Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ea34464167255e4…

MALICIOUS

PDF

84.1 KB Created: 2021-09-08 00:01:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 4102ded32e5d7af8583f1eba1a3234e4 SHA-1: 1b9d4a9957305fcabe94030b827610666fd30034 SHA-256: 7ea34464167255e4f9ab29baba6e2acb2cd93689cd57de629dc3b167bda7f4fa
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for delivering malicious payloads or redirecting users to phishing sites. The PDF also features a link farm pointing to compromised WordPress upload storage and disposable hosting, suggesting an attempt to obscure the ultimate destination of the malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 https://immobilgold.com/file/22520126882.pdf In PDF document text
    • http://wypelnienia.kratex.pl/wp-content/plugins/super-forms/uploads/php/files/b78db9ef39ba2d49e84a116f87b9a47c/sukiseguzefuxakin.pdfIn PDF document text
    • http://sinostandards.net/upload/files/gimodawuliwafibuserobu.pdfIn PDF document text
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/pppkvl3cigrf7n1tc7796qu3hf/tijilemutosipite.pdfIn PDF document text
    • http://warraichmeats.com/wp-content/plugins/formcraft/file-upload/server/content/files/160859a7c82930---nexagedimulej.pdfIn PDF document text
    • https://brahmagnanam.org/fck_uploads/file/67879240202.pdfIn PDF document text
    • http://ctyrkolky-gamax.cz/data/dokumenty/80028796617.pdfIn PDF document text
    • https://cambodiaangkorhomestay.com/userfiles/file/pijetugejala.pdfIn PDF document text
    • http://aliceinformaticasrl.com/user/pages/zitunoze.pdfIn PDF document text
    • http://bukharaatlanta.com/sites/default/files/file/nonozadirolem.pdfIn PDF document text
    • https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/pf08qua7re2df1ii45ujuc5336/3989765154.pdfIn PDF document text
    • http://goghepcacloai.com/media/ftp/file/57920782779.pdfIn PDF document text
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/c47adf721927afdda0e3450716785b76/40964582914.pdfIn PDF document text
    • http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/623299d62f1f15c28be7a5db529e0e4c/80670103706.pdfIn PDF document text
    • http://cokhiminhhien.com/media/ftp/file/87578677265.pdfIn PDF document text
    • http://spy-military-labs.com/userfiles/file/mabamaneno.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/cg97a8mh7hsf6a07qkrgnqbbm5/xofig.pdfIn PDF document text
    • https://ecomassage.pt/wp-content/plugins/super-forms/uploads/php/files/14rjg77d65l5gi71sv8k4m97oa/kozun.pdfIn PDF document text
    • http://ruilong-ironwork.com/CKEdit/upload/files/98473485687.pdfIn PDF document text
    • http://sake2metustin.com/uploads/files/65745221422.pdfIn PDF document text
    • http://sazjah.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092823f023fe---jisoninafun.pdfIn PDF document text
    • http://www.stallionreadymix.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160f0077f236e1---bimazutidememu.pdfIn PDF document text
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ceedc9abbf3---kifenolafaruri.pdfIn PDF document text
    • http://dancedynamicsla.com/clients/38740/File/89089342008.pdfIn PDF document text
    • http://rama-sp.com/rama/webroot/js/ckfinder/userfiles/files/vokugalidaf.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=fiat+500x+2016+manualPDF 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_off0000e234.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE234 10524 bytes
SHA-256: 56a5c1a1271ee9ae9e348c34dc4667f9dfca90db68b95652022cd7d7a4974844
font_01_sfnt_off0000fa42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA42 18444 bytes
SHA-256: 16b19cfa55cc27dca48adb3ad356f26bfe821bdf553a300bfc1174f2a91c78da
font_02_sfnt_off00012ab0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AB0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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