi.com/images/ckeditor/files/kubuzutudute.pdfIn PDF document text
    • https://admonks.ru/wp-content/plugins/super-forms/uploads/php/files/36b1a80515eaf5c6f61abfb1eb494bf5/dilukoseg.pdfIn PDF document text
    • http://aryajob.com/user_upload/file/rojugefijusosoz.pdfIn PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/160adc68197b8d---kosolediboke.pdfIn PDF document text
    • https://dmvassociates.com/wp-content/plugins/super-forms/uploads/php/files/c2f8b16ed63a31f67505abfc479e2005/dobaxaluwazere.pdfIn PDF document text
    • http://somsit.com/ckfinder/userfiles/files/gufaxuvugejuwaxofalug.pdfIn PDF document text
    • http://architects-desk.com/uploadsfile/vifojofuduletipi.pdfIn PDF document text
    • https://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/90a4caa333cf906de2e8e28b5449b679/tobufobaritikasixu.pdfIn PDF document text
    • https://amenagementsoleil.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087c2b3b4623---zulavasojobejifok.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=pdf+to+excel+converter+download+full+versionPDF 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_off0000db3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB3B 10824 bytes
SHA-256: d3c5002dd7eac392630c531ef4759974653d03befe0b8235addb58404e08ed49
font_01_sfnt_off0000f46d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF46D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010c7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C7F 16980 bytes
SHA-256: d209ef3cab65934d17010028e3a47cd32b3f9e490dd92cf06271974c576a10f9

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