Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8e22b83778b4b4d…

MALICIOUS

PDF

93.8 KB Created: 2021-07-15 18:47:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 721aae9953810bd67035b131c5b7de42 SHA-1: 4792184ec77a8823df7dc41b15bf2a408cc127a4 SHA-256: a8e22b83778b4b4db3c33cae4d4e84ee40f74895cf3684d24bef62fdd184c760
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a high-severity PDF_RANDOM_URL_LINK and ML_NYX_PDF_MALICIOUS. It contains a large number of embedded links, many pointing to compromised WordPress sites, suggesting a phishing or malware distribution campaign. The ClamAV detection of 'Pdf.Phishing.Trojan' further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://dungcuruamui.com/wp-content/plugins/super-forms/uploads/php/files/ur6anf22ga4ct7nedtuld77vt1/95597018760.pdf In PDF document text
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/7r5nlujmf00fsnthjribtm47r6/55485262285.pdfIn PDF document text
    • http://frankslawfirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/nukidavipufoxazosonir.pdfIn PDF document text
    • https://donnasalon.ru/wp-content/plugins/super-forms/uploads/php/files/e276d9786bac2cd0b1d3efed20cd998f/luwirujizorosanadavone.pdfIn PDF document text
    • https://criteriacambio.com.br/wp-content/plugins/super-forms/uploads/php/files/go40e4rnmun2gspp5bfdr3p3i3/difuzeviretesodomedobiga.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/160744a3a61e1d---37787031635.pdfIn PDF document text
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/b9b9bcbabacc5481285246549b1349bf/xodoziniv.pdfIn PDF document text
    • http://sciencevier.com/wp-content/plugins/formcraft/file-upload/server/content/files/160712a95a8e8f---97719499410.pdfIn PDF document text
    • http://brcassociati.com/userfiles/files/96979546432.pdfIn PDF document text
    • http://elmbbq.com/uploads/files/75291273552.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/uugnogk88ejlhvtdiupe9en057/wosanoxajalozanufido.pdfIn PDF document text
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084cbc4ae608---93107591752.pdfIn PDF document text
    • http://danburyhighclassof1961.com/clients/b/b4/b42d7d7907ff1a67dd6fd366dd3c6775/File/37598726448.pdfIn PDF document text
    • https://yukkumpulgroup1.com/contents//files/2494419912.pdfIn PDF document text
    • http://allaboutdowney.com/userimages/norujesejuz.pdfIn PDF document text
    • https://amblamy.ee/upload/file/xawoxiganoxawalonupeva.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/fot7sue6c6ok2n4cq3qnaf6097/robizisux.pdfIn PDF document text
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095e34b02f17---73077754180.pdfIn PDF document text
    • https://wlao.on.ca/wp-content/plugins/super-forms/uploads/php/files/55f673e44710c33cad46a90daedaacd8/tisajebi.pdfIn PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e5096d7062---35791137182.pdfIn PDF document text
    • https://grandplaza.bg/uploads/assets/file/nugejojafifuvapujadupo.pdfIn PDF document text
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a73d00c661f---giremusesukegakibuxa.pdfIn PDF document text
    • https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/cja8ig4e0rqbg1n71bhqdu7siv/magowumozawafaju.pdfIn PDF document text
    • https://sellos-mecanicos.com/wp-content/plugins/super-forms/uploads/php/files/0c21d6468d3fa3573b9fcd3c474133f4/xozinibadewoleroziwaj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=billy+gilmour+fifa+21PDF 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_off00010b68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B68 17908 bytes
SHA-256: 24dc4a865956ebd34b670328956cb9d3ca6513bff77115021c4214faf603d7aa
font_01_sfnt_off000139dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139DD 10492 bytes
SHA-256: 9e18ba7e5d20242c5f74beafad6b447b671942d090fa92cf9729ae7febf67dc4
font_02_sfnt_off000151da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x151DA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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