Malicious PDF — malware analysis report

Static analysis result for SHA-256 885fe3819587ba97…

MALICIOUS

PDF

75.3 KB Created: 2021-09-15 21:48:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: fdee04eaa462a9491cb286fbba11747a SHA-1: b18039ef3b6befe4910f00e3a8f7fb4ce87d3df5 SHA-256: 885fe3819587ba9775eba35fbec2504b414a00aef122f27b0bb9efa68eeb2a7a
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to compromised or disposable hosting, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body is heavily obfuscated, preventing a clear understanding of its direct user-facing content, but the link farm structure is evident from heuristics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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 https://laborke.ru/uplcv?utm_term=free+renown+booster+codes PDF link annotation
    • https://sensesgrouphk.com/louis/STARKGROUP/ckfinder/userfiles/files/10508096174.pdfIn PDF document text
    • http://globalone-mould.com/gbw/fckfiles/20210906235227.pdfIn PDF document text
    • https://euinsuti.ro/app/webroot/files/userfiles/files/55709444619.pdfIn PDF document text
    • http://ndt-ultratech.com/files/jetulofeg.pdfIn PDF document text
    • http://reclaimsplus.com/wp-content/plugins/super-forms/uploads/php/files/c7157a102e317261e33bc7145aeac352/28689129867.pdfIn PDF document text
    • https://mamadona.ru/ckfinder/userfiles/files/33118777843.pdfIn PDF document text
    • http://cokhihoaiduc.com/uploads/files/55789616504.pdfIn PDF document text
    • http://redskap.ru/userfiles/file/53182653617.pdfIn PDF document text
    • http://alacartedesign.de/userfiles/file/marutigu.pdfIn PDF document text
    • http://bjsddesign.com/filespath/files/20210904222903.pdfIn PDF document text
    • http://ozgu-yapi.com/firma/files/jubawovojefulisosemuj.pdfIn PDF document text
    • https://clearpatth.com/userfiles/file/48790772117.pdfIn PDF document text
    • http://szpk.hu/_user/file/93279953355.pdfIn PDF document text
    • https://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613338eb5abb3---zevirefizifasivevux.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131518ee3adf---51082122854.pdfIn PDF document text
    • https://socialacademy.gr/wp-content/plugins/super-forms/uploads/php/files/e1212a30214f84aaffa7d8e8ff928fa1/bujokaka.pdfIn PDF document text
    • http://pescepiana.eu/userfiles/files/33404132461.pdfIn PDF document text
    • http://dailitara.lt/bites/uploads/file/togizelijojo.pdfIn PDF document text
    • http://www.mmalappeenranta.com/tiedostot/files/26585916419.pdfIn PDF document text
    • http://jinyudachem.com/upload/files/5220253738.pdfIn PDF document text
    • http://f-kcc.jp/user_data/userfiles/files/xeparunepomu.pdfIn PDF document text
    • https://www.info-service.com.tw/plugin/ckeditor/ckfinder/userfiles/files/9461625582.pdfIn PDF document text
    • https://cfaegaianascente.pt/portal/userfiles/files/43063905282.pdfIn PDF document text
    • http://www.synagoge-stommeln.de/ckfinder/userfiles/files/wafotuzovo.pdfIn PDF document text
    • https://butchercurnow.com/img/shop/contents/65679322552.pdfIn PDF document text
    • http://women-for-marriage.com/ckfinder/userfiles/files/21709454557.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c2c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2C6 17216 bytes
SHA-256: 3a87c4079d639f0187d65f2f796315b11dc8e83d6c3f67d8514700a60a0f1637
font_01_sfnt_off0000efe0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFE0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000107f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107F7 10264 bytes
SHA-256: 03078ef958b8c3ea2db26872e8c702b81361945ad4a9658e68ddb0d48daaaa65

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