Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ad121cfd0781655…

MALICIOUS

PDF

87.0 KB Created: 2021-07-21 00:22:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8b46ecb262cd9538c3c4a060f31430cd SHA-1: 04911cd575ce8156506a6d14e8782a4869707d53 SHA-256: 8ad121cfd0781655bcd226b0ac7d15e3fb1911aa7dd4244d7b3c0568c3da8f2a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The sample was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to numerous external URLs, many of which are hosted on compromised CMS platforms or disposable domains. The primary goal appears to be directing users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 http://naasschoolofmotoring.com/fckeditor/userfiles/file/gixifolalivomizi.pdf
    • https://ajwatravel.com/wheelmarine/userfiles/file/zamogufagakugumukumuvu.pdf
    • http://norilskgu.ru/userfiles/file/29415524933.pdf
    • https://mrmobilewebsite.agency/wp-content/plugins/super-forms/uploads/php/files/fde4118040dd932729abb9b8b9fc9fc5/kavivojemitalagekodunem.pdf
    • https://takiminsahada.com/wp-content/plugins/super-forms/uploads/php/files/p19ra05vv19h4k8fi4o9o12t28/1864133005.pdf
    • http://hi-reid-solutions.com/wp-content/plugins/super-forms/uploads/php/files/9774e27168466a9a8419fe2c350095b7/29385904756.pdf
    • https://banktapeunadana.com/tapeunadana/bank2/admin/userfiles/file/kizujufiwunozi.pdf
    • https://www.travelticket.com.au/wp-content/plugins/super-forms/uploads/php/files/d6n5di3pi1u4lt62u1mea376h5/lagodutude.pdf
    • http://07-3739589.com/CKEdit/upload/files/gifatope.pdf
    • https://www.vedaaz.com/wp-content/plugins/super-forms/uploads/php/files/06ccc39e601324ec9fd81e9681526912/41260940883.pdf
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160e8f10245157---sixetidodawuxepazagumel.pdf
    • http://brookhavenclassof1967.com/clients/0/0c/0ca802fc87877f8c548ddf85495caeb2/File/zedivurabajalatuguwo.pdf
    • http://avtoarka.ru/wp-content/plugins/super-forms/uploads/php/files/4fdfbe928b5ff251eca2b1b0ade2b3a3/tijebakoruzi.pdf
    • http://jncs.kr/page_data/file/20210521213054.pdf
    • http://marasintl.com/public/ckfinderuploads/files/pudaritikuxarokobagow.pdf
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160926a22422ba---morufidexotalovemewewi.pdf
    • http://analogsys.com/uploaded/file/1122942377608e9f3815fac.pdf
    • https://kfz-gutachter-oliver-schiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c209d395a46---83179087552.pdf
    • https://jahanchart.ir/data/files/file/vubaguvila.pdf
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/a8fb1de6b9f8070c4de73024e7430f16/kibidatojafabatez.pdf
    • http://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/974117ea4e4f16d51cfbebf7614a0122/dagifiviketufabakomoxofe.pdf
    • http://re-view.online/fckFiles/file/72563466522.pdf
    • http://loveforlungs.com/clients/a/a9/a9a80f3a93b7553e0860ec1960497db0/File/xedizumevutelos.pdf
    • http://sangiorgioautoservizi.com/userfiles/files/56982974384.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=abstaining+from+alcohol+meaning
    • 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_off0000f1f5.bin
4dc70ccb9619e0c8766dceecb29b1b9fe453bc1652045defd17db727ba906742
pdf-font-stream PDF embedded font (sfnt) at offset 0xF1F5 10904 bytes
font_01_sfnt_off00010b13.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10B13 16792 bytes
font_02_sfnt_off00012325.bin
3cbb1d2ea41c2f08a49d0b97a3e81e055236d97bf4c9a77ade3954526d97eb4e
pdf-font-stream PDF embedded font (sfnt) at offset 0x12325 16720 bytes