Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1c71268b605dcbe…

MALICIOUS

PDF

84.3 KB Created: 2021-07-14 08:20:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: f53d97a2e9679ed22db938aa0cfa2d52 SHA-1: 276989eb79b001ea2e1f76b0ad75cb23d8660c1b SHA-256: f1c71268b605dcbed5ca9dc1f56bf57a43bf5515c8c97ad45f6c7cdc3c0bc664
156 Risk Score

Malware Insights

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

The PDF file contains a link farm pointing to numerous other PDF files hosted on various websites, many of which appear to be compromised. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. The presence of multiple external URIs and link farms suggests an attempt to obscure the ultimate destination or to manipulate search engine results.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 https://falconshipping-uae.com/userfiles/files/sarakavinipugiz.pdf In PDF document text
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/1609fc03682c7e---87083605373.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/tutivotoruwobinufulej.pdfIn PDF document text
    • http://brmhn.com/userfiles/file/20210705140457_7pmdsm.pdfIn PDF document text
    • https://erinmillssmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/4c0aosr0ndu12qbtd95b56q5u3/fedika.pdfIn PDF document text
    • https://fellowpeo.com/wp-content/plugins/super-forms/uploads/php/files/006048af81f4435010f1fdb63d13b984/58745595187.pdfIn PDF document text
    • http://afghansolar.com/userfiles/file/likuxifapunijuwap.pdfIn PDF document text
    • http://hrzservices.com/uploadfiles/file/fekupiruxekebisafigov.pdfIn PDF document text
    • http://voijin.com/userfiles/files/34954870969.pdfIn PDF document text
    • http://witnesstherealist.com/wp-content/plugins/super-forms/uploads/php/files/4989897ea4361395bf4c5d7c812a2ffe/govewu.pdfIn PDF document text
    • http://chocolatycakes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6e449e7d13---goraxamevoj.pdfIn PDF document text
    • http://md-servicios.com/userfiles/file/xaxupanoma.pdfIn PDF document text
    • https://www.corridar.com/wp-content/plugins/super-forms/uploads/php/files/9l866oovnvj1budngrtotfmirc/96851928045.pdfIn PDF document text
    • https://inlandautorepairmurrietaca.com/wp-content/plugins/super-forms/uploads/php/files/0e07a1c2ec9edc942929fefdd6927222/71547869481.pdfIn PDF document text
    • http://mimarkamilozkartal.com/userfiles/files/60701631014.pdfIn PDF document text
    • http://falerisztika.hu/tmp/sadixaravorizogu.pdfIn PDF document text
    • http://masseydogs.com/clients/f/fc/fc2e217ffa4851e49ca3cd921a15cf41/File/84833727858.pdfIn PDF document text
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160bd8074cc03d---xibukoxaluluzozofore.pdfIn PDF document text
    • http://csc0451.com/userfiles/file/20210619175330_80kl7n.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d54474e84f7---46694762425.pdfIn PDF document text
    • http://gorisum.net/fckeditor/upload_file/file/66391510849.pdfIn PDF document text
    • https://www.hediyevideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9bea37eb5d---5588797536.pdfIn PDF document text
    • http://www.chubsorn.com/file/files/nogawevepenamovaz.pdfIn PDF document text
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/f72966108e32c51e900a1295e31f58b1/68049555321.pdfIn PDF document text
    • http://vitalenzyme.com/uploads/fckupload/file/54202400709.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=8th+beatitude+meaningPDF 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_off0000e81d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE81D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001002f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1002F 16340 bytes
SHA-256: 4f69a1f8d234da4c6f51e1b459f242f7ffbaaae6e3d1d14bc16250c4fdf2098b
font_02_sfnt_off00012a7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A7F 10612 bytes
SHA-256: ec8116d18dfbabebd2b281fec55956eefa3133ee59d0e0945df31e7666fd7712

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