Malicious PDF — malware analysis report

Static analysis result for SHA-256 686b3cf539e57d48…

MALICIOUS

PDF

100.4 KB Created: 2021-06-30 05:20:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 1f7758ef554cd9677bd152ef224a5713 SHA-1: a2ace5e91314d9d3f5aa5dd4f3af0aac1581034c SHA-256: 686b3cf539e57d480d6ddfe491b460e6096ae842cb971b577d7f61988086e421
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links, many pointing to compromised WordPress upload directories and disposable hosting, suggesting a link farm or phishing lure. The presence of these links and the heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly indicate the document's purpose is to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9922

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://www.multigacos.com/admin/uploaded/fck/file/rosonakidomijajezasok.pdf In PDF document text
    • http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e9010c906e---jubumuwefefo.pdfIn PDF document text
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/16090eb407a087---gijasorizaxo.pdfIn PDF document text
    • https://wlao.on.ca/wp-content/plugins/super-forms/uploads/php/files/d8cf3da0beec96862e1108398edc1f11/kapifevobimeditipinos.pdfIn PDF document text
    • http://ebsenglish.net/_UploadFile/Images/file/41258984501.pdfIn PDF document text
    • https://member-amz-seller-system.de/wp-content/plugins/super-forms/uploads/php/files/aa0c46f1ebe68068c53e9b48613b04f0/wumupatiwog.pdfIn PDF document text
    • https://www.icslights.com/wp-content/plugins/super-forms/uploads/php/files/af5f467f7fb97ccbe5651d9933f61db4/19101047818.pdfIn PDF document text
    • https://www.sanier.pl/wp-content/plugins/super-forms/uploads/php/files/saomoem6qdd1vm5hotjhjgcns3/fatugufupikavaraxuduz.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/16076244328b5f---gonesubomiw.pdfIn PDF document text
    • http://kojeneckezbozi.eu/userfiles/file/79467588393.pdfIn PDF document text
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609279c5aa694---netinujetowuwat.pdfIn PDF document text
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a459c1b9c62---tipadivin.pdfIn PDF document text
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/a4b32ad81088f21cf008dde5f7054962/xulifatol.pdfIn PDF document text
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/cbe749f5b043dc40c0162cffc0cd3308/59474928707.pdfIn PDF document text
    • http://fotossc.pl/_files/file/narosu.pdfIn PDF document text
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/b8ec3077ae0a4fd541f48bc7d603508f/64795463976.pdfIn PDF document text
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/c7d18d4ec9ddc337033e39f86f67ff8c/wusiworarimukafex.pdfIn PDF document text
    • https://lsp.od.ua/wp-content/plugins/super-forms/uploads/php/files/vn2aiasvm8634kg5rukv5nlvb7/96447331746.pdfIn PDF document text
    • https://b2cexpressdemo.com/userfiles/file/jugipuxuvoxazaj.pdfIn PDF document text
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160911cbb064a3---ruwarafafikabelorebab.pdfIn PDF document text
    • http://bet-balance.com/userfiles/file/sikateguviluwuzoduw.pdfIn PDF document text
    • http://thebellingerfamily.com/clients/0/05/05034faaa501c69409a7459485cba135/File/toguxemiwavejoposebevuvo.pdfIn PDF document text
    • http://geometrarontani.it/userfiles/files/refogowezuliful.pdfIn PDF document text
    • https://www.penyembuhanholistikreiki.com/wp-content/plugins/formcraft/file-upload/server/content/files/160da7f86c6907---kudenizesizenaxukunuwoza.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160962fec2c36c---lageponig.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=lilac+flower+smellPDF 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_off000123ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123EC 18160 bytes
SHA-256: 4409c904574e7a49bde81593efd11d42ec2ae40c9fb4a329d52ef07934bac851
font_01_sfnt_off0001536d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1536D 10340 bytes
SHA-256: 7fcd734cfe8252fb2d8888661e3ff53687d89abe134ce6f1b3f7f6f52ce5238b
font_02_sfnt_off00016ad9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16AD9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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