Malicious PDF — malware analysis report

Static analysis result for SHA-256 e37daf1a10de0b94…

MALICIOUS

PDF

82.1 KB Created: 2021-09-09 15:14:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: efbb5dab7c0838cc5def4b8f796d10cd SHA-1: 3e43cab0ea37c0f69bf1d925a53a167231495898 SHA-256: e37daf1a10de0b944a03875b084ceb455efc168e3d82367934b34fe8597fa886
164 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to disposable hosting or compromised CMS upload directories, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. The presence of embedded JavaScript (T1059.007) is a common technique for initiating malicious actions within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://albino-pitti.com/pub_img/file/8188406356.pdf In PDF document text
    • https://www.d-table.com/wp-content/plugins/super-forms/uploads/php/files/f3db0110c61aae8ef0b4bdef182b7ac1/sumumowamuponap.pdfIn PDF document text
    • https://asi-filter.pl/files/file/pawopafekufisuzegafopibu.pdfIn PDF document text
    • http://marklaliberte.com/fckupload/file/87494267081.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161361ddc50138---vesuzun.pdfIn PDF document text
    • http://upasamed.org/Content/uploads/files/17834440135.pdfIn PDF document text
    • https://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/b48538998b5036001a85eccc544be5f3/8204995232.pdfIn PDF document text
    • https://hanomanberjaya.com/contents/files/36693175733.pdfIn PDF document text
    • http://tycoonmedical.com/userfiles/file/8444417662.pdfIn PDF document text
    • http://rowerowaszkola.pl/imgturysta/files/68187930455.pdfIn PDF document text
    • http://xinxinhouseware.com/uploadfile/files/jokolujafunemexaza.pdfIn PDF document text
    • https://www.isgs.org/wp-content/plugins/super-forms/uploads/php/files/4e39de31530a5b7beefd9e0b7fd6602d/64052390921.pdfIn PDF document text
    • https://valubil.com/public/uploads/cms_file/cms_files/fanudo.pdfIn PDF document text
    • http://wcsps.com.tw/ckfinder/userfiles/files/81143087217.pdfIn PDF document text
    • https://qatarsecurityservices.com/public_html/userfiles/file/39646851543.pdfIn PDF document text
    • http://pozitron-s.ru/userfiles/file/virenilopimasetigudiboseg.pdfIn PDF document text
    • http://scuderia512.com/js/upload/files/xofazelasixu.pdfIn PDF document text
    • https://hsse.hssanesteban.cl/files/80528222906.pdfIn PDF document text
    • https://gencerenerji.com/resimler/files/98986876221.pdfIn PDF document text
    • https://10glazsikeyrosa.ru/file/texosafomotexejugiv.pdfIn PDF document text
    • http://z-sinpro.com/upload/files/kinufotifatupipu.pdfIn PDF document text
    • https://ahreco.com/uploads/news_file/weninizivabefidalubuj.pdfIn PDF document text
    • http://hla.vn/upload/files/32156039593.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=rupaul%27s+drag+race+vegas+revue+putlockerPDF 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_off0000d9f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9F4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f206.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF206 18300 bytes
SHA-256: 1cb1e63491f99e62539a4d2c5d0794e97f769ddda3d957a1732ff4640c346494
font_02_sfnt_off00012204.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12204 10832 bytes
SHA-256: c9ac2ae479e91a3756f590ef93e5d853884c4d0b4996e2504980a1b0aaac9359