Malicious PDF — malware analysis report

Static analysis result for SHA-256 39736704de3a0ce4…

MALICIOUS

PDF

84.9 KB Created: 2021-08-20 19:11:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-18
MD5: d383a210b406bd90511b947d58863de7 SHA-1: 6932a0ed2c7550a22457320ea266cddcdf98b3db SHA-256: 39736704de3a0ce45be0c5ddebfd3984fd042243257058b32f21cd2cffcabace
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e0d6019b309---gowilozokam.pdf In PDF document text
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160ff16bf6435f---17273673060.pdfIn PDF document text
    • http://erbilsunhotel.com/wp-content/plugins/super-forms/uploads/php/files/lc2jtc7v5fndd22nihpunvqfd5/monepoja.pdfIn PDF document text
    • https://masukpt2.com/contents/files/zexibidum.pdfIn PDF document text
    • http://vipforiraq.com/userfiles/files/tasozeka.pdfIn PDF document text
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607aba7005e50---89775321616.pdfIn PDF document text
    • http://barudan.hk/UploadFile/file/20210615220109815.pdfIn PDF document text
    • https://sarvodayasamaj.uk/upload/files/zosuronilotopuli.pdfIn PDF document text
    • http://pc580.cn/upload_fck/file/2021-8-8/20210808120359991596.pdfIn PDF document text
    • https://balance-global.com/wp-content/plugins/super-forms/uploads/php/files/rf6t32mqcui3bopbeetb4f3gpt/peralasikokujekuj.pdfIn PDF document text
    • http://netinflux.net/userfiles/file/41176149721.pdfIn PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608191e946e25---fukamotefatoremavageg.pdfIn PDF document text
    • http://bmhs71.com/clients/c/c9/c97ff408e01126d63256cf68004d6641/File/pibisumotobudavazutonexu.pdfIn PDF document text
    • http://insidethedigitaltrend.biz/userfiles/file/voripoxi.pdfIn PDF document text
    • http://kirilmazbardak.com/userfiles/file/38189612553.pdfIn PDF document text
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/ee9819e3afe8ab5a7e9e3f27889885d2/11091753031.pdfIn PDF document text
    • https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/9bcb68c669569e34b4bde71e899e2622/nedolusemif.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1606d543aa400c---sikato.pdfIn PDF document text
    • http://vanxuantravel.com/upload/files/16517678469.pdfIn PDF document text
    • https://fid-data.fr/app/webroot/uploaderfiles/puzoziwadudutiziribebij.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c7c0be6e819---27434850573.pdfIn PDF document text
    • http://musorcentrum.hu/files/article/file/xotapemufebelunorofi.pdfIn PDF document text
    • https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/f53b9cd8391470804d327c2e7166936b/vopifo.pdfIn PDF document text
    • https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/gv5rttlr04b4rlants6qhuc695/87956753190.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=game+theory+an+introduction+steven+tadelisPDF 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_off0000e852.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE852 16924 bytes
SHA-256: f676afb673f690b06955a6ab3431db7977e1073a74017bc492825d80bc2816f8
font_01_sfnt_off000113f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113F4 10952 bytes
SHA-256: 7c9d4ab0da64f5e911835b76082af13993abdf2ff4c2cf26b0227fb9433639ac
font_02_sfnt_off00012d3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D3D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1