Malicious PDF — malware analysis report

Static analysis result for SHA-256 dfe922f7b15d5864…

MALICIOUS

PDF

97.3 KB Created: 2021-08-11 23:49:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 99cab3c9f7fc6b10045d87898042bb5d SHA-1: 6b9b74bee8a186735b3812269cebdbcbd4569597 SHA-256: dfe922f7b15d5864fb104387128b80a2f77b593bf10414ef487e9922c4b8bf82
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, hosting numerous URLs that point to other PDF files on compromised websites. These secondary PDFs are likely designed to further distribute malware or conduct phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f0da30628b---27408362545.pdf In PDF document text
    • https://interface-graphique.com/upload/editor/file/ximumazamatoxubureduxofo.pdfIn PDF document text
    • http://bajcsidavidfoto.com/_user/file/13349141941.pdfIn PDF document text
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160b4d88bde2b2---lisixuwekuwa.pdfIn PDF document text
    • https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/160806cc3c952d---viwevi.pdfIn PDF document text
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160871acaa5b2b---77622636250.pdfIn PDF document text
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160c2efa6c5da0---28284713551.pdfIn PDF document text
    • https://ofertaromania.ro/ckfinder/userfiles/files/lejomixotanuvap.pdfIn PDF document text
    • http://jjinline.org/file_upload/file/98450228698.pdfIn PDF document text
    • https://transmilenio.net/datamont/userfiles/file/69719432736.pdfIn PDF document text
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/jn6foeu2clqelmjfiosa330p43/supafuv.pdfIn PDF document text
    • http://inannamsao.com/uploads/files/kijiduworoxagufuregilop.pdfIn PDF document text
    • http://kenzoum.org/home/integrity/public_html/ckfinder/userfiles/files/vekagozidatolokejabaro.pdfIn PDF document text
    • http://bukharageorgia.com/sites/default/files/file/53759149529.pdfIn PDF document text
    • https://excore.hu/ckfinder/userfiles/files/77844851266.pdfIn PDF document text
    • https://asharfilalkulfi.com/ckfinder/userfiles/files/64843829943.pdfIn PDF document text
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a38cbb34d92---sigoxepativima.pdfIn PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160bcf8afa5f0c---42260855800.pdfIn PDF document text
    • https://chetanaus.org/bheru/uploadfiles/file/4424274442.pdfIn PDF document text
    • http://mrybalko.ru/files/82198993109.pdfIn PDF document text
    • https://gulfcans.com/home/madarmun/public_html/gulfcans/images/bulk_images/files/41703418126.pdfIn PDF document text
    • https://zevkotodoseme.com/upload/ckfinder/files/88393974403.pdfIn PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/160cdb3bb85617---57063884158.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=how+to+hack+boat+race+in+farmville+2+country+escapePDF link annotation
    • http://s292376414.onlinehome.fr/datas/imgmail/file/pidefelagikowijisidisad.pdfIn PDF document text
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_007_off00013dbd.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x13DBD 18264 bytes
SHA-256: a62d882db4523a61b113ca3b5d2fa3e96cd590e1ab8b0704e02e6837e715ce7b
font_00_sfnt_off0000f26d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF26D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010a7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A7F 21228 bytes
SHA-256: db6cf91d7697bf7cea83a85ec4dbc3b3eb29e286bfa74737e46378052b068a4b
font_03_sfnt_off00015adf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15ADF 11456 bytes
SHA-256: d29c2a47e3bb71736927eb95e0fbea661b515120f3a9638dc44f60addc603cfe

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