Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab7d95cc4c8662fe…

MALICIOUS

PDF

80.2 KB Created: 2021-09-10 19:21:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: c513a0453d88ba1cf9be7fc3c017d8c6 SHA-1: cf4d40e75763b18519986600b03f9eb82f50471d SHA-256: ab7d95cc4c8662fe28a1418160024d7f2c8f3973ae09155a2de85526cf2256b1
156 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, pointing to multiple compromised CMS upload locations and disposable hosting sites. The embedded URLs suggest an attempt to redirect users to download further content, likely malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://spielundlicht.de/content_provider/documents/files/42887062669.pdf In PDF document text
    • http://myoffice2561.sesao33.net/UserFiles/File/16990040691.pdfIn PDF document text
    • http://gamjagolla.com/uploads/files/45731110279.pdfIn PDF document text
    • http://www.ciesol.com/ckfinder/userfiles/files/jeburuwilagifumad.pdfIn PDF document text
    • https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/16133470b8ddf4---61968694168.pdfIn PDF document text
    • http://geodez.com/pliki/file/musunadoxozepozu.pdfIn PDF document text
    • https://fortworthdental.net/cmsCart/upload/file/vumixenos.pdfIn PDF document text
    • https://ckfinder.pamlskovnik.cz/ckfinder/userfiles/files/36485991846.pdfIn PDF document text
    • http://icmasistemas.com/userfiles/files/wugesepeweted.pdfIn PDF document text
    • http://malovanesklomh.cz/images/file/zewugadezofidofuwajiwajik.pdfIn PDF document text
    • https://permargi.com/files/galeria/files/zomofagagobamudaruwokesas.pdfIn PDF document text
    • https://tekstilkentrehber.com/upload/ckfinder/files/93349856054.pdfIn PDF document text
    • http://www.gcsystem.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16130e8b128a6d---govosekumejewow.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f9351029f1---71625018172.pdfIn PDF document text
    • https://www.ccs-corporation.com/ckfinder/userfiles/files/90983602057.pdfIn PDF document text
    • https://giraffeng.net/infodaily/gen-ckfinder/userfiles/files/pupusogaxejo.pdfIn PDF document text
    • http://hbaoge.com/upload/files/tijunufiteriwefawi.pdfIn PDF document text
    • http://e-skala.pl/userfiles/file/gitaxeramikalika.pdfIn PDF document text
    • http://studiolaviano.it/userfiles/files/vejeledusevi.pdfIn PDF document text
    • http://studiobaldizzone.com/userfiles/files/38495157603.pdfIn PDF document text
    • http://pc580.cn/upload_fck/file/2021-9-4/20210904124946561542.pdfIn PDF document text
    • https://chokysitohang.com/Uploads/userfiles/files/gewuxebemepamivobu.pdfIn PDF document text
    • http://preiss.at/upload_files/files/pifuzawozanewipe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=five+nights+at+candy%27s+3+android+downloadPDF 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_off0000cb0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB0D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e324.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE324 11096 bytes
SHA-256: 2a5117d8b78133c9b6e96fedfc91c0d865dcc47c8cf1d34204a825a0c54e8186
font_02_sfnt_off0000fcea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCEA 20424 bytes
SHA-256: 8c498dbb5204e2b844d4d9e68797738140642542d211a101a8f645775278bda9