Malicious PDF — malware analysis report

Static analysis result for SHA-256 a489b63b6dff8017…

MALICIOUS

PDF

68.1 KB Created: 2021-09-18 01:58:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d527b7f97e0ea26b91660bae8649eb20 SHA-1: 2f7527d602f7f5f2bd4e7750b7f19f7587bb22da SHA-256: a489b63b6dff80176b819296ba11fed113f44b9274e74fbe91aab3c966fded7c
164 Risk Score

Malware Insights

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

This PDF contains embedded JavaScript and a large number of external URIs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

Heuristics 7

  • 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.
  • 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 https://huntic.ru/uplcv?utm_term=can+i+download+more+widgets+for+android
    • http://bagiez.com/userfiles/file/wukuvasugosumijizobewijo.pdf
    • http://wwm-quanta.com/upload/files/19854848447.pdf
    • http://chaodontuonglai.vn/uploads/ck_upload/files/nedijapixinosobimuxidi.pdf
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/e508b22a6d7af90261bcbea9d7926609/lisitogusupatavi.pdf
    • https://staffxrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/d65db937f101a87c385d9e82325a4f19/66725160415.pdf
    • https://thisissati.com/userfiles/files/82546157388.pdf
    • http://identik.hu/editor_up/jigosazesepagadakajesuve.pdf
    • http://word.mn/uploads/assets/93652115750.pdf
    • https://brune-schmuckwerk.de/ckfinder/userfiles/files/mewesojitalawumetuz.pdf
    • https://tamtam.com.ua/wp-content/plugins/super-forms/uploads/php/files/12b7b8387318f4e9478f06de80e75f80/degafavigawapumefogeneze.pdf
    • https://praktijk.zorglink.nl/ckfinder/userfiles/files/14529421308.pdf
    • http://fsgpj.com/upfolder/e/files/20210911084513.pdf
    • https://godparents4tz.org/home/god/public_html/ckfinder/userfiles/files/39872508017.pdf
    • http://around-sicily.net/userfiles/file/kabebametibemuf.pdf
    • http://asupuro.com/upload/save_image/files/nonekaxomipobosatobolela.pdf
    • https://cfacgroup.com/uploads/FCK_files/file/9903593402.pdf
    • http://scuderia512.com/js/upload/files/89973593428.pdf
    • http://obrienbuilders.com/userfiles/file/13320075694.pdf
    • https://tlkingatlan.hu/kepek/other/file/80600262255.pdf
    • http://oecschool.com/userfiles/file/supogufe.pdf
    • http://uk-finansist.ru/userfiles/file/lozaluvaxe.pdf
    • https://caror.hu/ckfinder/userfiles/files/17566523810.pdf
    • http://chono.mn/uploads/userfiles/files/vifusedijunawotoma.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ae37.bin
1d9969ca03f01756b4cade9779511df0ece5cbaf08eba612ebaab8f76888017f
pdf-font-stream PDF embedded font (sfnt) at offset 0xAE37 14284 bytes
font_01_sfnt_off0000d1f7.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD1F7 16792 bytes
font_02_sfnt_off0000ea0e.bin
ce09bc1267120ea0cb2096e9dcfd7e87cdacb561c5634767c8844682ce93ec33
pdf-font-stream PDF embedded font (sfnt) at offset 0xEA0E 10812 bytes