Malicious PDF — malware analysis report

Static analysis result for SHA-256 7fdd76fb3d97ef69…

MALICIOUS

PDF

91.4 KB Created: 2021-09-06 17:51:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: d05ae7b11021b7ee920696ceb370a64a SHA-1: da46465026a04b2cfb53b8aaaff9a4b6cc55a64b SHA-256: 7fdd76fb3d97ef694ef150f295f0691cfeb2ac2d7959955943e125a816875f84
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous links pointing to various websites, many of which appear to be compromised or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document's purpose is to act as a link farm, likely to distribute malware or conduct phishing attacks. The presence of external URIs and compromised CMS upload links further supports this malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://aprilboya.com/userfiles/file/mezoroveboduvib.pdf In PDF document text
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080a2f51704d---kitiminazajojoneful.pdfIn PDF document text
    • https://esperanzadeavila.com/fotos/file/besimuwadavojisupiw.pdfIn PDF document text
    • http://houstontca.org/Content/uploads/files/53649847092.pdfIn PDF document text
    • http://bsp-plovdiv.org/ckfinder/userfiles/files/gizolibojarenelakobolagi.pdfIn PDF document text
    • https://ystechpro.com/nbloom/fckuploads/file/bijesoj.pdfIn PDF document text
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/s14m6djiqq4ee8k8bhm7fbuga0/66054562691.pdfIn PDF document text
    • https://www.chartsunlimited.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/160a4431d8508f---vebagaxudalun.pdfIn PDF document text
    • http://trustarshida.co/cache/fck_files/file/4532818355.pdfIn PDF document text
    • https://astoriareiki.com/wp-content/plugins/super-forms/uploads/php/files/c5a82dc8a432ede1841b99a84b2ea781/45491192371.pdfIn PDF document text
    • http://aelma.com/sites/default/userfiles/file/77877103465.pdfIn PDF document text
    • https://knurussian.kr/DATA/upload/files/202108171535373166.pdfIn PDF document text
    • http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c65683b491---58685755875.pdfIn PDF document text
    • https://grandplaza.bg/uploads/assets/file/tenituv.pdfIn PDF document text
    • http://chinajessie.com/seadata/data/uploads/img/file/16282843961.pdfIn PDF document text
    • http://neuragen.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160f0ecab02cd7---xazolulatutinosesasi.pdfIn PDF document text
    • http://tareeapartment.com/user_img/files/4244502504.pdfIn PDF document text
    • http://dobrejaja.com/Upload/file/17040087801.pdfIn PDF document text
    • http://uptownfallschurch.com/uploads/files/lokerewukixom.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/f0c5bcf9b200935d74739d3c27c9d18a/jejixopapubogoxolawemas.pdfIn PDF document text
    • http://thienanglass.vn/upload/files/48469518043.pdfIn PDF document text
    • http://savvyais.com/userfiles/file/65428089299.pdfIn PDF document text
    • http://vstarmp.cn/upload/files/20210710_142116.pdfIn PDF document text
    • http://rethabise.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607b3f46c5911---87366003981.pdfIn PDF document text
    • https://atl-50.com/files/file/kebimirov.pdfIn PDF document text
    • http://radio-salsa.com/php/rs/filesupload/file/16278840499.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=poor+communication+in+the+workplace+pdfPDF 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_off0000ffb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFB0 10996 bytes
SHA-256: 12ce7b21e339df72687ef3b809ca1b3939bb12f5a3051f23b348418f87b11ad2
font_01_sfnt_off0001190c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1190C 17980 bytes
SHA-256: 3b8fcc8c3148a003b620495173ef0461d1d1a806ee186b4edd7c04a890af32b9
font_02_sfnt_off000147fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x147FD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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